[GIT PULL] x86/urgent for v5.11-rc7

[Borislav Petkov]

Hi Linus,

I hope this is the last batch of x86/urgent updates for this round.

Pls pull,
thx.

---

The following changes since commit 6ee1d745b7c9fd573fba142a2efdad76a9f1cb04:

  Linux 5.11-rc5 (2021-01-24 16:47:14 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git tags/x86_urgent_for_v5.11_rc7

for you to fetch changes up to 816ef8d7a2c4182e19bc06ab65751cb9e3951e94:

  x86/efi: Remove EFI PGD build time checks (2021-02-06 13:54:14 +0100)

----------------------------------------------------------------
- Remove superfluous EFI PGD range checks which lead to those assertions failing
with certain kernel configs and LLVM.

- Disable setting breakpoints on facilities involved in #DB exception handling
to avoid infinite loops.

- Add extra serialization to non-serializing MSRs (IA32_TSC_DEADLINE and
x2 APIC MSRs) to adhere to SDM's recommendation and avoid any theoretical
issues.

- Re-add the EPB MSR reading on turbostat so that it works on older
kernels which don't have the corresponding EPB sysfs file.

- Add Alder Lake to the list of CPUs which support split lock.

- Fix %dr6 register handling in order to be able to set watchpoints with gdb
again.

- Disable CET instrumentation in the kernel so that gcc doesn't add
ENDBR64 to kernel code and thus confuse tracing.

----------------------------------------------------------------
Borislav Petkov (2):
      tools/power/turbostat: Fallback to an MSR read for EPB
      x86/efi: Remove EFI PGD build time checks

Dave Hansen (1):
      x86/apic: Add extra serialization for non-serializing MSRs

Fenghua Yu (1):
      x86/split_lock: Enable the split lock feature on another Alder Lake CPU

Josh Poimboeuf (1):
      x86/build: Disable CET instrumentation in the kernel

Lai Jiangshan (2):
      x86/debug: Prevent data breakpoints on __per_cpu_offset
      x86/debug: Prevent data breakpoints on cpu_dr7

Peter Zijlstra (1):
      x86/debug: Fix DR6 handling

 Makefile                              |  6 ----
 arch/x86/Makefile                     |  3 ++
 arch/x86/include/asm/apic.h           | 10 ------
 arch/x86/include/asm/barrier.h        | 18 +++++++++++
 arch/x86/kernel/apic/apic.c           |  4 +++
 arch/x86/kernel/apic/x2apic_cluster.c |  6 ++--
 arch/x86/kernel/apic/x2apic_phys.c    |  9 ++++--
 arch/x86/kernel/cpu/intel.c           |  1 +
 arch/x86/kernel/hw_breakpoint.c       | 61 +++++++++++++++++++++++------------
 arch/x86/platform/efi/efi_64.c        | 19 -----------
 tools/power/x86/turbostat/turbostat.c | 10 +++++-
 11 files changed, 85 insertions(+), 62 deletions(-)

-- 
Regards/Gruss,
    Boris.

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