AuxXxilium/linux_dsm_epyc7002
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ab112cc573
linux_dsm_epyc7002/arch/x86
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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
..
boot A set of fixes for x86: 2020-12-06 11:22:39 -08:00
configs * A defconfig fix, from Daniel Díaz. 2020-09-20 15:06:43 -07:00
crypto crypto: x86/aes-ni-xts - use direct calls to and 4-way stride 2021-03-20 10:43:43 +01:00
entry x86/entry: Fix entry/exit mismatch on failed fast 32-bit syscalls 2021-03-17 17:06:36 +01:00
events perf/x86/kvm: Fix Broadwell Xeon stepping in isolation_ucodes[] 2021-04-28 13:40:00 +02:00
hyperv x86/hyperv: Fix kexec panic/hang issues 2021-01-27 11:54:57 +01:00
ia32 x86: remove address space overrides using set_fs() 2020-09-08 22:21:36 -04:00
include ACPI: processor: Fix build when CONFIG_ACPI_PROCESSOR=m 2021-04-14 08:41:58 +02:00
kernel ACPI: x86: Call acpi_boot_table_init() after acpi_table_upgrade() 2021-04-21 13:00:51 +02:00
kvm KVM: VMX: Don't use vcpu->run->internal.ndata as an array index 2021-04-21 13:00:59 +02:00
lib x86/sev-es: Use __copy_from_user_inatomic() 2021-03-17 17:06:36 +01:00
math-emu treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mm x86/mem_encrypt: Correct physical address calculation in __set_clr_pte_enc() 2021-03-30 14:32:07 +02:00
net bpf, x86: Validate computation of branch displacements for x86-32 2021-04-10 13:36:11 +02:00
oprofile
pci x86/pci: Create PCI/MSI irqdomain after x86_init.pci.arch_init() 2021-02-17 11:02:28 +01:00
platform x86/efi: Remove EFI PGD build time checks 2021-02-17 11:02:24 +01:00
power Kbuild updates for v5.9 2020-08-09 14:10:26 -07:00
purgatory treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
ras
realmode x86/head/64: Don't call verify_cpu() on starting APs 2020-09-09 11:33:20 +02:00
tools x86/build: Treat R_386_PLT32 relocation as R_386_PC32 2021-03-07 12:34:04 +01:00
um arch/um: partially revert the conversion to __section() macro 2020-10-26 15:39:37 -07:00
video
xen Revert "xen: fix p2m size in dom0 for disabled memory hotplug case" 2021-03-30 14:32:08 +02:00
.gitignore
Kbuild
Kconfig fanotify: Fix sys_fanotify_mark() on native x86-32 2021-01-17 14:16:59 +01:00
Kconfig.assembler
Kconfig.cpu
Kconfig.debug x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}() 2020-10-06 11:18:04 +02:00
Makefile x86/build: Turn off -fcf-protection for realmode targets 2021-04-10 13:36:09 +02:00
Makefile_32.cpu
Makefile.um