From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Yang Weijiang <weijiang.yang@intel.com>
Cc: 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 2/9] KVM: VMX: Set guest CET MSRs per KVM and host configuration
Date: Fri, 24 Apr 2020 07:55:29 -0700 [thread overview]
Message-ID: <20200424145529.GD30013@linux.intel.com> (raw)
In-Reply-To: <20200424140751.GE24039@local-michael-cet-test>
On Fri, Apr 24, 2020 at 10:07:51PM +0800, Yang Weijiang wrote:
> On Thu, Apr 23, 2020 at 09:27:49AM -0700, Sean Christopherson wrote:
> > On Thu, Mar 26, 2020 at 04:18:39PM +0800, Yang Weijiang wrote:
> > > @@ -7102,6 +7138,10 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
> > > vmx_set_guest_msr(vmx, msr, enabled ? 0 : TSX_CTRL_RTM_DISABLE);
> > > }
> > > }
> > > +
> > > + if (guest_cpuid_has(vcpu, X86_FEATURE_SHSTK) ||
> > > + guest_cpuid_has(vcpu, X86_FEATURE_IBT))
> > > + vmx_update_intercept_for_cet_msr(vcpu);
> >
> > This is wrong, it will miss the case where userspace double configures CPUID
> > and goes from CET=1 to CET=0. This should instead be:
> >
> > if (supported_xss & (XFEATURE_MASK_CET_KERNEL | XFEATURE_MASK_CET_USER))
> > vmx_update_intercept_for_cet_msr(vcpu);
> >
> > > }
> Here CET=1/0, did you mean the CET bit in XSS or CR4.CET? If it's the
> former, then it's OK for me.
The former, i.e. update the CET MSRs if KVM supports CET virtualization and
the guest's CPUID configuration is changing.
next prev parent reply other threads:[~2020-04-24 14:55 UTC|newest]
Thread overview: 63+ 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 [this message]
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
2020-04-01 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
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
2020-04-01 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
2020-03-28 7:40 ` kbuild test robot
2020-04-01 4:54 ` 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
2020-04-01 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
2020-03-27 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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