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Re: [Xen-devel] [edk2-devel] [PATCH v4 29/35] OvmfPkg/OvmfXen: Override PcdFSBClock to Xen vLAPIC timer frequency

On Thu, Aug 08, 2019 at 05:18:15PM +0200, Roger Pau Monné wrote:
> On Thu, Aug 08, 2019 at 03:26:41PM +0100, Anthony PERARD wrote:
> > So EDKII doesn't have that capability, FSBClock is a build time value
> > and can't be changed at run time. But OVMF (on KVM or HVM) doesn't use
> > that value at all, it uses the ACPI timer instead.
> But after your series both PVH and HVM will use the lapic timer
> instead of the ACPI timer, and thus rely on the value of FSBClock?

Short answer, Yes.

Longuer answer, after the series is applied, there will be a new
platform, "OvmfXen" which will be for both Xen PVH and Xen HVM, but the
OVMF that we know (OvmfPkgX64 that xen.git builds) will still be
capable of running on Xen HVM for a short while and will still use the
ACPI timer.

Anthony PERARD

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