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From: Thomas Gleixner <tglx@linutronix.de>
To: "Liu, Jing2" <jing2.liu@linux.intel.com>,
	LKML <linux-kernel@vger.kernel.org>
Cc: Yang Zhong <yang.zhong@intel.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	x86@kernel.org, kvm@vger.kernel.org,
	Sean Christoperson <seanjc@google.com>,
	Jin Nakajima <jun.nakajima@intel.com>,
	Kevin Tian <kevin.tian@intel.com>
Subject: Re: [patch 6/6] x86/fpu: Provide kvm_sync_guest_vmexit_xfd_state()
Date: Wed, 15 Dec 2021 10:49:18 +0100	[thread overview]
Message-ID: <87ee6erye9.ffs@tglx> (raw)
In-Reply-To: <62cc7ba5-8a46-2396-e728-cf5902c22306@linux.intel.com>

Jing,

On Wed, Dec 15 2021 at 14:35, Jing2 Liu wrote:
> On 12/14/2021 10:50 AM, Thomas Gleixner wrote:
>> KVM can disable the write emulation for the XFD MSR when the vCPU's fpstate
>> is already correctly sized to reduce the overhead.
>>
>> When write emulation is disabled the XFD MSR state after a VMEXIT is
>> unknown and therefore not in sync with the software states in fpstate and
>> the per CPU XFD cache.
>>
>> Provide kvm_sync_guest_vmexit_xfd_state() which has to be invoked after a
>> VMEXIT before enabling interrupts when write emulation is disabled for the
>> XFD MSR.
> Thanks for this function.
>
> s/kvm_sync_guest_vmexit_xfd_state/fpu_sync_guest_vmexit_xfd_state
> in subject and changelog.

I clearly need more sleep.

  reply	other threads:[~2021-12-15  9:49 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-14  2:50 [patch 0/6] x86/fpu: Preparatory changes for guest AMX support Thomas Gleixner
2021-12-14  2:50 ` [patch 1/6] x86/fpu: Extend fpu_xstate_prctl() with guest permissions Thomas Gleixner
2021-12-14  5:13   ` Tian, Kevin
2021-12-14 10:37     ` Paolo Bonzini
2021-12-14  2:50 ` [patch 2/6] x86/fpu: Prepare guest FPU for dynamically enabled FPU features Thomas Gleixner
2021-12-14  2:50 ` [patch 3/6] x86/fpu: Make XFD initialization in __fpstate_reset() a function argument Thomas Gleixner
2021-12-14  2:50 ` [patch 4/6] x86/fpu: Add guest support to xfd_enable_feature() Thomas Gleixner
2021-12-14  6:05   ` Tian, Kevin
2021-12-14 10:21     ` Paolo Bonzini
2021-12-14 13:15       ` Thomas Gleixner
2021-12-15  5:46         ` Tian, Kevin
2021-12-15  9:53           ` Thomas Gleixner
2021-12-15 10:02             ` Tian, Kevin
2021-12-14  2:50 ` [patch 5/6] x86/fpu: Provide fpu_update_guest_xcr0/xfd() Thomas Gleixner
2021-12-14  6:25   ` Tian, Kevin
2021-12-14 15:09   ` Wang, Wei W
2021-12-14 15:40     ` Thomas Gleixner
2021-12-14 16:11       ` Wang, Wei W
2021-12-14 18:04         ` Thomas Gleixner
2021-12-14 19:07           ` Juan Quintela
2021-12-14 20:28             ` Thomas Gleixner
2021-12-14 21:35               ` Juan Quintela
2021-12-15  2:17                 ` Wang, Wei W
2021-12-15 10:09                   ` Thomas Gleixner
2021-12-15 10:27                     ` Paolo Bonzini
2021-12-15 10:41                       ` Paolo Bonzini
2021-12-16  1:00                         ` Tian, Kevin
2021-12-16  5:36                         ` Tian, Kevin
2021-12-16 21:07                           ` Paolo Bonzini
2021-12-16 10:21                         ` Tian, Kevin
2021-12-16 10:24                           ` Paolo Bonzini
2021-12-16 10:26                           ` Paolo Bonzini
2021-12-16 13:00                         ` Tian, Kevin
2021-12-16  1:04                       ` Tian, Kevin
2021-12-16  9:34                         ` Thomas Gleixner
2021-12-16  9:59                           ` Tian, Kevin
2021-12-16 14:12                             ` Thomas Gleixner
2021-12-17 15:33                               ` Tian, Kevin
2021-12-15  6:14   ` Tian, Kevin
2021-12-14  2:50 ` [patch 6/6] x86/fpu: Provide kvm_sync_guest_vmexit_xfd_state() Thomas Gleixner
2021-12-15  6:35   ` Liu, Jing2
2021-12-15  9:49     ` Thomas Gleixner [this message]
2021-12-14  6:50 ` [patch 0/6] x86/fpu: Preparatory changes for guest AMX support Tian, Kevin
2021-12-14  6:52 ` Liu, Jing2
2021-12-14  7:54   ` Tian, Kevin
2021-12-14 10:42 ` Paolo Bonzini
2021-12-14 13:24   ` Thomas Gleixner

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