arm64: Early CPU feature override, and applications to VHE, BTI and PAuth
Subsystems (4)
Marc Zyngier
maintainerv7 cover arm64: Early CPU feature override, and applications to VHE, BTI and PAuth
It recently came to light that there is a need to be able to override some CPU features very early on, before the kernel is fully up and running. The reasons for this range from specific feature support (such as using Protected KVM on VHE HW, which is the main motivation for this work) to errata workaround (a feature is broken on a CPU and needs to be turned off, or rather not enabled).
This series tries to offer a limited framework for this kind of problems, by allowing a set of options to be passed on the command-line and altering the feature set that the cpufeature subsystem exposes to the rest of the kernel. Note that this doesn't change anything for code that directly uses the CPU ID registers.
The series completely changes the way a VHE-capable system boots, by *always* booting non-VHE first, and then upgrading to VHE when deemed capable. Although it sounds scary, this is actually simple to implement (and I wish I had done that five years ago). The "upgrade to VHE" path is then conditioned on the VHE feature not being disabled from the command-line.
Said command-line parsing borrows a lot from the kaslr code, and subsequently allows the "nokaslr" option to be moved to the new infrastructure (though it all looks a bit... odd).
Further patches now add support for disabling BTI and PAuth, the latter being based on an initial series by Srinivas Ramana[0]. There is some ongoing discussions about being able to disable MTE, but no clear resolution on that subject yet
WARNING: this series breaks Apple M1 badly, as it is stuck in VHE mode. The last patch in this series papers over the problem, but it *isn't* a candidate for merging yet.
This has been tested on multiple VHE and non-VHE systems.
Branch available at [7].
* From v6 [6]:
- Greatly simplify SPE setup with VHE
- Simplify option parsing by reusing some of the helpers user by parse_args(). The whole function cannot be used though, as it does things that can't be done at the point where we parse the overrides.
- Add a patch allowing M1 CPUs to boot. This patch shouldn't be merged until we decide to support this non-architectural behaviour.
* From v5 [5]:
- Turn most __initdata into __initconst
- Ensure that all strings are part of the __initconst section. This is a bit ugly, but saves memory once up and running
- Make overrides __ro_after_init
- Change the command-line parsing so that the same feature can be overridden multiple times, with the expected left-to-right parsing order being respected
- Handle all space-like characters as option delimiters
- Collected Acks, RBs and TBs
* From v4 [4]:
- Documentation fixes
- Moved the val/mask pair into a arm64_ftr_override structure, leading to simpler code
- All arm64_ftr_reg now have a default override, which simplifies the code a bit further
- Dropped some of the "const" attributes
- Renamed init_shadow_regs() to init_feature_override()
- Renamed struct reg_desc to struct ftr_set_desc
- Refactored command-line parsing
- Simplified handling of VHE being disabled on the cmdline
- Turn EL1 S1 MMU off on switch to VHE
- HVC_VHE_RESTART now returns an error code on failure
- Added missing asmlinkage and dummy prototypes
- Collected Acks and RBs from David, Catalin and Suzuki
* From v3 [3]:
- Fixed the VHE_RESTART stub (duh!)
- Switched to using arm64_ftr_safe_value() instead of the user provided value
- Per-feature override warning
* From v2 [2]:
- Simplify the VHE_RESTART stub
- Fixed a number of spelling mistakes, and hopefully introduced a few more
- Override features in __read_sysreg_by_encoding()
- Allow both BTI and PAuth to be overridden on the command line
- Rebased on -rc3
* From v1 [1]:
- Fix SPE init on VHE when EL2 doesn't own SPE
- Fix re-init when KASLR is used
- Handle the resume path
- Rebased to 5.11-rc2
[0] https://lore.kernel.org/r/[email protected]
[1] https://lore.kernel.org/r/[email protected]
[2] https://lore.kernel.org/r/[email protected]
[3] https://lore.kernel.org/r/[email protected]
[4] https://lore.kernel.org/r/[email protected]
[5] https://lore.kernel.org/r/[email protected]
[6] https://lore.kernel.org/r/[email protected]
[7] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=hack/arm64-early-cpufeature
Marc Zyngier (22):
arm64: Fix labels in el2_setup macros
arm64: Fix outdated TCR setup comment
arm64: Turn the MMU-on sequence into a macro
arm64: Provide an 'upgrade to VHE' stub hypercall
arm64: Initialise as nVHE before switching to VHE
arm64: Drop early setting of MDSCR_EL2.TPMS
arm64: Move VHE-specific SPE setup to mutate_to_vhe()
arm64: Simplify init_el2_state to be non-VHE only
arm64: Move SCTLR_EL1 initialisation to EL-agnostic code
arm64: cpufeature: Add global feature override facility
arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding()
arm64: Extract early FDT mapping from kaslr_early_init()
arm64: cpufeature: Add an early command-line cpufeature override
facility
arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command
line
arm64: Honor VHE being disabled from the command-line
arm64: Add an aliasing facility for the idreg override
arm64: Make kvm-arm.mode={nvhe, protected} an alias of
id_aa64mmfr1.vh=0
KVM: arm64: Document HVC_VHE_RESTART stub hypercall
arm64: Move "nokaslr" over to the early cpufeature infrastructure
arm64: cpufeatures: Allow disabling of BTI from the command-line
arm64: cpufeatures: Allow disabling of Pointer Auth from the
command-line
[DO NOT MERGE] arm64: Cope with CPUs stuck in VHE mode
Srinivas Ramana (1):
arm64: Defer enabling pointer authentication on boot core
.../admin-guide/kernel-parameters.txt | 9 + Documentation/virt/kvm/arm/hyp-abi.rst | 9 + arch/arm64/include/asm/assembler.h | 17 ++ arch/arm64/include/asm/cpufeature.h | 11 + arch/arm64/include/asm/el2_setup.h | 60 ++--- arch/arm64/include/asm/pointer_auth.h | 10 + arch/arm64/include/asm/setup.h | 11 + arch/arm64/include/asm/stackprotector.h | 1 + arch/arm64/include/asm/virt.h | 7 +- arch/arm64/kernel/Makefile | 2 +- arch/arm64/kernel/asm-offsets.c | 3 + arch/arm64/kernel/cpufeature.c | 73 +++++- arch/arm64/kernel/head.S | 94 +++----- arch/arm64/kernel/hyp-stub.S | 141 +++++++++++- arch/arm64/kernel/idreg-override.c | 216 ++++++++++++++++++ arch/arm64/kernel/kaslr.c | 43 +--- arch/arm64/kernel/setup.c | 15 ++ arch/arm64/kernel/sleep.S | 1 + arch/arm64/kvm/arm.c | 3 + arch/arm64/kvm/hyp/nvhe/hyp-init.S | 2 +- arch/arm64/mm/mmu.c | 2 +- arch/arm64/mm/proc.S | 16 +- 22 files changed, 576 insertions(+), 170 deletions(-) create mode 100644 arch/arm64/include/asm/setup.h create mode 100644 arch/arm64/kernel/idreg-override.c
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2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 1/23 arm64: Fix labels in el2_setup macros
If someone happens to write the following code:
b 1f init_el2_state vhe 1: [...]
they will be in for a long debugging session, as the label "1f" will be resolved *inside* the init_el2_state macro instead of after it. Not really what one expects.
Instead, rewite the EL2 setup macros to use unambiguous labels, thanks to the usual macro counter trick.
--- arch/arm64/include/asm/el2_setup.h | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-)
arch/arm64/include/asm/el2_setup.h +12 -12
@@ -45,24 +45,24 @@mrs x1, id_aa64dfr0_el1 sbfx x0, x1, #ID_AA64DFR0_PMUVER_SHIFT, #4 cmp x0, #1 - b.lt 1f // Skip if no PMU present + b.lt .Lskip_pmu_\@ // Skip if no PMU present mrs x0, pmcr_el0 // Disable debug access traps ubfx x0, x0, #11, #5 // to EL2 and allow access to -1: +.Lskip_pmu_\@: csel x2, xzr, x0, lt // all PMU counters from EL1/* Statistical profiling */ ubfx x0, x1, #ID_AA64DFR0_PMSVER_SHIFT, #4 - cbz x0, 3f // Skip if SPE not present + cbz x0, .Lskip_spe_\@ // Skip if SPE not present .ifeqs "\mode", "nvhe" mrs_s x0, SYS_PMBIDR_EL1 // If SPE available at EL2, and x0, x0, #(1 << SYS_PMBIDR_EL1_P_SHIFT) - cbnz x0, 2f // then permit sampling of physical + cbnz x0, .Lskip_spe_el2_\@ // then permit sampling of physical mov x0, #(1 << SYS_PMSCR_EL2_PCT_SHIFT | \ 1 << SYS_PMSCR_EL2_PA_SHIFT) msr_s SYS_PMSCR_EL2, x0 // addresses and physical counter -2: +.Lskip_spe_el2_\@: mov x0, #(MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT) orr x2, x2, x0 // If we don't have VHE, then// use EL1&0 translation.
