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From: Paolo Bonzini <pbonzini@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>
Cc: Jing Liu <jing2.liu@linux.intel.com>,
	Yang Zhong <yang.zhong@intel.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 0/6] x86/fpu: Preparatory changes for guest AMX support
Date: Tue, 14 Dec 2021 11:42:36 +0100	[thread overview]
Message-ID: <09e06d62-33f5-b41f-e913-a8c5e43ba881@redhat.com> (raw)
In-Reply-To: <20211214022825.563892248@linutronix.de>

On 12/14/21 03:50, Thomas Gleixner wrote:
> The only remaining issue is the KVM XSTATE save/restore size checking which
> probably requires some FPU core assistance. But that requires some more
> thoughts vs. the IOCTL interface extension and once that is settled it
> needs to be solved in one go. But that's an orthogonal issue to the above.

That's not a big deal because KVM uses the uncompacted format.  So 
KVM_CHECK_EXTENSION and KVM_GET_XSAVE can just use CPUID to retrieve the 
size and uncompacted offset of the largest bit that is set in 
kvm_supported_xcr0, while KVM_SET_XSAVE can do the same with the largest 
bit that is set in the xstate_bv.

Paolo



> The series is also available from git:
> 
>     git://git.kernel.org/pub/scm/linux/kernel/git/people/tglx/devel.git x86/fpu-kvm


  parent reply	other threads:[~2021-12-14 10:42 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
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 [this message]
2021-12-14 13:24   ` Thomas Gleixner

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