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.
next prev parent 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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