@@ -71,7 +71,7 @@// and disable access from EL1 .endif -3: +.Lskip_spe_\@:msr mdcr_el2, x2// Configure debug traps .endm
@@ -79,9 +79,9 @@ .macro __init_el2_lormrs x1, id_aa64mmfr1_el1 ubfx x0, x1, #ID_AA64MMFR1_LOR_SHIFT, 4 - cbz x0, 1f + cbz x0, .Lskip_lor_\@ msr_s SYS_LORC_EL1, xzr -1: +.Lskip_lor_\@: .endm/* Stage-2 translation */
@@ -93,7 +93,7 @@ .macro __init_el2_gicv3mrs x0, id_aa64pfr0_el1 ubfx x0, x0, #ID_AA64PFR0_GIC_SHIFT, #4 - cbz x0, 1f + cbz x0, .Lskip_gicv3_\@ mrs_s x0, SYS_ICC_SRE_EL2 orr x0, x0, #ICC_SRE_EL2_SRE // Set ICC_SRE_EL2.SRE==1
@@ -103,7 +103,7 @@mrs_s x0,SYS_ICC_SRE_EL2 // Read SRE back, tbz x0, #0, 1f // and check that it sticks msr_s SYS_ICH_HCR_EL2, xzr // Reset ICC_HCR_EL2 to defaults -1: +.Lskip_gicv3_\@: .endm .macro __init_el2_hstr
@@ -128,14 +128,14 @@ .macro __init_el2_nvhe_svemrs x1, id_aa64pfr0_el1 ubfx x1, x1, #ID_AA64PFR0_SVE_SHIFT, #4 - cbz x1, 1f + cbz x1, .Lskip_sve_\@ bic x0, x0, #CPTR_EL2_TZ // Also disable SVE traps msr cptr_el2, x0 // Disable copro. traps to EL2 isb mov x1, #ZCR_ELx_LEN_MASK // SVE: Enable full vector msr_s SYS_ZCR_EL2, x1 // length for EL1. -1: +.Lskip_sve_\@: .endm .macro __init_el2_nvhe_prepare_eret
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2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 2/23 arm64: Fix outdated TCR setup comment
In reply to Marc ZyngierThe arm64 kernel has long be able to use more than 39bit VAs. Since day one, actually. Let's rewrite the offending comment.
--- arch/arm64/mm/proc.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
arch/arm64/mm/proc.S +2 -2
@@ -464,8 +464,8 @@ SYM_FUNC_START(__cpu_setup) #endif msr mair_el1, x5 /* - * Set/prepare TCR and TTBR. We use 512GB (39-bit) address range for - * both user and kernel. + * Set/prepare TCR and TTBR. TCR_EL1.T1SZ gets further + * adjusted if the kernel is compiled with 52bit VA support. */ mov_q x10, TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \ TCR_TG_FLAGS | TCR_KASLR_FLAGS | TCR_ASID16 | \
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2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 3/23 arm64: Turn the MMU-on sequence into a macro
In reply to Marc ZyngierTurning the MMU on is a popular sport in the arm64 kernel, and we do it more than once, or even twice. As we are about to add even more, let's turn it into a macro.
No expected functional change.
--- arch/arm64/include/asm/assembler.h | 17 +++++++++++++++++ arch/arm64/kernel/head.S | 19 ++++--------------- arch/arm64/mm/proc.S | 12 +----------- 3 files changed, 22 insertions(+), 26 deletions(-)
arch/arm64/include/asm/assembler.h +17 -0
@@ -675,6 +675,23 @@ USER(\label, ic ivau, \tmp2) // invalidate I line PoU .endif .endm +/* + * Set SCTLR_EL1 to the passed value, and invalidate the local icache + * in the process. This is called when setting the MMU on. + */ +.macro set_sctlr_el1, reg + msr sctlr_el1, \reg + isb + /* + * Invalidate the local I-cache so that any instructions fetched + * speculatively from the PoC are discarded, since they may have + * been dynamically patched at the PoU. + */ + ic iallu + dsb nsh + isb +.endm +/* * Check whether to yield to another runnable task from kernel mode NEON code * (which runs with preemption disabled).
arch/arm64/kernel/head.S +4 -15
@@ -703,16 +703,9 @@ SYM_FUNC_START(__enable_mmu) offset_ttbr1 x1, x3 msr ttbr1_el1, x1 // load TTBR1 isb - msr sctlr_el1, x0 - isb - /* - * Invalidate the local I-cache so that any instructions fetched - * speculatively from the PoC are discarded, since they may have - * been dynamically patched at the PoU. - */ - ic iallu - dsb nsh - isb + + set_sctlr_el1 x0 + ret SYM_FUNC_END(__enable_mmu)
@@ -883,11 +876,7 @@ SYM_FUNC_START_LOCAL(__primary_switch) tlbi vmalle1 // Remove any stale TLB entries dsb nsh - msr sctlr_el1, x19 // re-enable the MMU - isb - ic iallu // flush instructions fetched - dsb nsh // via old mapping - isb + set_sctlr_el1 x19 // re-enable the MMU bl __relocate_kernel #endif
arch/arm64/mm/proc.S +1 -11
@@ -291,17 +291,7 @@ skip_pgd: /* We're done: fire up the MMU again */ mrs x17, sctlr_el1 orr x17, x17, #SCTLR_ELx_M - msr sctlr_el1, x17 - isb - - /* - * Invalidate the local I-cache so that any instructions fetched - * speculatively from the PoC are discarded, since they may have - * been dynamically patched at the PoU. - */ - ic iallu - dsb nsh - isb + set_sctlr_el1 x17 /* Set the flag to zero to indicate that we're all done */ str wzr, [flag_ptr]
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2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 4/23 arm64: Provide an 'upgrade to VHE' stub hypercall
In reply to Marc ZyngierAs we are about to change the way a VHE system boots, let's provide the core helper, in the form of a stub hypercall that enables VHE and replicates the full EL1 context at EL2, thanks to EL1 and VHE-EL2 being extremely similar.
On exception return, the kernel carries on at EL2. Fancy!
Nothing calls this new hypercall yet, so no functional change.
--- arch/arm64/include/asm/virt.h | 7 +++- arch/arm64/kernel/hyp-stub.S | 76 ++++++++++++++++++++++++++++++++++- 2 files changed, 80 insertions(+), 3 deletions(-)
arch/arm64/include/asm/virt.h +6 -1
@@ -35,8 +35,13 @@*/ #define HVC_RESET_VECTORS 2 +/* +* HVC_VHE_RESTART - Upgrade the CPU from EL1 to EL2, if possible +*/ +#define HVC_VHE_RESTART 3 +/* Max number of HYP stub hypercalls */ -#define HVC_STUB_HCALL_NR 3 +#define HVC_STUB_HCALL_NR 4/* Error returned when an invalid stub number is passed into x0 */ #define HVC_STUB_ERR 0xbadca11
arch/arm64/kernel/hyp-stub.S +74 -2
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2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 5/23 arm64: Initialise as nVHE before switching to VHE
In reply to Marc ZyngierAs we are aiming to be able to control whether we enable VHE or not, let's always drop down to EL1 first, and only then upgrade to VHE if at all possible.
This means that if the kernel is booted at EL2, we always start with a nVHE init, drop to EL1 to initialise the the kernel, and only then upgrade the kernel EL to EL2 if possible (the process is obviously shortened for secondary CPUs).
The resume path is handled similarly to a secondary CPU boot.
--- arch/arm64/kernel/head.S | 38 ++---------------------------------- arch/arm64/kernel/hyp-stub.S | 24 +++++++++++++++++++++++ arch/arm64/kernel/sleep.S | 1 + 3 files changed, 27 insertions(+), 36 deletions(-)
arch/arm64/kernel/head.S +2 -36
@@ -433,6 +433,7 @@ SYM_FUNC_START_LOCAL(__primary_switched) bl __pi_memset dsb ishst // Make zero page visible to PTW + bl switch_to_vhe #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) bl kasan_early_init #endif
@@ -493,42 +494,6 @@ SYM_INNER_LABEL(init_el1, SYM_L_LOCAL) eret SYM_INNER_LABEL(init_el2, SYM_L_LOCAL) -#ifdef CONFIG_ARM64_VHE - /* - * Check for VHE being present. x2 being non-zero indicates that we - * do have VHE, and that the kernel is intended to run at EL2. - */ - mrs x2, id_aa64mmfr1_el1 - ubfx x2, x2, #ID_AA64MMFR1_VHE_SHIFT, #4 -#else - mov x2, xzr -#endif - cbz x2, init_el2_nvhe - - /* - * When VHE _is_ in use, EL1 will not be used in the host and - * requires no configuration, and all non-hyp-specific EL2 setup - * will be done via the _EL1 system register aliases in __cpu_setup. - */ - mov_q x0, HCR_HOST_VHE_FLAGS - msr hcr_el2, x0 - isb - - init_el2_state vhe - - isb - - mov_q x0, INIT_PSTATE_EL2 - msr spsr_el2, x0 - msr elr_el2, lr - mov w0, #BOOT_CPU_MODE_EL2 - eret - -SYM_INNER_LABEL(init_el2_nvhe, SYM_L_LOCAL) - /* - * When VHE is not in use, early init of EL2 and EL1 needs to be - * done here. - */ mov_q x0, INIT_SCTLR_EL1_MMU_OFF msr sctlr_el1, x0
@@ -623,6 +588,7 @@ SYM_FUNC_START_LOCAL(secondary_startup) /* * Common entry point for secondary CPUs. */ + bl switch_to_vhe bl __cpu_secondary_check52bitva bl __cpu_setup // initialise processor adrp x1, swapper_pg_dir
arch/arm64/kernel/hyp-stub.S +24 -0
@@ -190,3 +190,27 @@ SYM_FUNC_START(__hyp_reset_vectors) hvc #0 ret SYM_FUNC_END(__hyp_reset_vectors) + +/* + * Entry point to switch to VHE if deemed capable + */ +SYM_FUNC_START(switch_to_vhe) +#ifdef CONFIG_ARM64_VHE + // Need to have booted at EL2 + adr_l x1, __boot_cpu_mode + ldr w0, [x1] + cmp w0, #BOOT_CPU_MODE_EL2 + b.ne 1f + + // and still be at EL1 + mrs x0, CurrentEL + cmp x0, #CurrentEL_EL1 + b.ne 1f + + // Turn the world upside down + mov x0, #HVC_VHE_RESTART + hvc #0 +1: +#endif + ret +SYM_FUNC_END(switch_to_vhe)
arch/arm64/kernel/sleep.S +1 -0
@@ -100,6 +100,7 @@ SYM_FUNC_END(__cpu_suspend_enter) .pushsection ".idmap.text", "awx" SYM_CODE_START(cpu_resume) bl init_kernel_el + bl switch_to_vhe bl __cpu_setup /* enable the MMU early - so we can access sleep_save_stash by va */ adrp x1, swapper_pg_dir
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2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 6/23 arm64: Drop early setting of MDSCR_EL2.TPMS
In reply to Marc ZyngierWhen running VHE, we set MDSCR_EL2.TPMS very early on to force the trapping of EL1 SPE accesses to EL2.
