From: Jim Mattson <jmattson@google.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Jim Mattson <jmattson@google.com>,
Sandipan Das <sandipan.das@amd.com>,
Kai Huang <kai.huang@intel.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Subject: [PATCH v4 2/3] KVM: x86: Advertise AMD_IBPB_RET to userspace
Date: Fri, 13 Sep 2024 10:32:28 -0700 [thread overview]
Message-ID: <20240913173242.3271406-3-jmattson@google.com> (raw)
In-Reply-To: <20240913173242.3271406-1-jmattson@google.com>
This is an inherent feature of IA32_PRED_CMD[0], so it is trivially
virtualizable (as long as IA32_PRED_CMD[0] is virtualized).
Suggested-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
---
arch/x86/kvm/cpuid.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 2617be544480..ec7b2ca3b4d3 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -751,7 +751,7 @@ void kvm_set_cpu_caps(void)
F(CLZERO) | F(XSAVEERPTR) |
F(WBNOINVD) | F(AMD_IBPB) | F(AMD_IBRS) | F(AMD_SSBD) | F(VIRT_SSBD) |
F(AMD_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON) |
- F(AMD_PSFD)
+ F(AMD_PSFD) | F(AMD_IBPB_RET)
);
/*
--
2.46.0.662.g92d0881bb0-goog
next prev parent reply other threads:[~2024-09-13 17:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-13 17:32 [PATCH v4 0/3] Distinguish between variants of IBPB Jim Mattson
2024-09-13 17:32 ` [PATCH v4 1/3] x86/cpufeatures: Define X86_FEATURE_AMD_IBPB_RET Jim Mattson
2024-10-07 14:30 ` Borislav Petkov
2024-10-07 17:38 ` Jim Mattson
2024-09-13 17:32 ` Jim Mattson [this message]
2024-09-13 17:32 ` [PATCH v4 3/3] KVM: x86: AMD's IBPB is not equivalent to Intel's IBPB Jim Mattson
2024-09-27 18:52 ` [PATCH v4 0/3] Distinguish between variants of IBPB Jim Mattson
2024-09-30 16:19 ` Sean Christopherson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240913173242.3271406-3-jmattson@google.com \
--to=jmattson@google.com \
--cc=bp@alien8.de \
--cc=dave.hansen@linux.intel.com \
--cc=hpa@zytor.com \
--cc=jpoimboe@kernel.org \
--cc=kai.huang@intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=pawan.kumar.gupta@linux.intel.com \
--cc=pbonzini@redhat.com \
--cc=sandipan.das@amd.com \
--cc=seanjc@google.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®