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Re: [RFC PATCH v1 10/15] KVM: VMX: Use WRMSRNS or its immediate form when available
- To: "H. Peter Anvin" <hpa@xxxxxxxxx>, Jim Mattson <jmattson@xxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>
- From: Xin Li <xin@xxxxxxxxx>
- Date: Mon, 14 Apr 2025 10:48:47 -0700
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- Delivery-date: Mon, 14 Apr 2025 17:49:31 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 4/12/2025 4:10 PM, H. Peter Anvin wrote:
Also,*in this specific case* IA32_SPEC_CTRL is architecturally nonserializing,
i.e. WRMSR executes as WRMSRNS anyway.
While the immediate form WRMSRNS could be faster because the MSR index
is available *much* earlier in the pipeline, right?
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