However:
- we are running with HCR_EL2.{E2H,TGE}={1,1}, meaning that there is no EL1 to trap from
- before entering a guest, we call kvm_arm_setup_debug(), which sets MDCR_EL2_TPMS in the per-vcpu shadow mdscr_el2, which gets applied on entry by __activate_traps_common().
The early setting of MDSCR_EL2.TPMS is therefore useless and can be dropped.
--- arch/arm64/include/asm/el2_setup.h | 3 --- 1 file changed, 3 deletions(-)
arch/arm64/include/asm/el2_setup.h +0 -3
@@ -66,9 +66,6 @@ mov x0, #(MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT) orr x2, x2, x0 // If we don't have VHE, then// use EL1&0 translation. -.else - orr x2, x2, #MDCR_EL2_TPMS // For VHE, use EL2 translation - // and disable access from EL1 .endif .Lskip_spe_\@:
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2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 7/23 arm64: Move VHE-specific SPE setup to mutate_to_vhe()
In reply to Marc ZyngierThere isn't much that a VHE kernel needs on top of whatever has been done for nVHE, so let's move the little we need to the VHE stub (the SPE setup), and drop the init_el2_state macro.
No expected functional change.
--- arch/arm64/kernel/hyp-stub.S | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
arch/arm64/kernel/hyp-stub.S +5 -3
@@ -92,9 +92,6 @@ SYM_CODE_START_LOCAL(mutate_to_vhe) msr hcr_el2, x0 isb - // Doesn't do much on VHE, but still, worth a shot - init_el2_state vhe - // Use the EL1 allocated stack, per-cpu offset mrs x0, sp_el1 mov sp, x0
@@ -107,6 +104,11 @@ SYM_CODE_START_LOCAL(mutate_to_vhe) mrs_s x0, SYS_VBAR_EL12 msr vbar_el1, x0 + // Use EL2 translations for SPE and disable access from EL1 + mrs x0, mdcr_el2 + bic x0, x0, #(MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT) + msr mdcr_el2, x0 + // Transfer the MM state from EL1 to EL2 mrs_s x0, SYS_TCR_EL12 msr tcr_el1, x0
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2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 8/23 arm64: Simplify init_el2_state to be non-VHE only
In reply to Marc ZyngierAs init_el2_state is now nVHE only, let's simplify it and drop the VHE setup.
--- arch/arm64/include/asm/el2_setup.h | 33 ++++++++---------------------- arch/arm64/kernel/head.S | 2 +- arch/arm64/kvm/hyp/nvhe/hyp-init.S | 2 +- 3 files changed, 10 insertions(+), 27 deletions(-)
arch/arm64/include/asm/el2_setup.h +8 -25
@@ -32,16 +32,14 @@* to transparently mess with the EL0 bits via CNTKCTL_EL1 access in * EL2. */ -.macro __init_el2_timers mode -.ifeqs "\mode", "nvhe" +.macro __init_el2_timersmrs x0, cnthctl_el2 orr x0, x0, #3 // Enable EL1 physical timers msr cnthctl_el2, x0 -.endif msr cntvoff_el2, xzr // Clear virtual offset .endm -.macro __init_el2_debug mode +.macro __init_el2_debug mrs x1, id_aa64dfr0_el1 sbfx x0, x1, #ID_AA64DFR0_PMUVER_SHIFT, #4 cmp x0, #1
@@ -55,7 +53,6 @@ ubfx x0, x1, #ID_AA64DFR0_PMSVER_SHIFT, #4 cbz x0, .Lskip_spe_\@ // Skip if SPE not present -.ifeqs "\mode", "nvhe" mrs_s x0, SYS_PMBIDR_EL1 // If SPE available at EL2, and x0, x0, #(1 << SYS_PMBIDR_EL1_P_SHIFT) cbnz x0, .Lskip_spe_el2_\@ // then permit sampling of physical
@@ -66,7 +63,6 @@ mov x0, #(MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT) orr x2, x2, x0 // If we don't have VHE, then// use EL1&0 translation. -.endif .Lskip_spe_\@: msr mdcr_el2, x2 // Configure debug traps
@@ -142,37 +138,24 @@/** * Initialize EL2 registers to sane values. This should be called early on all -* cores that were booted in EL2. +* cores that were booted in EL2. Note that everything gets initialised as +* if VHE was not evailable. The kernel context will be upgraded to VHE +* if possible later on in the boot process * * Regs: x0, x1 and x2 are clobbered. */ -.macro init_el2_state mode -.ifnes "\mode", "vhe" -.ifnes "\mode", "nvhe" -.error "Invalid 'mode' argument" -.endif -.endif - +.macro init_el2_state__init_el2_sctlr - __init_el2_timers \mode - __init_el2_debug \mode + __init_el2_timers +__init_el2_debug __init_el2_lor__init_el2_stage2 __init_el2_gicv3__init_el2_hstr - - /* - * When VHE is not in use, early init of EL2 needs to be done here. - * When VHE _is_ in use, EL1 will not be used in the host and - * requires no configuration, and all non-hyp-specific EL2 setup - * will be done via the _EL1 system register aliases in __cpu_setup. - */ -.ifeqs "\mode", "nvhe" __init_el2_nvhe_idregs__init_el2_nvhe_cptr __init_el2_nvhe_sve __init_el2_nvhe_prepare_eret -.endif .endm#endif /* __ARM_KVM_INIT_H__ */
arch/arm64/kernel/head.S +1 -1
@@ -501,7 +501,7 @@ SYM_INNER_LABEL(init_el2, SYM_L_LOCAL) msr hcr_el2, x0 isb - init_el2_state nvhe + init_el2_state /* Hypervisor stub */ adr_l x0, __hyp_stub_vectors
arch/arm64/kvm/hyp/nvhe/hyp-init.S +1 -1
@@ -189,7 +189,7 @@ SYM_CODE_START_LOCAL(__kvm_hyp_init_cpu) 2: msr SPsel, #1 // We want to use SP_EL{1,2} /* Initialize EL2 CPU state to sane values. */ - init_el2_state nvhe // Clobbers x0..x2 + init_el2_state // Clobbers x0..x2 /* Enable MMU, set vectors and stack. */ mov x0, x28
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 9/23 arm64: Move SCTLR_EL1 initialisation to EL-agnostic code
In reply to Marc ZyngierWe can now move the initial SCTLR_EL1 setup to be used for both EL1 and EL2 setup.
--- arch/arm64/kernel/head.S | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)
arch/arm64/kernel/head.S +3 -5
@@ -479,13 +479,14 @@ EXPORT_SYMBOL(kimage_vaddr) * booted in EL1 or EL2 respectively. */ SYM_FUNC_START(init_kernel_el) + mov_q x0, INIT_SCTLR_EL1_MMU_OFF + msr sctlr_el1, x0 + mrs x0, CurrentEL cmp x0, #CurrentEL_EL2 b.eq init_el2 SYM_INNER_LABEL(init_el1, SYM_L_LOCAL) - mov_q x0, INIT_SCTLR_EL1_MMU_OFF - msr sctlr_el1, x0 isb mov_q x0, INIT_PSTATE_EL1 msr spsr_el1, x0
@@ -494,9 +495,6 @@ SYM_INNER_LABEL(init_el1, SYM_L_LOCAL) eret SYM_INNER_LABEL(init_el2, SYM_L_LOCAL) - mov_q x0, INIT_SCTLR_EL1_MMU_OFF - msr sctlr_el1, x0 - mov_q x0, HCR_HOST_NVHE_FLAGS msr hcr_el2, x0 isb
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 10/23 arm64: cpufeature: Add global feature override facility
In reply to Marc ZyngierAdd a facility to globally override a feature, no matter what the HW says. Yes, this sounds dangerous, but we do respect the "safe" value for a given feature. This doesn't mean the user doesn't need to know what they are doing.
