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target/i386: Allow MCDT_NO if host supports

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MCDT_NO bit indicates HW contains the security fix and doesn't need to
be mitigated to avoid data-dependent behaviour for certain instructions.
It needs no hypervisor support. Treat it as supported regardless of what
KVM reports.

Signed-off-by: Tao Su <tao1.su@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-ID: <20230706054949.66556-4-tao1.su@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Tao Su 2023-07-06 13:49:46 +08:00 committed by Paolo Bonzini
parent 9dd8b71091
commit ba3709feaa
1 changed files with 4 additions and 0 deletions
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4
target/i386/kvm/kvm.c
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@ -432,6 +432,10 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t function,
uint32_t eax;
host_cpuid(7, 1, &eax, &unused, &unused, &unused);
ret |= eax & (CPUID_7_1_EAX_FZRM | CPUID_7_1_EAX_FSRS | CPUID_7_1_EAX_FSRC);
} else if (function == 7 && index == 2 && reg == R_EDX) {
uint32_t edx;
host_cpuid(7, 2, &unused, &unused, &unused, &edx);
ret |= edx & CPUID_7_2_EDX_MCDT_NO;
} else if (function == 0xd && index == 0 &&
(reg == R_EAX || reg == R_EDX)) {
/*