From: Dave Hansen <dave.hansen@intel.com>
To: Chao Gao <chao.gao@intel.com>,
tglx@linutronix.de, x86@kernel.org, seanjc@google.com,
pbonzini@redhat.com, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org
Cc: peterz@infradead.org, rick.p.edgecombe@intel.com,
weijiang.yang@intel.com, john.allen@amd.com, bp@alien8.de
Subject: Re: [PATCH v3 04/10] x86/fpu/xstate: Correct guest fpstate size calculation
Date: Fri, 7 Mar 2025 09:53:40 -0800 [thread overview]
Message-ID: <4e18ddd0-a122-449b-bbbd-aeed3475a324@intel.com> (raw)
In-Reply-To: <20250307164123.1613414-5-chao.gao@intel.com>
On 3/7/25 08:41, Chao Gao wrote:
> Note that this issue does not cause any functional problems because the
> guest fpstate is allocated using vmalloc(), which aligns the size to a
> full page, providing enough space for all existing supervisor components.
> On Emerald Rapids CPUs, the guest fpstate after this correction is ~2880
> bytes.
How about we move up the fpstate pointers at allocation time so they
just scrape the end of the vmalloc buffer? Basically, move the
page-alignment padding to the beginning of the first page instead of the
end of the last page.
next prev parent reply other threads:[~2025-03-07 17:53 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-07 16:41 [PATCH v3 00/10] Introduce CET supervisor state support Chao Gao
2025-03-07 16:41 ` [PATCH v3 01/10] x86/fpu/xstate: Always preserve non-user xfeatures/flags in __state_perm Chao Gao
2025-03-07 16:41 ` [PATCH v3 02/10] x86/fpu/xstate: Drop @perm from guest pseudo FPU container Chao Gao
2025-03-07 16:41 ` [PATCH v3 03/10] x86/fpu/xstate: Correct xfeatures cache in guest pseudo fpu container Chao Gao
2025-03-07 17:48 ` Dave Hansen
2025-03-08 2:44 ` Chao Gao
2025-03-07 16:41 ` [PATCH v3 04/10] x86/fpu/xstate: Correct guest fpstate size calculation Chao Gao
2025-03-07 17:53 ` Dave Hansen [this message]
2025-03-08 2:56 ` Chao Gao
2025-03-07 21:37 ` Chang S. Bae
2025-03-08 2:49 ` Chao Gao
2025-03-09 22:06 ` Chang S. Bae
2025-03-10 1:33 ` Chao Gao
2025-03-10 5:21 ` Chang S. Bae
2025-03-10 7:06 ` Chao Gao
2025-03-10 17:33 ` Chang S. Bae
2025-03-11 12:09 ` Chao Gao
2025-03-12 1:03 ` Chang S. Bae
2025-03-07 16:41 ` [PATCH v3 05/10] x86/fpu/xstate: Introduce guest FPU configuration Chao Gao
2025-03-07 18:06 ` Dave Hansen
2025-03-08 3:00 ` Chao Gao
2025-03-07 16:41 ` [PATCH v3 06/10] x86/fpu/xstate: Initialize guest perm with fpu_guest_cfg Chao Gao
2025-03-07 18:14 ` Dave Hansen
2025-03-08 3:14 ` Chao Gao
2025-03-07 16:41 ` [PATCH v3 07/10] x86/fpu/xstate: Initialize guest fpstate with fpu_guest_config Chao Gao
2025-03-07 18:41 ` Dave Hansen
2025-03-08 3:38 ` Chao Gao
2025-03-07 16:41 ` [PATCH v3 08/10] x86/fpu/xstate: Add CET supervisor xfeature support Chao Gao
2025-03-07 18:39 ` Dave Hansen
2025-03-08 3:24 ` Chao Gao
2025-03-07 16:41 ` [PATCH v3 09/10] x86/fpu/xstate: Introduce XFEATURE_MASK_KERNEL_DYNAMIC xfeature set Chao Gao
2025-03-09 22:06 ` Chang S. Bae
2025-03-10 3:49 ` Chao Gao
2025-03-10 5:20 ` Chang S. Bae
2025-03-10 5:53 ` Chao Gao
2025-03-11 12:27 ` Chao Gao
2025-03-12 1:03 ` Chang S. Bae
2025-03-07 16:41 ` [PATCH v3 10/10] x86/fpu/xstate: Warn if CET supervisor state is detected in normal fpstate Chao Gao
2025-03-07 19:09 ` [PATCH v3 00/10] Introduce CET supervisor state support Dave Hansen
2025-03-18 15:24 ` Chao Gao
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