Nothing uses this yet, so we are pretty safe. For now.
--- arch/arm64/include/asm/cpufeature.h | 6 ++++ arch/arm64/kernel/cpufeature.c | 45 +++++++++++++++++++++++++---- 2 files changed, 45 insertions(+), 6 deletions(-)
arch/arm64/include/asm/cpufeature.h +6 -0
@@ -63,6 +63,11 @@ struct arm64_ftr_bits {s64 safe_val;/* safe value for FTR_EXACT features */ }; +struct arm64_ftr_override { +u64 val; +u64 mask; +}; +/* * @arm64_ftr_reg - Feature register * @strict_mask Bits which should match across all CPUs for sanity.
@@ -74,6 +79,7 @@ struct arm64_ftr_reg {u64 user_mask;u64 sys_val;u64 user_val; +struct arm64_ftr_override *override;const struct arm64_ftr_bits *ftr_bits; };
arch/arm64/kernel/cpufeature.c +39 -6
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Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 11/23 arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding()
In reply to Marc Zyngier__read_sysreg_by_encoding() is used by a bunch of cpufeature helpers, which should take the feature override into account. Let's do that.
For a good measure (and because we are likely to need to further down the line), make this helper available to the rest of the non-modular kernel.
Code that needs to know the *real* features of a CPU can still use read_sysreg_s(), and find the bare, ugly truth.
--- arch/arm64/include/asm/cpufeature.h | 1 + arch/arm64/kernel/cpufeature.c | 15 +++++++++++++-- 2 files changed, 14 insertions(+), 2 deletions(-)
arch/arm64/include/asm/cpufeature.h +1 -0
@@ -606,6 +606,7 @@ void __init setup_cpu_features(void);void check_local_cpu_capabilities (void );u64 read_sanitised_ftr_reg (u32 id); +u64 __read_sysreg_by_encoding (u32 sys_id);static inline bool cpu_supports_mixed_endian_el0 (void ) {
arch/arm64/kernel/cpufeature.c +13 -2
@@ -1148,14 +1148,17 @@ u64 read_sanitised_ftr_reg(u32 id)EXPORT_SYMBOL_GPL (read_sanitised_ftr_reg);#define read_sysreg_case (r) \ - case r: return read_sysreg_s(r) + case r: val = read_sysreg_s(r); break;/* * __read_sysreg_by_encoding() - Used by a STARTING cpu before cpuinfo is populated. * Read the system register on the current CPU */ -static u64 __read_sysreg_by_encoding (u32 sys_id) +u64 __read_sysreg_by_encoding (u32 sys_id) { +struct arm64_ftr_reg *regp; +u64 val; +switch (sys_id) {read_sysreg_case (SYS_ID_PFR0_EL1 );read_sysreg_case (SYS_ID_PFR1_EL1 );
@@ -1198,6 +1201,14 @@ static u64 __read_sysreg_by_encoding(u32 sys_id)BUG ();return 0 ; } + + regp =get_arm64_ftr_reg (sys_id); +if (regp) { + val &= ~regp->override->mask; + val |= (regp->override->val & regp->override->mask); + } + +return val; }#include <linux/irqchip/arm-gic-v3.h>
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 12/23 arm64: Extract early FDT mapping from kaslr_early_init()
In reply to Marc ZyngierAs we want to parse more options very early in the kernel lifetime, let's always map the FDT early. This is achieved by moving that code out of kaslr_early_init().
No functionnal change expected.
--- arch/arm64/include/asm/setup.h | 11 +++++++++++ arch/arm64/kernel/head.S | 3 ++- arch/arm64/kernel/kaslr.c | 7 +++---- arch/arm64/kernel/setup.c | 15 +++++++++++++++ 4 files changed, 31 insertions(+), 5 deletions(-) create mode 100644 arch/arm64/include/asm/setup.h
arch/arm64/include/asm/setup.h new file +11 -0
@@ -0,0 +1,11 @@ +// SPDX-License-Identifier: GPL-2.0 + +#ifndef __ARM64_ASM_SETUP_H +#define __ARM64_ASM_SETUP_H + +#include <uapi/asm/setup.h> + +void *get_early_fdt_ptr (void ); +void early_fdt_map (u64 dt_phys); + +#endif
arch/arm64/kernel/head.S +2 -1
@@ -433,6 +433,8 @@ SYM_FUNC_START_LOCAL(__primary_switched) bl __pi_memset dsb ishst // Make zero page visible to PTW + mov x0, x21 // pass FDT address in x0 + bl early_fdt_map // Try mapping the FDT early bl switch_to_vhe #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) bl kasan_early_init
@@ -440,7 +442,6 @@ SYM_FUNC_START_LOCAL(__primary_switched) #ifdef CONFIG_RANDOMIZE_BASE tst x23, ~(MIN_KIMG_ALIGN - 1) // already running randomized? b.ne 0f - mov x0, x21 // pass FDT address in x0 bl kaslr_early_init // parse FDT for KASLR options cbz x0, 0f // KASLR disabled? just proceed orr x23, x23, x0 // record KASLR offset
arch/arm64/kernel/kaslr.c +3 -4
@@ -19,6 +19,7 @@#include <asm/memory.h> #include <asm/mmu.h> #include <asm/sections.h> +#include <asm/setup.h> enum kaslr_status {KASLR_ENABLED ,
@@ -92,12 +93,11 @@ static __init bool is_kaslr_disabled_cmdline(void *fdt)* containing function pointers) to be reinitialized, and zero-initialized * .bss variables will be reset to 0. */ -u64 __init kaslr_early_init (u64 dt_phys) +u64 __init kaslr_early_init (void ) {void *fdt;u64 seed, offset, mask, module_range;unsigned long raw; -int size;/* * Set a reasonable default for module_alloc_base in case
@@ -111,8 +111,7 @@ u64 __init kaslr_early_init(u64 dt_phys)* and proceed with KASLR disabled. We will make another * attempt at mapping the FDT in setup_machine() */ -early_fixmap_init (); - fdt =fixmap_remap_fdt (dt_phys, &size,PAGE_KERNEL ); + fdt =get_early_fdt_ptr ();if (!fdt) { kaslr_status =KASLR_DISABLED_FDT_REMAP ;return 0 ;
arch/arm64/kernel/setup.c +15 -0
@@ -168,6 +168,21 @@ static void __init smp_build_mpidr_hash(void)pr_warn ("Large number of MPIDR hash buckets detected\n" ); } +static void *early_fdt_ptr__initdata ; + +void __init *get_early_fdt_ptr (void ) +{ +return early_fdt_ptr; +} + +asmlinkage void __init early_fdt_map(u64 dt_phys) +{ +int fdt_size; + +early_fixmap_init (); + early_fdt_ptr =fixmap_remap_fdt (dt_phys, &fdt_size,PAGE_KERNEL ); +} +static void __init setup_machine_fdt (phys_addr_t dt_phys) {int size;
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 13/23 arm64: cpufeature: Add an early command-line cpufeature override facility
In reply to Marc ZyngierIn order to be able to override CPU features at boot time, let's add a command line parser that matches options of the form "cpureg.feature=value", and store the corresponding value into the override val/mask pair.
No features are currently defined, so no expected change in functionality.
--- arch/arm64/kernel/Makefile | 2 +- arch/arm64/kernel/head.S | 1 + arch/arm64/kernel/idreg-override.c | 150 +++++++++++++++++++++++++++++ 3 files changed, 152 insertions(+), 1 deletion(-) create mode 100644 arch/arm64/kernel/idreg-override.c
arch/arm64/kernel/Makefile +1 -1
@@ -17,7 +17,7 @@ obj-y := debug-monitors.o entry.o irq.o fpsimd.o \ return_address.o cpuinfo.o cpu_errata.o \ cpufeature.o alternative.o cacheinfo.o \ smp.o smp_spin_table.o topology.o smccc-call.o \ - syscall.o proton-pack.o + syscall.o proton-pack.o idreg-override.o targets += efi-entry.o
arch/arm64/kernel/head.S +1 -0
@@ -435,6 +435,7 @@ SYM_FUNC_START_LOCAL(__primary_switched) mov x0, x21 // pass FDT address in x0 bl early_fdt_map // Try mapping the FDT early + bl init_feature_override bl switch_to_vhe #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) bl kasan_early_init
arch/arm64/kernel/idreg-override.c new file +150 -0
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Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 14/23 arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line
In reply to Marc ZyngierAs we want to be able to disable VHE at runtime, let's match "id_aa64mmfr1.vh=" from the command line as an override. This doesn't have much effect yet as our boot code doesn't look at the cpufeature, but only at the HW registers.
