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From: Yang Weijiang <weijiang.yang@intel.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Yang Weijiang <weijiang.yang@intel.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	pbonzini@redhat.com, jmattson@google.com,
	yu.c.zhang@linux.intel.com
Subject: Re: [PATCH v11 4/9] KVM: VMX: Check CET dependencies on CR settings
Date: Fri, 24 Apr 2020 22:36:21 +0800	[thread overview]
Message-ID: <20200424143621.GI24039@local-michael-cet-test> (raw)
In-Reply-To: <20200423172032.GI17824@linux.intel.com>

On Thu, Apr 23, 2020 at 10:20:32AM -0700, Sean Christopherson wrote:
> On Thu, Mar 26, 2020 at 04:18:41PM +0800, Yang Weijiang wrote:
> > CR4.CET is master control bit for CET function.
> > There're mutual constrains between CR0.WP and CR4.CET, so need
> > to check the dependent bit while changing the control registers.
> > 
> > Note:
> > 1)The processor does not allow CR4.CET to be set if CR0.WP = 0,
> >   similarly, it does not allow CR0.WP to be cleared while
> >   CR4.CET = 1. In either case, KVM would inject #GP to guest.
> 
> Nit: the CET vs. WP dependency and #GP belongs in the "main" part of the
> changelog, as it's the crux of the patch.  Item (2) below is more along
> the lines of "note" material.
>
OK, will change it, thank you!
> > 
> > 2)SHSTK and IBT features share one control MSR:
> >   MSR_IA32_{U,S}_CET, which means it's difficult to hide
> >   one feature from another in the case of SHSTK != IBT,
> >   after discussed in community, it's agreed to allow guest
> >   control two features independently as it won't introduce
> >   security hole.
> > 
 > 

  reply	other threads:[~2020-04-24 14:34 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26  8:18 [PATCH v11 0/9] Introduce support for guest CET feature Yang Weijiang
2020-03-26  8:18 ` [PATCH v11 1/9] KVM: VMX: Introduce CET VMX fields and flags Yang Weijiang
2020-04-23 16:07   ` Sean Christopherson
2020-04-24 13:39     ` Yang Weijiang
2020-04-23 16:39   ` Sean Christopherson
2020-04-24 13:44     ` Yang Weijiang
2020-03-26  8:18 ` [PATCH v11 2/9] KVM: VMX: Set guest CET MSRs per KVM and host configuration Yang Weijiang
2020-04-23 16:27   ` Sean Christopherson
2020-04-24 14:07     ` Yang Weijiang
2020-04-24 14:55       ` Sean Christopherson
2020-04-25  9:14         ` Yang Weijiang
2020-04-25 13:26     ` Paolo Bonzini
2020-04-26 15:26       ` Yang Weijiang
2020-03-26  8:18 ` [PATCH v11 3/9] KVM: VMX: Set host/guest CET states for vmexit/vmentry Yang Weijiang
2020-04-01  2:23   ` kbuild test robot
2020-04-23 17:17   ` Sean Christopherson
2020-04-24 14:35     ` Yang Weijiang
2020-04-24 14:49       ` Sean Christopherson
2020-04-25  9:20         ` Yang Weijiang
2020-04-27 17:04           ` Sean Christopherson
2020-04-27 17:56             ` Sean Christopherson
2020-03-26  8:18 ` [PATCH v11 4/9] KVM: VMX: Check CET dependencies on CR settings Yang Weijiang
2020-04-23 17:20   ` Sean Christopherson
2020-04-24 14:36     ` Yang Weijiang [this message]
2020-03-26  8:18 ` [PATCH v11 5/9] KVM: X86: Refresh CPUID once guest XSS MSR changes Yang Weijiang
2020-04-01  3:50   ` kbuild test robot
2020-04-23 17:34   ` Sean Christopherson
2020-04-24 14:47     ` Yang Weijiang
2020-04-25 13:19     ` Paolo Bonzini
2020-04-26 15:01       ` Yang Weijiang
2020-03-26  8:18 ` [PATCH v11 6/9] KVM: X86: Load guest fpu state when access MSRs managed by XSAVES Yang Weijiang
2020-03-26  8:18 ` [PATCH v11 7/9] KVM: X86: Add userspace access interface for CET MSRs Yang Weijiang
2020-03-28  7:40   ` kbuild test robot
2020-04-01  4:54   ` kbuild test robot
2020-04-23 18:14   ` Sean Christopherson
2020-04-24 15:02     ` Yang Weijiang
2020-04-24 15:10       ` Sean Christopherson
2020-04-25  9:28         ` Yang Weijiang
2020-04-25 15:31   ` Paolo Bonzini
2020-04-26 15:23     ` Yang Weijiang
2020-04-27 14:04       ` Paolo Bonzini
2020-04-28 13:41         ` Yang Weijiang
2020-03-26  8:18 ` [PATCH v11 8/9] KVM: VMX: Enable CET support for nested VM Yang Weijiang
2020-04-01  6:11   ` kbuild test robot
2020-04-23 18:29   ` Sean Christopherson
2020-04-24 15:24     ` Yang Weijiang
2020-03-26  8:18 ` [PATCH v11 9/9] KVM: X86: Set CET feature bits for CPUID enumeration Yang Weijiang
2020-03-27  4:41   ` kbuild test robot
2020-04-23 16:56   ` Sean Christopherson
2020-04-24 14:17     ` Yang Weijiang
2020-04-23 16:58   ` Sean Christopherson
2020-04-24 14:23     ` Yang Weijiang
2020-03-26  8:18 ` [kvm-unit-tests PATCH] x86: Add tests for user-mode CET Yang Weijiang
2020-04-23 15:51 ` [PATCH v11 0/9] Introduce support for guest CET feature Sean Christopherson
2020-04-24 13:31   ` Yang Weijiang
2020-04-23 16:03 ` Sean Christopherson
2020-04-24 13:34   ` Yang Weijiang

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