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linux-next/arch
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Jim Mattson 4b2f1e5922 perf/x86/kvm: Fix Broadwell Xeon stepping in isolation_ucodes[] 
The only stepping of Broadwell Xeon parts is stepping 1. Fix the
relevant isolation_ucodes[] entry, which previously enumerated
stepping 2.

Although the original commit was characterized as an optimization, it
is also a workaround for a correctness issue.

If a PMI arrives between kvm's call to perf_guest_get_msrs() and the
subsequent VM-entry, a stale value for the IA32_PEBS_ENABLE MSR may be
restored at the next VM-exit. This is because, unbeknownst to kvm, PMI
throttling may clear bits in the IA32_PEBS_ENABLE MSR. CPUs with "PEBS
isolation" don't suffer from this issue, because perf_guest_get_msrs()
doesn't report the IA32_PEBS_ENABLE value.

Fixes: 9b545c04ab ("perf/x86/kvm: Avoid unnecessary work in guest filtering")
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Peter Shier <pshier@google.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Link: https://lkml.kernel.org/r/20210422001834.1748319-1-jmattson@google.com
2021-04-22 14:36:01 +02:00
..
alpha io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
arc ARC: treewide: avoid the pointer addition with NULL pointer 2021-03-22 10:05:43 -07:00
arm ARM SoC fixes for v5.12, part 2 2021-04-18 13:23:26 -07:00
arm64 ARM SoC fixes for v5.12, part 2 2021-04-18 13:23:26 -07:00
csky csky: change a Kconfig symbol name to fix e1000 build error 2021-04-16 16:10:36 -07:00
h8300 arch: setup PF_IO_WORKER threads like PF_KTHREAD 2021-02-21 17:25:22 -07:00
hexagon io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
ia64 ia64: fix discontig.c section mismatches 2021-04-16 16:10:37 -07:00
m68k m68k: fix flatmem memory model setup 2021-04-12 09:34:26 +10:00
microblaze io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
mips MIPS: kernel: setup.c: fix compilation error 2021-03-30 14:51:23 +02:00
nds32 nds32: flush_dcache_page: use page_mapping_file to avoid races with swapoff 2021-04-09 14:54:23 -07:00
nios2 io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
openrisc io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
parisc parisc: math-emu: Few spelling fixes in the file fpu.h 2021-04-06 15:34:14 +02:00
powerpc powerpc/vdso: Make sure vdso_wrapper.o is rebuilt everytime vdso.so is rebuilt 2021-04-02 00:18:09 +11:00
riscv riscv: keep interrupts disabled for BREAKPOINT exception 2021-04-15 21:32:40 -07:00
s390 s390/entry: save the caller of psw_idle 2021-04-12 12:44:31 +02:00
sh io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
sparc Merge git://git.kernel.org:/pub/scm/linux/kernel/git/davem/sparc 2021-03-09 17:08:41 -08:00
um io_uring-worker.v3-2021-02-25 2021-02-27 08:29:02 -08:00
x86 perf/x86/kvm: Fix Broadwell Xeon stepping in isolation_ucodes[] 2021-04-22 14:36:01 +02:00
xtensa xtensa: fix uaccess-related livelock in do_page_fault 2021-03-29 11:25:11 -07:00
.gitignore
Kconfig kbuild: remove LLVM=1 test from HAS_LTO_CLANG 2021-03-11 14:52:55 +09:00