KVM: PPC: Book3S HV: Handle host system reset in guest mode

If the host takes a system reset interrupt while a guest is running, the CPU must exit the guest before processing the host exception handler.

After this patch, taking a sysrq+x with a CPU running in a guest gives a trace like this:

cpu 0x27: Vector: 100 (System Reset) at [c000000fdf5776f0]

       pc: c008000010158b80: kvmppc_run_core+0x16b8/0x1ad0 [kvm_hv]
       lr: c008000010158b80: kvmppc_run_core+0x16b8/0x1ad0 [kvm_hv]
       sp: c000000fdf577850
      msr: 9000000002803033
     current = 0xc000000fdf4b1e00
     paca    = 0xc00000000fd4d680	 softe: 3	 irq_happened: 0x01
       pid   = 6608, comm = qemu-system-ppc

Linux version 4.14.0-rc7-01489-g47e1893a404a-dirty #26 SMP [c000000fdf577a00] c008000010159dd4 kvmppc_vcpu_run_hv+0x3dc/0x12d0 [kvm_hv] [c000000fdf577b30] c0080000100a537c kvmppc_vcpu_run+0x44/0x60 [kvm] [c000000fdf577b60] c0080000100a1ae0 kvm_arch_vcpu_ioctl_run+0x118/0x310 [kvm] [c000000fdf577c00] c008000010093e98 kvm_vcpu_ioctl+0x530/0x7c0 [kvm] [c000000fdf577d50] c000000000357bf8 do_vfs_ioctl+0xd8/0x8c0 [c000000fdf577df0] c000000000358448 SyS_ioctl+0x68/0x100 [c000000fdf577e30] c00000000000b220 system_call+0x58/0x6c
--- Exception: c01 (System Call) at 00007fff76868df0
SP (7fff7069baf0) is in userspace

--

It has always been possible to sreset the host with direct scom access, but the patch e36d0a2ed5 has significantly expanded this functionality so in practice this is a required as a fix for it.

For 4.14 I think we will either need to fix this, or disable e36d0a2ed5, otherwise the host could be exposed to the guest MMU (at least with hash).

Thanks,
Nick

---
 arch/powerpc/include/asm/hw_irq.h       | 1 +
 arch/powerpc/kernel/exceptions-64s.S    | 2 ++
 arch/powerpc/kernel/irq.c               | 3 ++-
 arch/powerpc/kvm/book3s_hv.c            | 7 ++++++-
 arch/powerpc/kvm/book3s_hv_rmhandlers.S | 4 ++++
 5 files changed, 15 insertions(+), 2 deletions(-)

index 92a3e9a79cb4..a8bbac425ae6 100644
@@ -40,6 +40,7 @@
 
 #ifndef __ASSEMBLY__
 
+extern void replay_system_reset(void);
 extern void __replay_interrupt(unsigned int vector);
 
 extern void timer_interrupt(struct pt_regs *);

index 651e1a0114ed..bff2ed6e3c3c 100644
@@ -113,6 +113,7 @@ EXC_VIRT_NONE(0x4000, 0x100)
 	cmpwi	cr3,r10,2 ;						\
 	BRANCH_TO_C000(r10, system_reset_idle_common) ;			\
 1:									\
+	KVMTEST_PR(n) ;							\
 	END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
 #else
 #define IDLETEST NOTEST

@@ -129,6 +130,7 @@ EXC_REAL_BEGIN(system_reset, 0x100, 0x100)
 
 EXC_REAL_END(system_reset, 0x100, 0x100)
 EXC_VIRT_NONE(0x4100, 0x100)
+TRAMP_KVM(PACA_EXNMI, 0x100)
 
 #ifdef CONFIG_PPC_P7_NAP
 EXC_COMMON_BEGIN(system_reset_idle_common)

index efbadcbbf694..7e8259106944 100644
@@ -437,7 +437,7 @@ static const u8 srr1_to_lazyirq[0x10] = {
 	PACA_IRQ_HMI,
 	0, 0, 0, 0, 0 };
 
-static noinline void replay_system_reset(void)
+void replay_system_reset(void)
 {
 	struct pt_regs regs;
 

@@ -447,6 +447,7 @@ static noinline void replay_system_reset(void)
 	system_reset_exception(&regs);
 	get_paca()->in_nmi = 0;
 }
+EXPORT_SYMBOL_GPL(replay_system_reset);
 
 void irq_set_pending_from_srr1(unsigned long srr1)
 {

index 8f34715cfbff..31a362669fea 100644
@@ -47,6 +47,7 @@
 
 #include <asm/reg.h>
 #include <asm/ppc-opcode.h>
+#include <asm/asm-prototypes.h>
 #include <asm/disassemble.h>
 #include <asm/cputable.h>
 #include <asm/cacheflush.h>

@@ -1089,9 +1090,10 @@ static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		vcpu->stat.ext_intr_exits++;
 		r = RESUME_GUEST;
 		break;
-	/* HMI is hypervisor interrupt and host has handled it. Resume guest.*/
+	/* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
 	case BOOK3S_INTERRUPT_HMI:
 	case BOOK3S_INTERRUPT_PERFMON:
+	case BOOK3S_INTERRUPT_SYSTEM_RESET:
 		r = RESUME_GUEST;
 		break;
 	case BOOK3S_INTERRUPT_MACHINE_CHECK:

@@ -2604,6 +2606,9 @@ static void set_irq_happened(int trap)
 	case BOOK3S_INTERRUPT_HMI:
 		local_paca->irq_happened |= PACA_IRQ_HMI;
 		break;
+	case BOOK3S_INTERRUPT_SYSTEM_RESET:
+		replay_system_reset();
+		break;
 	}
 }
 

index 68bf0f14a962..74958ad5efb9 100644
@@ -1427,6 +1427,10 @@ guest_exit_cont:		/* r9 = vcpu, r12 = trap, r13 = paca */
 	/* don't overwrite fault_dar/fault_dsisr if HDSI */
 	cmpwi	r12,BOOK3S_INTERRUPT_H_DATA_STORAGE
 	beq	mc_cont
+
+	cmpwi	r12, BOOK3S_INTERRUPT_SYSTEM_RESET
+	beq	mc_cont
+
 	std	r6, VCPU_FAULT_DAR(r9)
 	stw	r7, VCPU_FAULT_DSISR(r9)
 

2.15.0

Looks good, except that you don't need the last hunk (the change to book3s_hv_rmhandlers.S) as far as I can see:

Paul.