Re: [PATCH v6 13/51] x86/acrn: Mark TSC frequency as known when using ACRN for calibration
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From: Sean Christopherson <seanjc@google.com>
Date: 2026-08-10 13:56:32
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kvm, linux-coco, lkml, virtualization, xen-devel
On Sat, Aug 08, 2026, David Woodhouse wrote:
On Thu, 2026-08-06 at 16:35 -0700, Sean Christopherson wrote:quoted
Mark the TSC frequency as known when using ACRN's PV CPUID information. Per commit 81a71f51b89e ("x86/acrn: Set up timekeeping") and common sense, the TSC freq is explicitly provided by the hypervisor. Signed-off-by: Sean Christopherson <seanjc@google.com>Huh... does this literally get reverted completely in the very *next* patch in the series? Kind of weird, but I guess in some ways it makes sense...
The literal code gets reverted, but the functional change does not. Before this change, ACRN is the only guest-side PV code that doesn't set X86_FEATURE_TSC_KNOWN_FREQ when the hypervisor provides the exact frequency. I.e. this patch allows for making the "No functional change intended" claim in the next patch.