From: Tom Lendacky <thomas.lendacky@amd.com>
To: Ramakrishna Saripalli <rsaripal@amd.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] x86/kvm/svm: Implement support for PSFD
Date: Thu, 8 Apr 2021 12:19:52 -0500 [thread overview]
Message-ID: <6514c479-4b7b-4902-632e-54f3eaf436d4@amd.com> (raw)
In-Reply-To: <20210407194512.6922-1-rsaripal@amd.com>
On 4/7/21 2:45 PM, Ramakrishna Saripalli wrote:
> From: Ramakrishna Saripalli <rk.saripalli@amd.com>
>
> Expose Predictive Store Forwarding capability to guests.
> Guests enable or disable PSF via SPEC_CTRL MSR.
>
> Signed-off-by: Ramakrishna Saripalli <rk.saripalli@amd.com>
> ---
> arch/x86/kvm/cpuid.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 6bd2f8b830e4..9c4af0fef6d7 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -448,6 +448,8 @@ void kvm_set_cpu_caps(void)
> kvm_cpu_cap_set(X86_FEATURE_INTEL_STIBP);
> if (boot_cpu_has(X86_FEATURE_AMD_SSBD))
> kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL_SSBD);
> + if (boot_cpu_has(X86_FEATURE_AMD_PSFD))
> + kvm_cpu_cap_set(X86_FEATURE_AMD_PSFD);
>
> kvm_cpu_cap_mask(CPUID_7_1_EAX,
> F(AVX_VNNI) | F(AVX512_BF16)
> @@ -482,7 +484,7 @@ void kvm_set_cpu_caps(void)
> kvm_cpu_cap_mask(CPUID_8000_0008_EBX,
> 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_SSB_NO) | F(AMD_STIBP) | F(AMD_STIBP_ALWAYS_ON) | F(AMD_PSFD)
Please note that this patch has a pre-req against the PSFD support that
defines this feature:
https://lore.kernel.org/lkml/20210406155004.230790-2-rsaripal@amd.com/#t
Thanks,
Tom
> );
>
> /*
>
prev parent reply other threads:[~2021-04-08 17:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 19:45 [PATCH 1/1] x86/kvm/svm: Implement support for PSFD Ramakrishna Saripalli
2021-04-07 20:03 ` Sean Christopherson
2021-04-08 17:19 ` Tom Lendacky [this message]
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=6514c479-4b7b-4902-632e-54f3eaf436d4@amd.com \
--to=thomas.lendacky@amd.com \
--cc=bp@alien8.de \
--cc=hpa@zytor.com \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=pbonzini@redhat.com \
--cc=rsaripal@amd.com \
--cc=seanjc@google.com \
--cc=tglx@linutronix.de \
--cc=vkuznets@redhat.com \
--cc=wanpengli@tencent.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;
as well as URLs for NNTP newsgroup(s).