From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
kvm@vger.kernel.org, Jim Mattson <jmattson@google.com>
Cc: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com,
jpoimboe@kernel.org, kai.huang@intel.com,
linux-kernel@vger.kernel.org, mingo@redhat.com,
pawan.kumar.gupta@linux.intel.com, pbonzini@redhat.com,
sandipan.das@amd.com, tglx@linutronix.de, x86@kernel.org
Subject: Re: [PATCH v5 0/4] Distinguish between variants of IBPB
Date: Thu, 31 Oct 2024 12:51:33 -0700 [thread overview]
Message-ID: <173039500211.1507616.16831780895322741303.b4-ty@google.com> (raw)
In-Reply-To: <20241011214353.1625057-1-jmattson@google.com>
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
next prev parent reply other threads:[~2024-10-31 19:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-11 21:43 Jim Mattson
2024-10-11 21:43 ` [PATCH v5 1/4] x86/cpufeatures: Clarify semantics of X86_FEATURE_IBPB Jim Mattson
2024-10-11 21:43 ` [PATCH v5 2/4] x86/cpufeatures: Define X86_FEATURE_AMD_IBPB_RET Jim Mattson
2024-10-11 21:43 ` [PATCH v5 3/4] KVM: x86: Advertise AMD_IBPB_RET to userspace Jim Mattson
2024-10-11 21:43 ` [PATCH v5 4/4] KVM: x86: AMD's IBPB is not equivalent to Intel's IBPB Jim Mattson
2024-10-14 15:48 ` Tom Lendacky
2024-10-31 19:51 ` Sean Christopherson [this message]
2024-11-01 15:40 ` [PATCH v5 0/4] Distinguish between variants of IBPB Borislav Petkov
2024-11-01 16:03 ` Sean Christopherson
2024-11-01 19:28 ` Sean Christopherson
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