--- arch/arm64/include/asm/cpufeature.h | 2 ++ arch/arm64/kernel/cpufeature.c | 5 ++++- arch/arm64/kernel/idreg-override.c | 11 +++++++++++ 3 files changed, 17 insertions(+), 1 deletion(-)
arch/arm64/include/asm/cpufeature.h +2 -0
@@ -818,6 +818,8 @@ static inline unsigned int get_vmid_bits(u64 mmfr1)return 8 ; } +extern struct arm64_ftr_override id_aa64mmfr1_override; +u32 get_kvm_ipa_limit (void );void dump_cpu_features (void );
arch/arm64/kernel/cpufeature.c +4 -1
@@ -557,6 +557,8 @@ static const struct arm64_ftr_bits ftr_raz[] = {#define ARM64_FTR_REG (id, table) ARM64_FTR_REG_OVERRIDE(id, table, &no_override) +struct arm64_ftr_override __ro_after_init id_aa64mmfr1_override; + static const struct __ftr_reg_entry { u32 sys_id; struct arm64_ftr_reg *reg;
@@ -604,7 +606,8 @@ static const struct __ftr_reg_entry {/* Op1 = 0, CRn = 0, CRm = 7 */ ARM64_FTR_REG (SYS_ID_AA64MMFR0_EL1 , ftr_id_aa64mmfr0), -ARM64_FTR_REG (SYS_ID_AA64MMFR1_EL1 , ftr_id_aa64mmfr1), +ARM64_FTR_REG_OVERRIDE (SYS_ID_AA64MMFR1_EL1 , ftr_id_aa64mmfr1, + &id_aa64mmfr1_override), ARM64_FTR_REG(SYS_ID_AA64MMFR2_EL1, ftr_id_aa64mmfr2),/* Op1 = 0, CRn = 1, CRm = 2 */
arch/arm64/kernel/idreg-override.c +11 -0
@@ -11,6 +11,7 @@#include <linux/libfdt.h> #include <asm/cacheflush.h> +#include <asm/cpufeature.h> #include <asm/setup.h> #define FTR_DESC_NAME_LEN 20
@@ -25,7 +26,17 @@ struct ftr_set_desc { } fields[]; }; +static const struct ftr_set_desc mmfr1__initconst = { + .name ="id_aa64mmfr1" , + .override = &id_aa64mmfr1_override, + .fields = { + {"vh" ,ID_AA64MMFR1_VHE_SHIFT }, + {} + }, +}; +static const struct ftr_set_desc *const regs[]__initconst = { + &mmfr1, }; static int __init find_field(const char *cmdline,
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 15/23 arm64: Honor VHE being disabled from the command-line
In reply to Marc ZyngierFinally we can check whether VHE is disabled on the command line, and not enable it if that's the user's wish.
--- arch/arm64/kernel/asm-offsets.c | 3 +++ arch/arm64/kernel/hyp-stub.S | 11 +++++++++++ 2 files changed, 14 insertions(+)
arch/arm64/kernel/asm-offsets.c +3 -0
@@ -99,6 +99,9 @@ int main(void)DEFINE (CPU_BOOT_STACK , offsetof(struct secondary_data , stack));DEFINE (CPU_BOOT_TASK , offsetof(struct secondary_data , task));BLANK (); +DEFINE (FTR_OVR_VAL_OFFSET , offsetof(struct arm64_ftr_override , val)); +DEFINE (FTR_OVR_MASK_OFFSET , offsetof(struct arm64_ftr_override , mask)); +BLANK ();#ifdef CONFIG_KVM DEFINE(VCPU_CONTEXT, offsetof(struct kvm_vcpu, arch.ctxt)); DEFINE(VCPU_FAULT_DISR, offsetof(struct kvm_vcpu, arch.fault.disr_el1));
arch/arm64/kernel/hyp-stub.S +11 -0
@@ -87,6 +87,17 @@ SYM_CODE_START_LOCAL(mutate_to_vhe) ubfx x1, x1, #ID_AA64MMFR1_VHE_SHIFT, #4 cbz x1, 1f + // Check whether VHE is disabled from the command line + adr_l x1, id_aa64mmfr1_override + ldr x2, [x1, FTR_OVR_VAL_OFFSET] + ldr x1, [x1, FTR_OVR_MASK_OFFSET] + ubfx x2, x2, #ID_AA64MMFR1_VHE_SHIFT, #4 + ubfx x1, x1, #ID_AA64MMFR1_VHE_SHIFT, #4 + cmp x1, xzr + and x2, x2, x1 + csinv x2, x2, xzr, ne + cbz x2, 1f + // Engage the VHE magic! mov_q x0, HCR_HOST_VHE_FLAGS msr hcr_el2, x0
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 16/23 arm64: Add an aliasing facility for the idreg override
In reply to Marc ZyngierIn order to map the override of idregs to options that a user can easily understand, let's introduce yet another option array, which maps an option to the corresponding idreg options.
--- arch/arm64/kernel/idreg-override.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-)
arch/arm64/kernel/idreg-override.c +14 -3
@@ -16,6 +16,8 @@#define FTR_DESC_NAME_LEN 20#define FTR_DESC_FIELD_LEN 10 +#define FTR_ALIAS_NAME_LEN 30 +#define FTR_ALIAS_OPTION_LEN 80struct ftr_set_desc {char name[FTR_DESC_NAME_LEN ];
@@ -39,6 +41,12 @@ static const struct ftr_set_desc * const regs[] __initconst = { &mmfr1, }; +static const struct { +char alias[FTR_ALIAS_NAME_LEN ]; +char feature[FTR_ALIAS_OPTION_LEN ]; +} aliases[]__initconst = { +}; +static int __init find_field (const char *cmdline,const struct ftr_set_desc *reg,int f,u64 *v) {
@@ -81,7 +89,7 @@ static void __init match_options(const char *cmdline) } } -static __init void __parse_cmdline (const char *cmdline) +static __init void __parse_cmdline (const char *cmdline,bool parse_aliases) { do { char buf[256];
@@ -105,6 +113,9 @@ static __init void __parse_cmdline(const char *cmdline)match_options (buf); +for (i =0 ; parse_aliases && i <ARRAY_SIZE (aliases); i++) +if (parameq (buf, aliases[i].alias)) +__parse_cmdline (aliases[i].feature, false); }while (1 ); }
@@ -127,14 +138,14 @@ static __init void parse_cmdline(void)if (!prop) goto out; -__parse_cmdline (prop); +__parse_cmdline (prop, true);if (!IS_ENABLED (CONFIG_CMDLINE_EXTEND ))return ; } out: -__parse_cmdline (CONFIG_CMDLINE ); +__parse_cmdline (CONFIG_CMDLINE , true); }/* Keep checkers quiet */
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 17/23 arm64: Make kvm-arm.mode={nvhe, protected} an alias of id_aa64mmfr1.vh=0
In reply to Marc ZyngierAdmitedly, passing id_aa64mmfr1.vh=0 on the command-line isn't that easy to understand, and it is likely that users would much prefer write "kvm-arm.mode=nvhe", or "...=protected".
So here you go. This has the added advantage that we can now always honor the "kvm-arm.mode=protected" option, even when booting on a VHE system.
--- Documentation/admin-guide/kernel-parameters.txt | 3 +++ arch/arm64/kernel/idreg-override.c | 2 ++ arch/arm64/kvm/arm.c | 3 +++ 3 files changed, 8 insertions(+)
Documentation/admin-guide/kernel-parameters.txt +3 -0
@@ -2257,6 +2257,9 @@ kvm-arm.mode= [KVM,ARM] Select one of KVM/arm64's modes of operation. + nvhe: Standard nVHE-based mode, without support for + protected guests. + protected: nVHE-based mode with support for guests whose state is kept private from the host. Not valid if the kernel is running in EL2.
arch/arm64/kernel/idreg-override.c +2 -0
@@ -45,6 +45,8 @@ static const struct {char alias[FTR_ALIAS_NAME_LEN ];char feature[FTR_ALIAS_OPTION_LEN ]; } aliases[] __initconst = { + { "kvm-arm.mode=nvhe", "id_aa64mmfr1.vh=0" }, + { "kvm-arm.mode=protected", "id_aa64mmfr1.vh=0" }, }; static int __init find_field(const char *cmdline,
arch/arm64/kvm/arm.c +3 -0
@@ -1966,6 +1966,9 @@ static int __init early_kvm_mode_cfg(char *arg)return 0 ; } +if (strcmp (arg,"nvhe" ) ==0 && !WARN_ON (is_kernel_in_hyp_mode ())) +return 0 ; +return -EINVAL ; }early_param ("kvm-arm.mode" , early_kvm_mode_cfg);
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 18/23 KVM: arm64: Document HVC_VHE_RESTART stub hypercall
In reply to Marc ZyngierFor completeness, let's document the HVC_VHE_RESTART stub.
--- Documentation/virt/kvm/arm/hyp-abi.rst | 9 +++++++++ 1 file changed, 9 insertions(+)
Documentation/virt/kvm/arm/hyp-abi.rst +9 -0
@@ -58,6 +58,15 @@ these functions (see arch/arm{,64}/include/asm/virt.h): into place (arm64 only), and jump to the restart address while at HYP/EL2. This hypercall is not expected to return to its caller. +* :: + + x0 = HVC_VHE_RESTART (arm64 only) + + Attempt to upgrade the kernel's exception level from EL1 to EL2 by enabling + the VHE mode. This is conditioned by the CPU supporting VHE, the EL2 MMU + being off, and VHE not being disabled by any other means (command line + option, for example). + Any other value of r0/x0 triggers a hypervisor-specific handling, which is not documented here.
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 19/23 arm64: Move "nokaslr" over to the early cpufeature infrastructure
In reply to Marc ZyngierGiven that the early cpufeature infrastructure has borrowed quite a lot of code from the kaslr implementation, let's reimplement the matching of the "nokaslr" option with it.
