On Fri, 11 Oct 2024 14:43:49 -0700, Jim Mattson wrote:
> Prior to Zen4, AMD's IBPB did not flush the RAS (or, in Intel
> terminology, the RSB). Hence, the older version of AMD's IBPB was not
> equivalent to Intel's IBPB. However, KVM has been treating them as
> equivalent, synthesizing Intel's CPUID.(EAX=7,ECX=0):EDX[bit 26] on any
> platform that supports the synthetic features X86_FEATURE_IBPB and
> X86_FEATURE_IBRS.
>
> [...]
Applied to kvm-x86 misc, thanks!
[1/4] x86/cpufeatures: Clarify semantics of X86_FEATURE_IBPB
https://github.com/kvm-x86/linux/commit/43801a0dbb38
[2/4] x86/cpufeatures: Define X86_FEATURE_AMD_IBPB_RET
https://github.com/kvm-x86/linux/commit/99d252e3ae3e
[3/4] KVM: x86: Advertise AMD_IBPB_RET to userspace
https://github.com/kvm-x86/linux/commit/df9328b0ef66
[4/4] KVM: x86: AMD's IBPB is not equivalent to Intel's IBPB
https://github.com/kvm-x86/linux/commit/d66e266427e4
--
https://github.com/kvm-x86/linux/tree/next
