mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-16 12:31:52 -04:00
Code Issues Packages Projects Releases Wiki Activity

KVM: selftests: Fix reserved value WRMSR testcase for multi-feature MSRs

Browse Source 
When determining whether or not a WRMSR with reserved bits will #GP or
succeed due to the WRMSR not existing per the guest virtual CPU model,
expect failure if and only if _all_ features associated with the MSR are
unsupported.  Checking only the primary feature results in false failures
when running on AMD and Hygon CPUs with only one of RDPID or RDTSCP, as
AMD/Hygon CPUs ignore MSR_TSC_AUX[63:32], i.e. don't treat the bits as
reserved, and so #GP only if the MSR is unsupported.

Fixes: 9c38ddb3df ("KVM: selftests: Add an MSR test to exercise guest/host and read/write")
Reported-by: Zhiquan Li <zhiquan_li@163.com>
Closes: https://lore.kernel.org/all/20260209041305.64906-6-zhiquan_li@163.com
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260212103841.171459-5-zhiquan_li@163.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2026-02-12 18:38:41 +08:00
parent 6b8b11ba47
commit 9396cc1e28
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
tools/testing/selftests/kvm/x86/msrs_test.c
View File

@@ -175,7 +175,7 @@ void guest_test_reserved_val(const struct kvm_msr *msr)
* If the CPU will truncate the written value (e.g. SYSENTER on AMD),
* expect success and a truncated value, not #GP.
*/
if (!this_cpu_has(msr->feature) ||
if ((!this_cpu_has(msr->feature) && !this_cpu_has(msr->feature2)) ||
msr->rsvd_val == fixup_rdmsr_val(msr->index, msr->rsvd_val)) {
u8 vec = wrmsr_safe(msr->index, msr->rsvd_val);