--- arch/arm64/kernel/idreg-override.c | 15 +++++++++++++ arch/arm64/kernel/kaslr.c | 36 ++---------------------------- 2 files changed, 17 insertions(+), 34 deletions(-)
arch/arm64/kernel/idreg-override.c +15 -0
@@ -37,8 +37,22 @@ static const struct ftr_set_desc mmfr1 __initconst = { }, }; +extern struct arm64_ftr_override kaslr_feature_override; + +static const struct ftr_set_desc kaslr__initconst = { + .name ="kaslr" , +#ifdef CONFIG_RANDOMIZE_BASE + .override = &kaslr_feature_override, +#endif + .fields = { + {"disabled" ,0 }, + {} + }, +}; +static const struct ftr_set_desc *const regs[]__initconst = { &mmfr1, + &kaslr, }; static const struct {
@@ -47,6 +61,7 @@ static const struct { } aliases[] __initconst = { { "kvm-arm.mode=nvhe", "id_aa64mmfr1.vh=0" }, { "kvm-arm.mode=protected", "id_aa64mmfr1.vh=0" }, + { "nokaslr", "kaslr.disabled=1" }, }; static int __init find_field(const char *cmdline,
arch/arm64/kernel/kaslr.c +2 -34
@@ -51,39 +51,7 @@ static __init u64 get_kaslr_seed(void *fdt)return ret; } -static __init bool cmdline_contains_nokaslr (const u8 *cmdline) -{ -const u8 *str; - - str =strstr (cmdline,"nokaslr" ); -return str == cmdline || (str > cmdline && *(str -1 ) ==' ' ); -} - -static __init bool is_kaslr_disabled_cmdline (void *fdt) -{ -if (!IS_ENABLED (CONFIG_CMDLINE_FORCE )) { -int node; -const u8 *prop; - - node =fdt_path_offset (fdt,"/chosen" ); -if (node <0 ) - goto out; - - prop =fdt_getprop (fdt, node,"bootargs" ,NULL ); -if (!prop) - goto out; - -if (cmdline_contains_nokaslr (prop)) -return true; - -if (IS_ENABLED (CONFIG_CMDLINE_EXTEND )) - goto out; - -return false; - } -out: -return cmdline_contains_nokaslr (CONFIG_CMDLINE ); -} +struct arm64_ftr_override kaslr_feature_override__initdata ;/* * This routine will be executed with the kernel mapped at its default virtual
@@ -126,7 +94,7 @@ u64 __init kaslr_early_init(void)* Check if 'nokaslr' appears on the command line, and * return 0 if that is the case. */ -if (is_kaslr_disabled_cmdline (fdt)) { +if (kaslr_feature_override.val & kaslr_feature_override.mask &0xf ) { kaslr_status =KASLR_DISABLED_CMDLINE ;return 0 ; }
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 20/23 arm64: cpufeatures: Allow disabling of BTI from the command-line
In reply to Marc ZyngierIn order to be able to disable BTI at runtime, whether it is for testing purposes, or to work around HW issues, let's add support for overriding the ID_AA64PFR1_EL1.BTI field.
This is further mapped on the arm64.nobti command-line alias.
--- Documentation/admin-guide/kernel-parameters.txt | 3 +++ arch/arm64/include/asm/cpufeature.h | 1 + arch/arm64/kernel/cpufeature.c | 4 +++- arch/arm64/kernel/idreg-override.c | 11 +++++++++++ arch/arm64/mm/mmu.c | 2 +- 5 files changed, 19 insertions(+), 2 deletions(-)
Documentation/admin-guide/kernel-parameters.txt +3 -0
@@ -373,6 +373,9 @@ arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards Format: <io>,<irq>,<nodeID> + arm64.nobti [ARM64] Unconditionally disable Branch Target + Identification support + ataflop= [HW,M68k] atarimouse= [HW,MOUSE] Atari Mouse
arch/arm64/include/asm/cpufeature.h +1 -0
@@ -819,6 +819,7 @@ static inline unsigned int get_vmid_bits(u64 mmfr1) }extern struct arm64_ftr_override id_aa64mmfr1_override; +extern struct arm64_ftr_override id_aa64pfr1_override;u32 get_kvm_ipa_limit (void );void dump_cpu_features (void );
arch/arm64/kernel/cpufeature.c +3 -1
@@ -558,6 +558,7 @@ static const struct arm64_ftr_bits ftr_raz[] = {#define ARM64_FTR_REG (id, table) ARM64_FTR_REG_OVERRIDE(id, table, &no_override)struct arm64_ftr_override __ro_after_init id_aa64mmfr1_override; +struct arm64_ftr_override __ro_after_init id_aa64pfr1_override; static const struct __ftr_reg_entry { u32 sys_id;
@@ -593,7 +594,8 @@ static const struct __ftr_reg_entry {/* Op1 = 0, CRn = 0, CRm = 4 */ ARM64_FTR_REG (SYS_ID_AA64PFR0_EL1 , ftr_id_aa64pfr0), -ARM64_FTR_REG (SYS_ID_AA64PFR1_EL1 , ftr_id_aa64pfr1), +ARM64_FTR_REG_OVERRIDE (SYS_ID_AA64PFR1_EL1 , ftr_id_aa64pfr1, + &id_aa64pfr1_override), ARM64_FTR_REG(SYS_ID_AA64ZFR0_EL1, ftr_id_aa64zfr0),/* Op1 = 0, CRn = 0, CRm = 5 */
arch/arm64/kernel/idreg-override.c +11 -0
@@ -37,6 +37,15 @@ static const struct ftr_set_desc mmfr1 __initconst = { }, }; +static const struct ftr_set_desc pfr1__initconst = { + .name ="id_aa64pfr1" , + .override = &id_aa64pfr1_override, + .fields = { + {"bt" ,ID_AA64PFR1_BT_SHIFT }, + {} + }, +}; +extern struct arm64_ftr_override kaslr_feature_override;static const struct ftr_set_desc kaslr__initconst = {
@@ -52,6 +61,7 @@ static const struct ftr_set_desc kaslr __initconst = {static const struct ftr_set_desc *const regs[]__initconst = { &mmfr1, + &pfr1, &kaslr, };
@@ -61,6 +71,7 @@ static const struct { } aliases[] __initconst = { { "kvm-arm.mode=nvhe", "id_aa64mmfr1.vh=0" }, { "kvm-arm.mode=protected", "id_aa64mmfr1.vh=0" }, + { "arm64.nobti", "id_aa64pfr1.bt=0" }, { "nokaslr", "kaslr.disabled=1" }, };
arch/arm64/mm/mmu.c +1 -1
@@ -628,7 +628,7 @@ static bool arm64_early_this_cpu_has_bti(void)if (!IS_ENABLED (CONFIG_ARM64_BTI_KERNEL ))return false; - pfr1 =read_sysreg_s (SYS_ID_AA64PFR1_EL1 ); + pfr1 =__read_sysreg_by_encoding (SYS_ID_AA64PFR1_EL1 );return cpuid_feature_extract_unsigned_field (pfr1,ID_AA64PFR1_BT_SHIFT ); }
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 21/23 arm64: Defer enabling pointer authentication on boot core
In reply to Marc ZyngierFrom: Srinivas Ramana <[email protected]>
Defer enabling pointer authentication on boot core until after its required to be enabled by cpufeature framework. This will help in controlling the feature dynamically with a boot parameter.
--- arch/arm64/include/asm/pointer_auth.h | 10 ++++++++++ arch/arm64/include/asm/stackprotector.h | 1 + arch/arm64/kernel/head.S | 4 ---- 3 files changed, 11 insertions(+), 4 deletions(-)
arch/arm64/include/asm/pointer_auth.h +10 -0
@@ -76,6 +76,15 @@ static inline unsigned long ptrauth_strip_insn_pac(unsigned long ptr)return ptrauth_clear_pac (ptr); } +static __always_inline void ptrauth_enable(void) +{ +if (!system_supports_address_auth ()) +return ; +sysreg_clear_set (sctlr_el1,0 , (SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | + SCTLR_ELx_ENDA | SCTLR_ELx_ENDB)); +isb (); +} +#define ptrauth_thread_init_user (tsk) \ ptrauth_keys_init_user(&(tsk)->thread.keys_user)#define ptrauth_thread_init_kernel (tsk) \
@@ -84,6 +93,7 @@ static inline unsigned long ptrauth_strip_insn_pac(unsigned long ptr) ptrauth_keys_switch_kernel(&(tsk)->thread.keys_kernel)#else /* CONFIG_ARM64_PTR_AUTH */ +#define ptrauth_enable ()#define ptrauth_prctl_reset_keys (tsk, arg) (-EINVAL)#define ptrauth_strip_insn_pac (lr) (lr)#define ptrauth_thread_init_user (tsk)
arch/arm64/include/asm/stackprotector.h +1 -0
@@ -41,6 +41,7 @@ static __always_inline void boot_init_stack_canary(void)#endif ptrauth_thread_init_kernel (current);ptrauth_thread_switch_kernel (current); + ptrauth_enable(); }#endif /* _ASM_STACKPROTECTOR_H */
arch/arm64/kernel/head.S +0 -4
@@ -404,10 +404,6 @@ SYM_FUNC_START_LOCAL(__primary_switched) adr_l x5, init_task msr sp_el0, x5 // Save thread_info -#ifdef CONFIG_ARM64_PTR_AUTH - __ptrauth_keys_init_cpu x5, x6, x7, x8 -#endif - adr_l x8, vectors // load VBAR_EL1 with virtual msr vbar_el1, x8 // vector table address isb
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 22/23 arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line
In reply to Marc ZyngierIn order to be able to disable Pointer Authentication at runtime, whether it is for testing purposes, or to work around HW issues, let's add support for overriding the ID_AA64ISAR1_EL1.{GPI,GPA,API,APA} fields.
