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| author | Tao Su <tao1.su@linux.intel.com> | 2023-07-06 13:49:46 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-07-07 12:52:27 +0200 |
| commit | ba3709feaab44631315e02cd793cfccae4c6bd2a (patch) | |
| tree | 3fd259f2cfcc7fad3fc40ae002bf16783230d1f7 | |
| parent | 9dd8b71091f47bac395f543779269c14d8d93c60 (diff) | |
| download | qemu-ba3709feaab44631315e02cd793cfccae4c6bd2a.zip qemu-ba3709feaab44631315e02cd793cfccae4c6bd2a.tar.gz qemu-ba3709feaab44631315e02cd793cfccae4c6bd2a.tar.bz2 | |
target/i386: Allow MCDT_NO if host supports
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>
| -rw-r--r-- | target/i386/kvm/kvm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index de53184..ebfaf3d 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -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)) { /* |