5.4.184-rc2 review

This is the start of the stable review cycle for the 5.4.184 release. There are 33 patches in this series, all will be posted as a response to this one. If anyone has any issues with these being applied, please let me know.

Responses should be made by Sat, 12 Mar 2022 14:07:58 +0000. Anything received after that time might be too late.

The whole patch series can be found in one patch at:

	https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.4.184-rc2.gz

or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y
and the diffstat can be found below.

thanks,

greg k-h

-------------
Pseudo-Shortlog of commits:

Greg Kroah-Hartman <[email protected]>

    Linux 5.4.184-rc2

Greg Kroah-Hartman <[email protected]>
Revert "ACPI: PM: s2idle: Cancel wakeup before dispatching EC GPE"

Juergen Gross <[email protected]>
xen/netfront: react properly to failing gnttab_end_foreign_access_ref()

Juergen Gross <[email protected]>
xen/gnttab: fix gnttab_end_foreign_access() without page specified

Juergen Gross <[email protected]>
xen/pvcalls: use alloc/free_pages_exact()

Juergen Gross <[email protected]>
xen/9p: use alloc/free_pages_exact()

Juergen Gross <[email protected]>
xen: remove gnttab_query_foreign_access()

Juergen Gross <[email protected]>
xen/gntalloc: don't use gnttab_query_foreign_access()

Juergen Gross <[email protected]>
xen/scsifront: don't use gnttab_query_foreign_access() for mapped status

Juergen Gross <[email protected]>
xen/netfront: don't use gnttab_query_foreign_access() for mapped status

Juergen Gross <[email protected]>
xen/blkfront: don't use gnttab_query_foreign_access() for mapped status

Juergen Gross <[email protected]>
xen/grant-table: add gnttab_try_end_foreign_access()

Juergen Gross <[email protected]>
xen/xenbus: don't let xenbus_grant_ring() remove grants in error case

Russell King (Oracle) <[email protected]>
ARM: fix build warning in proc-v7-bugs.c

Nathan Chancellor <[email protected]>
ARM: Do not use NOCROSSREFS directive with ld.lld

Russell King (Oracle) <[email protected]>
ARM: fix co-processor register typo

Emmanuel Gil Peyrot <[email protected]>
ARM: fix build error when BPF_SYSCALL is disabled

Russell King (Oracle) <[email protected]>
ARM: include unprivileged BPF status in Spectre V2 reporting

Russell King (Oracle) <[email protected]>
ARM: Spectre-BHB workaround

Russell King (Oracle) <[email protected]>
ARM: use LOADADDR() to get load address of sections

Russell King (Oracle) <[email protected]>
ARM: early traps initialisation

Russell King (Oracle) <[email protected]>
ARM: report Spectre v2 status through sysfs

Mark Rutland <[email protected]>

    arm/arm64: smccc/psci: add arm_smccc_1_1_get_conduit()

Steven Price <[email protected]>
arm/arm64: Provide a wrapper for SMCCC 1.1 calls

Josh Poimboeuf <[email protected]>
x86/speculation: Warn about eIBRS + LFENCE + Unprivileged eBPF + SMT

Josh Poimboeuf <[email protected]>
x86/speculation: Warn about Spectre v2 LFENCE mitigation

Kim Phillips <[email protected]>
x86/speculation: Update link to AMD speculation whitepaper

Kim Phillips <[email protected]>
x86/speculation: Use generic retpoline by default on AMD

Josh Poimboeuf <[email protected]>
x86/speculation: Include unprivileged eBPF status in Spectre v2 mitigation reporting

Peter Zijlstra <[email protected]>
Documentation/hw-vuln: Update spectre doc

Peter Zijlstra <[email protected]>
x86/speculation: Add eIBRS + Retpoline options

Peter Zijlstra (Intel) <[email protected]>
x86/speculation: Rename RETPOLINE_AMD to RETPOLINE_LFENCE

Peter Zijlstra <[email protected]>
x86,bugs: Unconditionally allow spectre_v2=retpoline,amd

Borislav Petkov <[email protected]>
x86/speculation: Merge one test in spectre_v2_user_select_mitigation()

-------------

Diffstat:

 Documentation/admin-guide/hw-vuln/spectre.rst   |  48 ++++--
 Documentation/admin-guide/kernel-parameters.txt |   8 +-
 Makefile                                        |   4 +-
 arch/arm/include/asm/assembler.h                |  10 ++
 arch/arm/include/asm/spectre.h                  |  32 ++++
 arch/arm/kernel/Makefile                        |   2 +
 arch/arm/kernel/entry-armv.S                    |  79 ++++++++-
 arch/arm/kernel/entry-common.S                  |  24 +++
 arch/arm/kernel/spectre.c                       |  71 ++++++++
 arch/arm/kernel/traps.c                         |  65 ++++++-
 arch/arm/kernel/vmlinux.lds.h                   |  43 ++++-
 arch/arm/mm/Kconfig                             |  11 ++
 arch/arm/mm/proc-v7-bugs.c                      | 200 +++++++++++++++++++---
 arch/x86/include/asm/cpufeatures.h              |   2 +-
 arch/x86/include/asm/nospec-branch.h            |  16 +-
 arch/x86/kernel/cpu/bugs.c                      | 216 +++++++++++++++++-------
 drivers/acpi/ec.c                               |  10 --
 drivers/acpi/sleep.c                            |  14 +-
 drivers/block/xen-blkfront.c                    |  63 ++++---
 drivers/firmware/psci/psci.c                    |  15 ++
 drivers/net/xen-netfront.c                      |  54 +++---
 drivers/scsi/xen-scsifront.c                    |   3 +-
 drivers/xen/gntalloc.c                          |  25 +--
 drivers/xen/grant-table.c                       |  71 ++++----
 drivers/xen/pvcalls-front.c                     |   8 +-
 drivers/xen/xenbus/xenbus_client.c              |  24 ++-
 include/linux/arm-smccc.h                       |  74 ++++++++
 include/linux/bpf.h                             |  12 ++
 include/xen/grant_table.h                       |  19 ++-
 kernel/sysctl.c                                 |   8 +
 net/9p/trans_xen.c                              |  14 +-
 tools/arch/x86/include/asm/cpufeatures.h        |   2 +-
 32 files changed, 970 insertions(+), 277 deletions(-)