This is further mapped on the arm64.nopauth command-line alias.
--- Documentation/admin-guide/kernel-parameters.txt | 3 +++ arch/arm64/include/asm/cpufeature.h | 1 + arch/arm64/kernel/cpufeature.c | 4 +++- arch/arm64/kernel/idreg-override.c | 16 ++++++++++++++++ 4 files changed, 23 insertions(+), 1 deletion(-)
Documentation/admin-guide/kernel-parameters.txt +3 -0
@@ -376,6 +376,9 @@ arm64.nobti [ARM64] Unconditionally disable Branch Target Identification support + arm64.nopauth [ARM64] Unconditionally disable Pointer Authentication + support + ataflop= [HW,M68k] atarimouse= [HW,MOUSE] Atari Mouse
arch/arm64/include/asm/cpufeature.h +1 -0
@@ -820,6 +820,7 @@ static inline unsigned int get_vmid_bits(u64 mmfr1)extern struct arm64_ftr_override id_aa64mmfr1_override;extern struct arm64_ftr_override id_aa64pfr1_override; +extern struct arm64_ftr_override id_aa64isar1_override;u32 get_kvm_ipa_limit (void );void dump_cpu_features (void );
arch/arm64/kernel/cpufeature.c +3 -1
@@ -559,6 +559,7 @@ static const struct arm64_ftr_bits ftr_raz[] = {struct arm64_ftr_override __ro_after_init id_aa64mmfr1_override;struct arm64_ftr_override __ro_after_init id_aa64pfr1_override; +struct arm64_ftr_override __ro_after_init id_aa64isar1_override; static const struct __ftr_reg_entry { u32 sys_id;
@@ -604,7 +605,8 @@ static const struct __ftr_reg_entry {/* Op1 = 0, CRn = 0, CRm = 6 */ ARM64_FTR_REG (SYS_ID_AA64ISAR0_EL1 , ftr_id_aa64isar0), -ARM64_FTR_REG (SYS_ID_AA64ISAR1_EL1 , ftr_id_aa64isar1), +ARM64_FTR_REG_OVERRIDE (SYS_ID_AA64ISAR1_EL1 , ftr_id_aa64isar1, + &id_aa64isar1_override),/* Op1 = 0, CRn = 0, CRm = 7 */ ARM64_FTR_REG(SYS_ID_AA64MMFR0_EL1, ftr_id_aa64mmfr0),
arch/arm64/kernel/idreg-override.c +16 -0
@@ -46,6 +46,18 @@ static const struct ftr_set_desc pfr1 __initconst = { }, }; +static const struct ftr_set_desc isar1__initconst = { + .name ="id_aa64isar1" , + .override = &id_aa64isar1_override, + .fields = { + {"gpi" ,ID_AA64ISAR1_GPI_SHIFT }, + {"gpa" ,ID_AA64ISAR1_GPA_SHIFT }, + {"api" ,ID_AA64ISAR1_API_SHIFT }, + {"apa" ,ID_AA64ISAR1_APA_SHIFT }, + {} + }, +}; +extern struct arm64_ftr_override kaslr_feature_override;static const struct ftr_set_desc kaslr__initconst = {
@@ -62,6 +74,7 @@ static const struct ftr_set_desc kaslr __initconst = {static const struct ftr_set_desc *const regs[]__initconst = { &mmfr1, &pfr1, + &isar1, &kaslr, };
@@ -72,6 +85,9 @@ static const struct { { "kvm-arm.mode=nvhe", "id_aa64mmfr1.vh=0" }, { "kvm-arm.mode=protected", "id_aa64mmfr1.vh=0" }, { "arm64.nobti", "id_aa64pfr1.bt=0" }, + { "arm64.nopauth", +"id_aa64isar1.gpi=0 id_aa64isar1.gpa=0 " + "id_aa64isar1.api=0 id_aa64isar1.apa=0" }, { "nokaslr", "kaslr.disabled=1" }, };
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerPATCH v7 23/23 arm64: Cope with CPUs stuck in VHE mode
In reply to Marc ZyngierIt seems that the CPU known as Apple M1 has the terrible habit of being stuck with HCR_EL2.E2H==1, in violation of the architecture.
Try and work around this deplorable state of affairs by detecting the stuck bit early and short-circuit the nVHE dance. It is still unknown whether there are many more such nuggets to be found...
--- arch/arm64/kernel/head.S | 33 ++++++++++++++++++++++++++++++--- arch/arm64/kernel/hyp-stub.S | 28 ++++++++++++++++++++++++---- 2 files changed, 54 insertions(+), 7 deletions(-)
arch/arm64/kernel/head.S +30 -3
@@ -477,14 +477,13 @@ EXPORT_SYMBOL(kimage_vaddr) * booted in EL1 or EL2 respectively. */ SYM_FUNC_START(init_kernel_el) - mov_q x0, INIT_SCTLR_EL1_MMU_OFF - msr sctlr_el1, x0 - mrs x0, CurrentEL cmp x0, #CurrentEL_EL2 b.eq init_el2 SYM_INNER_LABEL(init_el1, SYM_L_LOCAL) + mov_q x0, INIT_SCTLR_EL1_MMU_OFF + msr sctlr_el1, x0 isb mov_q x0, INIT_PSTATE_EL1 msr spsr_el1, x0
@@ -504,6 +503,34 @@ SYM_INNER_LABEL(init_el2, SYM_L_LOCAL) msr vbar_el2, x0 isb + /* + * Fruity CPUs seem to have HCR_EL2.E2H set to RES1, + * making it impossible to start in nVHE mode. Is that + * compliant with the architecture? Absolutely not! + */ + mrs x0, hcr_el2 + and x0, x0, #HCR_E2H + cbz x0, 1f + + /* Switching to VHE requires a sane SCTLR_EL1 as a start */ + mov_q x0, INIT_SCTLR_EL1_MMU_OFF + msr_s SYS_SCTLR_EL12, x0 + + /* + * Force an eret into a helper "function", and let it return + * to our original caller... This makes sure that we have + * initialised the basic PSTATE state. + */ + mov x0, #INIT_PSTATE_EL2 + msr spsr_el1, x0 + adr_l x0, stick_to_vhe + msr elr_el1, x0 + eret + +1: + mov_q x0, INIT_SCTLR_EL1_MMU_OFF + msr sctlr_el1, x0 + msr elr_el2, lr mov w0, #BOOT_CPU_MODE_EL2 eret
arch/arm64/kernel/hyp-stub.S +24 -4
@@ -27,12 +27,12 @@ SYM_CODE_START(__hyp_stub_vectors) ventry el2_fiq_invalid // FIQ EL2t ventry el2_error_invalid // Error EL2t - ventry el2_sync_invalid // Synchronous EL2h + ventry elx_sync // Synchronous EL2h ventry el2_irq_invalid // IRQ EL2h ventry el2_fiq_invalid // FIQ EL2h ventry el2_error_invalid // Error EL2h - ventry el1_sync // Synchronous 64-bit EL1 + ventry elx_sync // Synchronous 64-bit EL1 ventry el1_irq_invalid // IRQ 64-bit EL1 ventry el1_fiq_invalid // FIQ 64-bit EL1 ventry el1_error_invalid // Error 64-bit EL1
@@ -45,7 +45,7 @@ SYM_CODE_END(__hyp_stub_vectors) .align 11 -SYM_CODE_START_LOCAL(el1_sync) +SYM_CODE_START_LOCAL(elx_sync) cmp x0, #HVC_SET_VECTORS b.ne 1f msr vbar_el2, x1
@@ -71,7 +71,7 @@ SYM_CODE_START_LOCAL(el1_sync) 9: mov x0, xzr eret -SYM_CODE_END(el1_sync) +SYM_CODE_END(elx_sync) // nVHE? No way! Give me the real thing! SYM_CODE_START_LOCAL(mutate_to_vhe)
@@ -227,3 +227,23 @@ SYM_FUNC_START(switch_to_vhe) #endif ret SYM_FUNC_END(switch_to_vhe) + +SYM_FUNC_START(stick_to_vhe) + /* + * Make sure the switch to VHE cannot fail, by overriding the + * override. This is hilarious. + */ + adr_l x1, id_aa64mmfr1_override + add x1, x1, #FTR_OVR_MASK_OFFSET + dc civac, x1 + dsb sy + isb + ldr x0, [x1] + bic x0, x0, #(0xf << ID_AA64MMFR1_VHE_SHIFT) + str x0, [x1] + + mov x0, #HVC_VHE_RESTART + hvc #0 + mov x0, #BOOT_CPU_MODE_EL2 + ret +SYM_FUNC_END(stick_to_vhe)
Signature · 6 lines
2.29.2 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Re: [PATCH v7 23/23] [DO NOT MERGE] arm64: Cope with CPUs stuck in VHE mode
Hi,
Quoted 2 lines · Marc Zyngier
It seems that the CPU known as Apple M1 has the terrible habit of being stuck with HCR_EL2.E2H==1, in violation of the architecture.
