From: Sean Christopherson <seanjc@google.com>
To: "Yang, Weijiang" <weijiang.yang@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, rick.p.edgecombe@intel.com
Subject: Re: [PATCH 00/19] Refresh queued CET virtualization series
Date: Fri, 15 Jul 2022 15:58:16 +0000 [thread overview]
Message-ID: <YtGOmEeMW1BbC3Ne@google.com> (raw)
In-Reply-To: <950988cd-708c-af25-9d0e-47062aded504@intel.com>
On Fri, Jul 15, 2022, Yang, Weijiang wrote:
>
> On 7/15/2022 3:36 AM, Sean Christopherson wrote:
> > It's definitely uncommon; unless I'm forgetting features, LA57 is the only feature
> > that KVM fully virtualizes (as opposed to emulates in software) without requiring
> > host enablement. Ah, and good ol' MPX, which is probably the best prior are since
> > it shares the same XSAVE+VMCS for user+supervisor state management. So more than
> > one, but still not very many.
>
> Speaking of MPX, is it really active in recent kernel? I can find little
> piece of code at native side, instead, more code in KVM.
Nope, native MPX support was ripped out a year or two ago. The kernel provides
just enough save+restore support so that KVM can continue to virtualize MPX.
prev parent reply other threads:[~2022-07-15 15:58 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-16 8:46 [PATCH 00/19] Refresh queued CET virtualization series Yang Weijiang
2022-06-16 8:46 ` [PATCH 01/19] x86/cet/shstk: Add Kconfig option for Shadow Stack Yang Weijiang
2022-06-16 8:46 ` [PATCH 02/19] x86/cpufeatures: Add CPU feature flags for shadow stacks Yang Weijiang
2022-06-16 8:46 ` [PATCH 03/19] x86/cpufeatures: Enable CET CR4 bit for shadow stack Yang Weijiang
2022-06-16 10:24 ` Peter Zijlstra
2022-06-16 17:12 ` Edgecombe, Rick P
2022-06-17 11:38 ` Peter Zijlstra
2022-06-17 21:18 ` Edgecombe, Rick P
2022-06-16 10:25 ` Peter Zijlstra
2022-06-16 17:36 ` Edgecombe, Rick P
2022-06-16 8:46 ` [PATCH 04/19] x86/fpu/xstate: Introduce CET MSR and XSAVES supervisor states Yang Weijiang
2022-06-16 10:27 ` Peter Zijlstra
2022-06-16 17:12 ` Edgecombe, Rick P
2022-06-16 8:46 ` [PATCH 05/19] x86/fpu: Add helper for modifying xstate Yang Weijiang
2022-06-16 8:46 ` [PATCH 06/19] KVM: x86: Report XSS as an MSR to be saved if there are supported features Yang Weijiang
2022-06-16 8:46 ` [PATCH 07/19] KVM: x86: Refresh CPUID on writes to MSR_IA32_XSS Yang Weijiang
2022-06-16 8:46 ` [PATCH 08/19] KVM: x86: Load guest fpu state when accessing MSRs managed by XSAVES Yang Weijiang
2022-06-16 8:46 ` [PATCH 09/19] KVM: x86: Add #CP support in guest exception classification Yang Weijiang
2022-06-16 8:46 ` [PATCH 10/19] KVM: VMX: Introduce CET VMCS fields and flags Yang Weijiang
2022-06-16 8:46 ` [PATCH 11/19] KVM: x86: Add fault checks for CR4.CET Yang Weijiang
2022-06-16 8:46 ` [PATCH 12/19] KVM: VMX: Emulate reads and writes to CET MSRs Yang Weijiang
2022-06-16 8:46 ` [PATCH 13/19] KVM: VMX: Add a synthetic MSR to allow userspace VMM to access GUEST_SSP Yang Weijiang
2022-06-16 8:46 ` [PATCH 14/19] KVM: x86: Report CET MSRs as to-be-saved if CET is supported Yang Weijiang
2022-06-16 8:46 ` [PATCH 15/19] KVM: x86: Save/Restore GUEST_SSP to/from SMM state save area Yang Weijiang
2022-06-16 8:46 ` [PATCH 16/19] KVM: x86: Enable CET virtualization for VMX and advertise CET to userspace Yang Weijiang
2022-06-16 10:59 ` Peter Zijlstra
2022-06-16 15:27 ` Yang, Weijiang
2022-06-25 6:55 ` Yang, Weijiang
2022-06-16 8:46 ` [PATCH 17/19] KVM: VMX: Pass through CET MSRs to the guest when supported Yang Weijiang
2022-06-16 8:46 ` [PATCH 18/19] KVM: nVMX: Enable CET support for nested VMX Yang Weijiang
2022-06-16 8:46 ` [PATCH 19/19] KVM: x86: Enable supervisor IBT support for guest Yang Weijiang
2022-06-16 11:05 ` Peter Zijlstra
2022-06-16 11:19 ` Peter Zijlstra
2022-06-16 15:56 ` Yang, Weijiang
2022-06-16 9:10 ` [PATCH 00/19] Refresh queued CET virtualization series Christoph Hellwig
2022-06-16 11:25 ` Peter Zijlstra
2022-06-16 10:12 ` Peter Zijlstra
2022-06-16 10:21 ` Paolo Bonzini
2022-06-16 14:18 ` Peter Zijlstra
2022-06-16 15:06 ` Yang, Weijiang
2022-06-16 15:28 ` Paolo Bonzini
2022-06-18 6:43 ` Yang, Weijiang
2022-07-14 19:36 ` Sean Christopherson
2022-07-15 15:04 ` Yang, Weijiang
2022-07-15 15:58 ` Sean Christopherson [this message]
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