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From: Paolo Bonzini <pbonzini@redhat.com>
To: "Tian, Kevin" <kevin.tian@intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>
Cc: Jing Liu <jing2.liu@linux.intel.com>,
	"Zhong, Yang" <yang.zhong@intel.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>, "Christopherson,,
	Sean" <seanjc@google.com>,
	"Nakajima, Jun" <jun.nakajima@intel.com>
Subject: Re: [patch 1/6] x86/fpu: Extend fpu_xstate_prctl() with guest permissions
Date: Tue, 14 Dec 2021 11:37:39 +0100	[thread overview]
Message-ID: <10514d6f-672b-5f1e-3af0-6eb641845c32@redhat.com> (raw)
In-Reply-To: <BN9PR11MB5276B6158AC37CA38201D4308C759@BN9PR11MB5276.namprd11.prod.outlook.com>

On 12/14/21 06:13, Tian, Kevin wrote:
>>    2) Permissions are frozen when the first vCPU is created to ensure
>>       consistency. Any attempt to expand permissions via the prctl() after
>>       that point is rejected.
>
> A curiosity question. Do we allow the user to reduce permissions?

No, there's no prctl for that.

Paolo

  reply	other threads:[~2021-12-14 10:37 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 [this message]
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
2021-12-14 13:24   ` Thomas Gleixner

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