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| author | Sean Christopherson <[email protected]> | 2024-08-02 18:55:08 +0000 |
|---|---|---|
| committer | Sean Christopherson <[email protected]> | 2024-11-01 16:22:34 +0000 |
| commit | a5d563890b8f0352c8f915c6acc75b5cd3b28d98 (patch) | |
| tree | 06f6aa0449205cd24a578176c07a73ce4f2c526c /rust/helpers/helpers.c | |
| parent | KVM: VMX: Remove restriction that PMU version > 0 for PERF_CAPABILITIES (diff) | |
| download | kernel-a5d563890b8f0352c8f915c6acc75b5cd3b28d98.tar.gz kernel-a5d563890b8f0352c8f915c6acc75b5cd3b28d98.zip | |
KVM: x86: Reject userspace attempts to access ARCH_CAPABILITIES w/o support
Reject userspace accesses to ARCH_CAPABILITIES if the MSR isn't supposed
to exist, according to guest CPUID. However, "reject" accesses with
KVM_MSR_RET_UNSUPPORTED, so that reads get '0' and writes of '0' are
ignored if KVM advertised support ARCH_CAPABILITIES.
KVM's ABI is that userspace must set guest CPUID prior to setting MSRs,
and that setting MSRs that aren't supposed exist is disallowed (modulo the
'0' exemption).
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>
Diffstat (limited to 'rust/helpers/helpers.c')
0 files changed, 0 insertions, 0 deletions