From: Xin Li <xin@zytor.com>
To: Chao Gao <chao.gao@intel.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
linux-doc@vger.kernel.org, pbonzini@redhat.com,
seanjc@google.com, corbet@lwn.net, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
x86@kernel.org, hpa@zytor.com, luto@kernel.org,
peterz@infradead.org, andrew.cooper3@citrix.com,
hch@infradead.org
Subject: Re: [PATCH v5 10/23] KVM: VMX: Add support for FRED context save/restore
Date: Thu, 24 Jul 2025 11:01:26 -0700 [thread overview]
Message-ID: <5a001c2b-eb59-487e-bf4a-0447af42829c@zytor.com> (raw)
In-Reply-To: <aIHGFpKfkyDisYaZ@intel.com>
On 7/23/2025 10:35 PM, Chao Gao wrote:
> Return KVM_MSR_RET_UNSUPPORTED instead of 1.
>
> KVM's uAPI allows userspace to read MSRs and write 0 to MSRs even if an MSR
> isn't supported according to guest CPUIDs. Returning KVM_MSR_RET_UNSUPPORTED
> allows kvm_do_msr_access() to suppress the failure when needed to comply with
> the uAPI.
>
> For more details, see kvm_do_msr_access().
You're right; I missed the API improvement.
Thanks!
Xin
next prev parent reply other threads:[~2025-07-24 18:02 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-23 17:53 [PATCH v5 00/23] Enable FRED with KVM VMX Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 01/23] KVM: VMX: Add support for the secondary VM exit controls Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 02/23] KVM: VMX: Initialize VM entry/exit FRED controls in vmcs_config Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 03/23] KVM: VMX: Disable FRED if FRED consistency checks fail Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 04/23] x86/cea: Export an API to get per CPU exception stacks for KVM to use Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 05/23] KVM: VMX: Fix an indentation Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 06/23] KVM: VMX: Initialize VMCS FRED fields Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 07/23] KVM: VMX: Set FRED MSR intercepts Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 08/23] KVM: VMX: Save/restore guest FRED RSP0 Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 09/23] KVM: VMX: Add host MSR read/write helpers to streamline preemption logic Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 10/23] KVM: VMX: Add support for FRED context save/restore Xin Li (Intel)
2025-07-24 5:35 ` Chao Gao
2025-07-24 18:01 ` Xin Li [this message]
2025-08-02 17:15 ` [PATCH v5A " Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 11/23] KVM: x86: Add a helper to detect if FRED is enabled for a vCPU Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 12/23] KVM: VMX: Virtualize FRED event_data Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 13/23] KVM: VMX: Virtualize FRED nested exception tracking Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 14/23] Documentation: kvm: Fix a section number typo Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 15/23] KVM: x86: Save/restore the nested flag of an exception Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 16/23] KVM: x86: Mark CR4.FRED as not reserved Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 17/23] KVM: VMX: Dump FRED context in dump_vmcs() Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 18/23] KVM: x86: Advertise support for FRED Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 19/23] KVM: nVMX: Add support for the secondary VM exit controls Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 20/23] KVM: nVMX: Add FRED VMCS fields to nested VMX context handling Xin Li (Intel)
2025-07-24 6:50 ` Chao Gao
2025-07-31 7:24 ` Xin Li
2025-08-02 17:17 ` [PATCH v5A " Xin Li (Intel)
2025-08-02 17:33 ` Xin Li
2025-08-04 6:03 ` Xin Li
2025-07-23 17:53 ` [PATCH v5 21/23] KVM: nVMX: Add FRED-related VMCS field checks Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 22/23] KVM: nVMX: Allow VMX FRED controls Xin Li (Intel)
2025-07-23 17:53 ` [PATCH v5 23/23] KVM: nVMX: Add prerequisites to SHADOW_FIELD_R[OW] macros Xin Li (Intel)
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