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From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Chao Gao <chao.gao@intel.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: acme@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
	hpa@zytor.com, john.allen@amd.com, mingo@kernel.org,
	mingo@redhat.com, minipli@grsecurity.net, mlevitsk@redhat.com,
	namhyung@kernel.org, pbonzini@redhat.com, prsampat@amd.com,
	rick.p.edgecombe@intel.com, seanjc@google.com, shuah@kernel.org,
	tglx@linutronix.de, weijiang.yang@intel.com, x86@kernel.org,
	xin@zytor.com
Subject: Re: [PATCH v14 01/22] KVM: x86: Introduce KVM_{G,S}ET_ONE_REG uAPIs support
Date: Wed, 10 Sep 2025 17:03:46 +0800	[thread overview]
Message-ID: <9ccedee3-28aa-4a89-955a-204de8bcbb0f@intel.com> (raw)
In-Reply-To: <20250909093953.202028-2-chao.gao@intel.com>

On 9/9/2025 5:39 PM, Chao Gao wrote:
> From: Yang Weijiang <weijiang.yang@intel.com>
> 
> Enable KVM_{G,S}ET_ONE_REG uAPIs so that userspace can access MSRs and
> other non-MSR registers through them.
> 
> This is in preparation for allowing userspace to read/write the guest SSP
> register, which is needed for the upcoming CET virtualization support.
> 
> Currently, two types of registers are supported: KVM_X86_REG_TYPE_MSR and
> KVM_X86_REG_TYPE_KVM. All MSRs are in the former type; the latter type is
> added for registers that lack existing KVM uAPIs to access them. The "KVM"
> in the name is intended to be vague to give KVM flexibility to include
> other potential registers. We considered some specific names, like
> "SYNTHETIC" and "SYNTHETIC_MSR" before, but both are confusing and may put
> KVM itself into a corner.
> 
> Suggested-by: Sean Christopherson <seanjc@google.com>
> Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
> Link: https://lore.kernel.org/all/20240219074733.122080-18-weijiang.yang@intel.com/ [1]
> Tested-by: Mathias Krause <minipli@grsecurity.net>
> Tested-by: John Allen <john.allen@amd.com>
> Tested-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
> Signed-off-by: Chao Gao <chao.gao@intel.com>

Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>

  reply	other threads:[~2025-09-10  9:04 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-09  9:39 [PATCH v14 00/22] Enable CET Virtualization Chao Gao
2025-09-09  9:39 ` [PATCH v14 01/22] KVM: x86: Introduce KVM_{G,S}ET_ONE_REG uAPIs support Chao Gao
2025-09-10  9:03   ` Xiaoyao Li [this message]
2025-09-10 17:17   ` Sean Christopherson
2025-09-10 17:35   ` Sean Christopherson
2025-09-09  9:39 ` [PATCH v14 02/22] KVM: x86: Report XSS as to-be-saved if there are supported features Chao Gao
2025-09-11  6:52   ` Binbin Wu
2025-09-09  9:39 ` [PATCH v14 03/22] KVM: x86: Check XSS validity against guest CPUIDs Chao Gao
2025-09-10  9:22   ` Xiaoyao Li
2025-09-10 11:33     ` Chao Gao
2025-09-10 18:47       ` Sean Christopherson
2025-09-09  9:39 ` [PATCH v14 04/22] KVM: x86: Refresh CPUID on write to guest MSR_IA32_XSS Chao Gao
2025-09-10  9:23   ` Xiaoyao Li
2025-09-11  7:02   ` Binbin Wu
2025-09-09  9:39 ` [PATCH v14 05/22] KVM: x86: Initialize kvm_caps.supported_xss Chao Gao
2025-09-10  9:36   ` Xiaoyao Li
2025-09-09  9:39 ` [PATCH v14 06/22] KVM: x86: Load guest FPU state when access XSAVE-managed MSRs Chao Gao
2025-09-10  9:37   ` Xiaoyao Li
2025-09-10 11:18     ` Chao Gao
2025-09-10 13:46       ` Xiaoyao Li
2025-09-10 15:24         ` Chao Gao
2025-09-10 17:50       ` Sean Christopherson
2025-09-09  9:39 ` [PATCH v14 07/22] KVM: x86: Add fault checks for guest CR4.CET setting Chao Gao
2025-09-10  9:38   ` Xiaoyao Li
2025-09-09  9:39 ` [PATCH v14 08/22] KVM: x86: Report KVM supported CET MSRs as to-be-saved Chao Gao
2025-09-09  9:39 ` [PATCH v14 09/22] KVM: VMX: Introduce CET VMCS fields and control bits Chao Gao
2025-09-09  9:39 ` [PATCH v14 10/22] KVM: x86: Enable guest SSP read/write interface with new uAPIs Chao Gao
2025-09-09  9:39 ` [PATCH v14 11/22] KVM: VMX: Emulate read and write to CET MSRs Chao Gao
2025-09-11  8:05   ` Xiaoyao Li
2025-09-11  9:02     ` Chao Gao
2025-09-11 20:24       ` Sean Christopherson
2025-09-09  9:39 ` [PATCH v14 12/22] KVM: x86: Save and reload SSP to/from SMRAM Chao Gao
2025-09-09  9:39 ` [PATCH v14 13/22] KVM: VMX: Set up interception for CET MSRs Chao Gao
2025-09-09  9:39 ` [PATCH v14 14/22] KVM: VMX: Set host constant supervisor states to VMCS fields Chao Gao
2025-09-12 22:04   ` Sean Christopherson
2025-09-09  9:39 ` [PATCH v14 15/22] KVM: x86: Don't emulate instructions guarded by CET Chao Gao
2025-09-11  9:18   ` Xiaoyao Li
2025-09-11 10:42     ` Chao Gao
2025-09-12  6:23       ` Xiaoyao Li
2025-09-12 14:37         ` Sean Christopherson
2025-09-12 15:11           ` Sean Christopherson
2025-09-16 14:42             ` Chao Gao
2025-09-12 14:42   ` Sean Christopherson
2025-09-09  9:39 ` [PATCH v14 16/22] KVM: x86: Enable CET virtualization for VMX and advertise to userspace Chao Gao
2025-09-09  9:39 ` [PATCH v14 17/22] KVM: nVMX: Virtualize NO_HW_ERROR_CODE_CC for L1 event injection to L2 Chao Gao
2025-09-09  9:39 ` [PATCH v14 18/22] KVM: nVMX: Prepare for enabling CET support for nested guest Chao Gao
2025-09-09  9:39 ` [PATCH v14 19/22] KVM: nVMX: Add consistency checks for CR0.WP and CR4.CET Chao Gao
2025-09-09  9:39 ` [PATCH v14 20/22] KVM: nVMX: Add consistency checks for CET states Chao Gao
2025-09-09  9:39 ` [PATCH v14 21/22] KVM: nVMX: Advertise new VM-Entry/Exit control bits for CET state Chao Gao
2025-09-09  9:39 ` [PATCH v14 22/22] KVM: selftest: Add tests for KVM_{GET,SET}_ONE_REG Chao Gao
2025-09-10 18:06   ` Sean Christopherson
2025-09-09  9:52 ` [PATCH v14 00/22] Enable CET Virtualization Chao Gao
2025-09-10 18:29   ` Sean Christopherson

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