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| author | Jim Mattson <jmattson@google.com> | 2026-05-27 20:43:46 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2026-05-27 21:21:41 +0300 |
| commit | e93a93f11490992a477546d38d3a37b9b8dc6a5f (patch) | |
| tree | 933f821ecf65a12b7abc738a0ff07b29488b95c4 /scripts/objdiff | |
| parent | d1bc99885a59d89e408f52f4c147b07bca9a686f (diff) | |
| download | linux-e93a93f11490992a477546d38d3a37b9b8dc6a5f.tar.xz | |
KVM: x86: Virtualize AMD CPUID faulting
On AMD CPUs, CPUID faulting support is advertised via
CPUID.80000021H:EAX.CpuidUserDis[bit 17] and enabled by setting
HWCR.CpuidUserDis[bit 35].
Advertise the feature to userspace regardless of host CPU support. Allow
writes to HWCR to set bit 35 when the guest CPUID advertises
CpuidUserDis. Update cpuid_fault_enabled() to check HWCR.CpuidUserDis as
well as MSR_FEATURE_ENABLES.CPUID_GP_ON_CPL_GT_0.
Unlike VMX, SVM prioritizes the CPUID intercept over the #GP induced by
CPUID faulting.[1] This behavior has been confirmed on a Turin CPU (F/M/S
1AH/2/1).
Link: https://lore.kernel.org/r/DS7PR12MB82011943131DF5415365E19E940B2@DS7PR12MB8201.namprd12.prod.outlook.com [1]
Signed-off-by: Jim Mattson <jmattson@google.com>
Link: https://patch.msgid.link/20260527174347.2356165-5-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'scripts/objdiff')
0 files changed, 0 insertions, 0 deletions