Jim Mattson ab112cc573 perf/x86/kvm: Fix Broadwell Xeon stepping in isolation_ucodes[] ... [ Upstream commit 4b2f1e59229b9da319d358828cdfa4ddbc140769 ] 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 Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-04-28 13:40:00 +02:00
..
amd	x86/events/amd/iommu: Fix sizeof mismatch	2020-10-03 16:30:56 +02:00
intel	perf/x86/kvm: Fix Broadwell Xeon stepping in isolation_ucodes[]	2021-04-28 13:40:00 +02:00
zhaoxin	x86/perf: Fix a typo	2020-07-22 10:22:08 +02:00
core.c	These are the performance events changes for v5.10:	2020-10-12 14:14:35 -07:00
Kconfig	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Makefile
msr.c	perf/x86/msr: Add Jasper Lake support	2020-09-29 09:57:02 +02:00
perf_event.h	perf/x86/intel: Make anythread filter support conditional	2020-11-09 18:12:36 +01:00
probe.c
probe.h
rapl.c	perf/x86: fix sysfs type mismatches	2020-11-17 13:15:38 +01:00