From: Paolo Bonzini <pbonzini@redhat.com>
To: Yang Weijiang <weijiang.yang@intel.com>,
seanjc@google.com, peterz@infradead.org, john.allen@amd.com,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: rick.p.edgecombe@intel.com, chao.gao@intel.com,
binbin.wu@linux.intel.com
Subject: Re: [PATCH v5 17/19] KVM:x86: Enable guest CET supervisor xstate bit support
Date: Sat, 5 Aug 2023 00:02:28 +0200 [thread overview]
Message-ID: <3075190f-d8a5-0d7d-56e9-671a2052d20f@redhat.com> (raw)
In-Reply-To: <20230803042732.88515-18-weijiang.yang@intel.com>
On 8/3/23 06:27, Yang Weijiang wrote:
> if (boot_cpu_has(X86_FEATURE_XSAVES)) {
> + u32 eax, ebx, ecx, edx;
> +
> + cpuid_count(0xd, 1, &eax, &ebx, &ecx, &edx);
> rdmsrl(MSR_IA32_XSS, host_xss);
> kvm_caps.supported_xss = host_xss & KVM_SUPPORTED_XSS;
> + if (ecx & XFEATURE_MASK_CET_KERNEL)
> + kvm_caps.supported_xss |= XFEATURE_MASK_CET_KERNEL;
> }
This is a bit hackish and makes me lean more towards adding support for
XFEATURE_MASK_CET_KERNEL in host MSR_IA32_XSS (and then possibly hide it
in the actual calls to XSAVE/XRSTORS for non-guest FPU).
Paolo
next prev parent reply other threads:[~2023-08-04 22:03 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-03 4:27 [PATCH v5 00/19] Enable CET Virtualization Yang Weijiang
2023-08-03 4:27 ` [PATCH v5 01/19] x86/cpufeatures: Add CPU feature flags for shadow stacks Yang Weijiang
2023-08-03 4:27 ` [PATCH v5 02/19] x86/fpu/xstate: Introduce CET MSR and XSAVES supervisor states Yang Weijiang
2023-08-03 4:27 ` [PATCH v5 03/19] KVM:x86: Report XSS as to-be-saved if there are supported features Yang Weijiang
2023-08-03 4:27 ` [PATCH v5 04/19] KVM:x86: Refresh CPUID on write to guest MSR_IA32_XSS Yang Weijiang
2023-08-04 16:02 ` Sean Christopherson
2023-08-04 21:43 ` Paolo Bonzini
2023-08-09 3:11 ` Yang, Weijiang
2023-08-08 14:20 ` Yang, Weijiang
2023-08-04 18:27 ` Sean Christopherson
2023-08-07 6:55 ` Paolo Bonzini
2023-08-09 8:56 ` Yang, Weijiang
2023-08-10 0:01 ` Paolo Bonzini
2023-08-10 1:12 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 05/19] KVM:x86: Initialize kvm_caps.supported_xss Yang Weijiang
2023-08-04 18:45 ` Sean Christopherson
2023-08-08 15:08 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 06/19] KVM:x86: Load guest FPU state when access XSAVE-managed MSRs Yang Weijiang
2023-08-03 4:27 ` [PATCH v5 07/19] KVM:x86: Add fault checks for guest CR4.CET setting Yang Weijiang
2023-08-03 9:07 ` Chao Gao
2023-08-03 4:27 ` [PATCH v5 08/19] KVM:x86: Report KVM supported CET MSRs as to-be-saved Yang Weijiang
2023-08-03 10:39 ` Chao Gao
2023-08-04 3:13 ` Yang, Weijiang
2023-08-04 5:51 ` Chao Gao
2023-08-04 18:51 ` Sean Christopherson
2023-08-04 22:01 ` Paolo Bonzini
2023-08-08 15:16 ` Yang, Weijiang
2023-08-06 8:54 ` Yang, Weijiang
2023-08-04 18:55 ` Sean Christopherson
2023-08-08 15:26 ` Yang, Weijiang
2023-08-04 21:47 ` Paolo Bonzini
2023-08-09 3:14 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 09/19] KVM:x86: Make guest supervisor states as non-XSAVE managed Yang Weijiang
2023-08-03 11:15 ` Chao Gao
2023-08-04 3:26 ` Yang, Weijiang
2023-08-04 20:45 ` Sean Christopherson
2023-08-04 20:59 ` Peter Zijlstra
2023-08-04 21:32 ` Paolo Bonzini
2023-08-09 2:51 ` Yang, Weijiang
2023-08-09 2:39 ` Yang, Weijiang
2023-08-10 9:29 ` Yang, Weijiang
2023-08-10 14:29 ` Dave Hansen
2023-08-10 15:15 ` Paolo Bonzini
2023-08-10 15:37 ` Sean Christopherson
2023-08-11 3:03 ` Yang, Weijiang
2023-08-28 21:00 ` Dave Hansen
2023-08-29 7:05 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 10/19] KVM:VMX: Introduce CET VMCS fields and control bits Yang Weijiang
2023-08-03 4:27 ` [PATCH v5 11/19] KVM:VMX: Emulate read and write to CET MSRs Yang Weijiang
2023-08-04 5:14 ` Chao Gao
2023-08-04 21:27 ` Sean Christopherson
2023-08-04 21:45 ` Paolo Bonzini
2023-08-04 22:21 ` Sean Christopherson
2023-08-07 7:03 ` Paolo Bonzini
2023-08-06 8:44 ` Yang, Weijiang
2023-08-07 7:00 ` Paolo Bonzini
2023-08-04 8:28 ` Chao Gao
2023-08-09 7:12 ` Yang, Weijiang
2023-08-04 21:40 ` Paolo Bonzini
2023-08-09 3:05 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 12/19] KVM:x86: Save and reload SSP to/from SMRAM Yang Weijiang
2023-08-04 7:53 ` Chao Gao
2023-08-04 15:25 ` Sean Christopherson
2023-08-06 9:14 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 13/19] KVM:VMX: Set up interception for CET MSRs Yang Weijiang
2023-08-04 8:16 ` Chao Gao
2023-08-06 9:22 ` Yang, Weijiang
2023-08-07 1:16 ` Chao Gao
2023-08-09 6:11 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 14/19] KVM:VMX: Set host constant supervisor states to VMCS fields Yang Weijiang
2023-08-04 8:23 ` Chao Gao
2023-08-03 4:27 ` [PATCH v5 15/19] KVM:x86: Optimize CET supervisor SSP save/reload Yang Weijiang
2023-08-04 8:43 ` Chao Gao
2023-08-09 9:00 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 16/19] KVM:x86: Enable CET virtualization for VMX and advertise to userspace Yang Weijiang
2023-08-03 4:27 ` [PATCH v5 17/19] KVM:x86: Enable guest CET supervisor xstate bit support Yang Weijiang
2023-08-04 22:02 ` Paolo Bonzini [this message]
2023-08-09 6:07 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 18/19] KVM:nVMX: Refine error code injection to nested VM Yang Weijiang
2023-08-04 21:38 ` Sean Christopherson
2023-08-09 3:00 ` Yang, Weijiang
2023-08-03 4:27 ` [PATCH v5 19/19] KVM:nVMX: Enable CET support for " Yang Weijiang
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