From: John Allen <john.allen@amd.com>
To: Chao Gao <chao.gao@intel.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, tglx@linutronix.de, dave.hansen@intel.com,
seanjc@google.com, pbonzini@redhat.com, peterz@infradead.org,
rick.p.edgecombe@intel.com, weijiang.yang@intel.com,
bp@alien8.de, chang.seok.bae@intel.com, xin3.li@intel.com,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Maxim Levitsky <mlevitsk@redhat.com>,
Mitchell Levy <levymitchell0@gmail.com>,
Vignesh Balasubramanian <vigbalas@amd.com>
Subject: Re: [PATCH v8 5/6] x86/fpu/xstate: Introduce "guest-only" supervisor xfeature set
Date: Fri, 30 May 2025 11:04:53 -0500 [thread overview]
Message-ID: <aDnXJS37+sOtDIrV@AUSJOHALLEN.amd.com> (raw)
In-Reply-To: <20250522151031.426788-6-chao.gao@intel.com>
On Thu, May 22, 2025 at 08:10:08AM -0700, Chao Gao wrote:
> From: Yang Weijiang <weijiang.yang@intel.com>
>
> In preparation for upcoming CET virtualization support, the CET supervisor
> state will be added as a "guest-only" feature, since it is required only by
> KVM (i.e., guest FPUs). Establish the infrastructure for "guest-only"
> features.
>
> Define a new XFEATURE_MASK_GUEST_SUPERVISOR mask to specify features that
> are enabled by default in guest FPUs but not in host FPUs. Specifically,
> for any bit in this set, permission is granted and XSAVE space is allocated
> during vCPU creation. Non-guest FPUs cannot enable guest-only features,
> even dynamically, and no XSAVE space will be allocated for them.
>
> The mask is currently empty, but this will be changed by a subsequent
> patch.
>
> Co-developed-by: Chao Gao <chao.gao@intel.com>
> Signed-off-by: Chao Gao <chao.gao@intel.com>
> Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
> Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: John Allen <john.allen@amd.com>
next prev parent reply other threads:[~2025-05-30 16:05 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-22 15:10 [PATCH v8 0/6] Introduce CET supervisor state support Chao Gao
2025-05-22 15:10 ` [PATCH v8 1/6] x86/fpu/xstate: Differentiate default features for host and guest FPUs Chao Gao
2025-05-29 20:59 ` John Allen
2025-05-22 15:10 ` [PATCH v8 2/6] x86/fpu: Initialize guest FPU permissions from guest defaults Chao Gao
2025-05-29 21:14 ` John Allen
2025-05-22 15:10 ` [PATCH v8 3/6] x86/fpu: Initialize guest fpstate and FPU pseudo container " Chao Gao
2025-05-29 21:25 ` John Allen
2025-05-22 15:10 ` [PATCH v8 4/6] x86/fpu: Remove xfd argument from __fpstate_reset() Chao Gao
2025-05-29 21:26 ` John Allen
2025-05-22 15:10 ` [PATCH v8 5/6] x86/fpu/xstate: Introduce "guest-only" supervisor xfeature set Chao Gao
2025-05-30 16:04 ` John Allen [this message]
2025-05-22 15:10 ` [PATCH v8 6/6] x86/fpu/xstate: Add CET supervisor xfeature support as a guest-only feature Chao Gao
2025-05-30 16:05 ` John Allen
2025-05-23 16:57 ` [PATCH v8 0/6] Introduce CET supervisor state support Sean Christopherson
2025-05-23 17:12 ` Dave Hansen
2025-05-23 17:48 ` Sean Christopherson
2025-05-27 11:01 ` Chao Gao
2025-06-02 19:12 ` Chang S. Bae
2025-06-03 6:22 ` Chao Gao
2025-06-03 18:32 ` Chang S. Bae
2025-06-04 0:56 ` Chao Gao
2025-06-04 18:45 ` Dave Hansen
2025-06-16 8:08 ` Chao Gao
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