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,
mlevitsk@redhat.com, weijiang.yang@intel.com, john.allen@amd.com
Subject: Re: [PATCH v2 1/6] x86/fpu/xstate: Always preserve non-user xfeatures/flags in __state_perm
Date: Tue, 4 Mar 2025 14:20:31 -0800 [thread overview]
Message-ID: <ce5e2f44-144b-47bd-9f7e-02f61abed76a@intel.com> (raw)
In-Reply-To: <20241126101710.62492-2-chao.gao@intel.com>
On 11/26/24 02:17, Chao Gao wrote:
> When granting userspace or a KVM guest access to an xfeature, preserve the
> entity's existing supervisor and software-defined permissions as tracked
> by __state_perm, i.e. use __state_perm to track *all* permissions even
> though all supported supervisor xfeatures are granted to all FPUs and
> FPU_GUEST_PERM_LOCKED disallows changing permissions.
Should we document what __state_perm contains either in
fpu_state_perm or xstate_get_group_perm()?
Either way:
Acked-by: Dave Hansen <dave.hansen@intel.com>
next prev parent reply other threads:[~2025-03-04 22:20 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-26 10:17 [PATCH v2 0/6] Introduce CET supervisor state support Chao Gao
2024-11-26 10:17 ` [PATCH v2 1/6] x86/fpu/xstate: Always preserve non-user xfeatures/flags in __state_perm Chao Gao
2025-03-04 22:20 ` Dave Hansen [this message]
2025-03-05 8:25 ` Chao Gao
2024-11-26 10:17 ` [PATCH v2 2/6] x86/fpu/xstate: Add CET supervisor mode state support Chao Gao
2025-03-04 22:26 ` Dave Hansen
2025-03-05 8:32 ` Chao Gao
2024-11-26 10:17 ` [PATCH v2 3/6] x86/fpu/xstate: Introduce XFEATURE_MASK_KERNEL_DYNAMIC xfeature set Chao Gao
2025-03-04 22:37 ` Dave Hansen
2025-03-05 8:43 ` Chao Gao
2024-11-26 10:17 ` [PATCH v2 4/6] x86/fpu/xstate: Introduce fpu_guest_cfg for guest FPU configuration Chao Gao
2025-03-04 22:50 ` Dave Hansen
2025-03-05 8:57 ` Chao Gao
2024-11-26 10:17 ` [PATCH v2 5/6] x86/fpu/xstate: Create guest fpstate with guest specific config Chao Gao
2025-03-04 23:02 ` Dave Hansen
2025-03-05 9:04 ` Chao Gao
2024-11-26 10:17 ` [PATCH v2 6/6] x86/fpu/xstate: Warn if CET supervisor state is detected in normal fpstate Chao Gao
2024-11-26 10:28 ` [PATCH v2 0/6] Introduce CET supervisor state support Chao Gao
2025-01-11 1:26 ` Sean Christopherson
2025-02-11 2:09 ` Xin Li
2025-03-04 19:40 ` Xin Li
2025-03-04 19:53 ` Sean Christopherson
2025-02-19 1:44 ` Chao Gao
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