Minor nitpick from the sideline: The M1 SoC has two kinds of CPU in it (Icestorm and Firestorm), which makes "CPU known as Apple M1" a bit imprecise.
In practicality it seems unlikely though, that Icestorm and Firestorm act differently with regards to the code in this patch.
Best regards,
Jonathan Neuschäfer
Quoted 11 lines
Try and work around this deplorable state of affairs by detecting the stuck bit early and short-circuit the nVHE dance. It is still unknown whether there are many more such nuggets to be found...
Reported-by Hector Martin <[email protected]>Signed-off-by Marc Zyngier <[email protected]>--- arch/arm64/kernel/head.S | 33 ++++++++++++++++++++++++++++++--- arch/arm64/kernel/hyp-stub.S | 28 ++++++++++++++++++++++++---- 2 files changed, 54 insertions(+), 7 deletions(-)
[...]
Marc Zyngier
maintainerRe: [PATCH v7 23/23] [DO NOT MERGE] arm64: Cope with CPUs stuck in VHE mode
Hi Jonathan,
Quoted 9 lines · Jonathan Neuschäfer
Hi,
Quoted 2 lines · Marc Zyngier
It seems that the CPU known as Apple M1 has the terrible habit of being stuck with HCR_EL2.E2H==1, in violation of the architecture.
Minor nitpick from the sideline: The M1 SoC has two kinds of CPU in it (Icestorm and Firestorm), which makes "CPU known as Apple M1" a bit imprecise.
Fair enough. How about something along the lines of:
"At least some of the CPUs integrated in the Apple M1 SoC have
the terrible habit..."
Quoted 2 lines
In practicality it seems unlikely though, that Icestorm and Firestorm act differently with regards to the code in this patch.
This is my hunch as well. And if they did, it shouldn't be a big deal:
the "architecture compliant" CPUs would simply transition via EL1 as expected, and join their buggy friends running at EL2 slightly later.
Thanks,
M.
Signature · 5 lines
Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Will Deacon
maintainerHi Marc,
Quoted 7 lines · Marc Zyngier
It recently came to light that there is a need to be able to override some CPU features very early on, before the kernel is fully up and running. The reasons for this range from specific feature support (such as using Protected KVM on VHE HW, which is the main motivation for this work) to errata workaround (a feature is broken on a CPU and needs to be turned off, or rather not enabled).
Quoted 5 lines
This series tries to offer a limited framework for this kind of problems, by allowing a set of options to be passed on the command-line and altering the feature set that the cpufeature subsystem exposes to the rest of the kernel. Note that this doesn't change anything for code that directly uses the CPU ID registers.
I applied this locally, but I'm seeing consistent boot failure under QEMU when KASAN is enabled. I tried sprinkling some __no_sanitize_address annotations around (see below) but it didn't help. The culprit appears to be early_fdt_map(), but looking a bit more closely, I'm really nervous about the way we call into C functions from __primary_switched. Remember -- this code runs _twice_ when KASLR is active: before and after the randomization. This also means that any memory writes the first time around can be lost due to the D-cache invalidation when (re-)creating the kernel page-tables.
Will
--->8
arch/arm64/kernel/idreg-override.c +1 -1
@@ -195,7 +195,7 @@ static __init void parse_cmdline(void)/* Keep checkers quiet */ void init_feature_override (void ); -asmlinkage void __init init_feature_override(void) +asmlinkage void __init __no_sanitize_address init_feature_override(void) {int i;
arch/arm64/kernel/setup.c +2 -2
@@ -170,12 +170,12 @@ static void __init smp_build_mpidr_hash(void)static void *early_fdt_ptr__initdata ; -void __init *get_early_fdt_ptr (void ) +void __init __no_sanitize_address *get_early_fdt_ptr(void) {return early_fdt_ptr; } -asmlinkage void __init early_fdt_map(u64 dt_phys) +asmlinkage void __init __no_sanitize_address early_fdt_map(u64 dt_phys) {int fdt_size;
_______________________________________________
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Quoted 17 lines · Will Deacon
Hi Marc,
Quoted 7 lines · Marc Zyngier
It recently came to light that there is a need to be able to override some CPU features very early on, before the kernel is fully up and running. The reasons for this range from specific feature support (such as using Protected KVM on VHE HW, which is the main motivation for this work) to errata workaround (a feature is broken on a CPU and needs to be turned off, or rather not enabled).
Quoted 5 lines
This series tries to offer a limited framework for this kind of problems, by allowing a set of options to be passed on the command-line and altering the feature set that the cpufeature subsystem exposes to the rest of the kernel. Note that this doesn't change anything for code that directly uses the CPU ID registers.
Quoted 9 lines
I applied this locally, but I'm seeing consistent boot failure under QEMU when KASAN is enabled. I tried sprinkling some
__no_sanitize_addressannotations around (see below) but it didn't help. The culprit appears to beearly_fdt_map(), but looking a bit more closely, I'm really nervous about the way we call into C functions from__primary_switched. Remember -- this code runs _twice_ when KASLR is active: before and after the randomization. This also means that any memory writes the first time around can be lost due to the D-cache invalidation when (re-)creating the kernel page-tables.
Not just cache invalidation - BSS gets wiped again as well.
Signature · 5 lines
Ard. _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerHi Will,
Quoted 16 lines · Will Deacon
Hi Marc,
Quoted 7 lines · Marc Zyngier
It recently came to light that there is a need to be able to override some CPU features very early on, before the kernel is fully up and running. The reasons for this range from specific feature support (such as using Protected KVM on VHE HW, which is the main motivation for this work) to errata workaround (a feature is broken on a CPU and needs to be turned off, or rather not enabled).
Quoted 5 lines
This series tries to offer a limited framework for this kind of problems, by allowing a set of options to be passed on the command-line and altering the feature set that the cpufeature subsystem exposes to the rest of the kernel. Note that this doesn't change anything for code that directly uses the CPU ID registers.
Quoted 8 lines
I applied this locally, but I'm seeing consistent boot failure under QEMU when KASAN is enabled. I tried sprinkling some
__no_sanitize_addressannotations around (see below) but it didn't help. The culprit appears to beearly_fdt_map(), but looking a bit more closely, I'm really nervous about the way we call into C functions from__primary_switched. Remember -- this code runs _twice_ when KASLR is active: before and after the randomization. This also means that any memory writes the first time around can be lost due to the D-cache invalidation when (re-)creating the kernel page-tables.
Well, we already call into C functions with KASLR, and nothing explodes with that, so I must be doing something else wrong.
I do have cache maintenance for the writes to the shadow registers, so that part should be fine. But I think I'm missing some cache maintenance around the FDT base itself, and I wonder what happens when we go around the loop.
I'll chase this down now.
Thanks for the heads up.
M.
Signature · 5 lines
Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
Marc Zyngier
maintainerQuoted 16 lines · Will Deacon
Hi Marc,
Quoted 7 lines · Marc Zyngier
It recently came to light that there is a need to be able to override some CPU features very early on, before the kernel is fully up and running. The reasons for this range from specific feature support (such as using Protected KVM on VHE HW, which is the main motivation for this work) to errata workaround (a feature is broken on a CPU and needs to be turned off, or rather not enabled).
Quoted 5 lines
This series tries to offer a limited framework for this kind of problems, by allowing a set of options to be passed on the command-line and altering the feature set that the cpufeature subsystem exposes to the rest of the kernel. Note that this doesn't change anything for code that directly uses the CPU ID registers.
Quoted 8 lines
I applied this locally, but I'm seeing consistent boot failure under QEMU when KASAN is enabled. I tried sprinkling some
__no_sanitize_addressannotations around (see below) but it didn't help. The culprit appears to beearly_fdt_map(), but looking a bit more closely, I'm really nervous about the way we call into C functions from__primary_switched. Remember -- this code runs _twice_ when KASLR is active: before and after the randomization. This also means that any memory writes the first time around can be lost due to the D-cache invalidation when (re-)creating the kernel page-tables.
Nailed it. Of course, before anything starts writing from C code, we need to have initialised KASAN. kasan_init.c itself is compiled without any address sanitising, but we can't repaint all the stuff that is called from early_fdt_map() (quite a lot).
So the natural thing to do is to keep kasan_early_init() as the first thing we do in C code, and everything falls from that.
Any chance you could try that on top and see if that cures your problem? If that works for you, I'll push an updates series.
Thanks,
M.
arch/arm64/kernel/head.S +3 -3
@@ -429,13 +429,13 @@ SYM_FUNC_START_LOCAL(__primary_switched) bl __pi_memset dsb ishst // Make zero page visible to PTW +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) + bl kasan_early_init +#endif mov x0, x21 // pass FDT address in x0 bl early_fdt_map // Try mapping the FDT early bl init_feature_override bl switch_to_vhe -#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) - bl kasan_early_init -#endif #ifdef CONFIG_RANDOMIZE_BASE tst x23, ~(MIN_KIMG_ALIGN - 1) // already running randomized? b.ne 0f
Signature · 5 lines
Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm