[edk2-devel] [PATCH v3 09/35] OvmfPkg/OvmfXen: use a TimerLib instance that depends only on the CPU

[Roger Pau Monné]

On Thu, Jul 04, 2019 at 03:42:07PM +0100, Anthony PERARD wrote:
> ACPI Timer does not work in a PVH guest, but local APIC works on both

This is not accurate. It's not that the ACPI timer doesn't work, it's
just that it's not present. The PM_TMR_BLK should be set to 0 to
indicate the lack of PM timer support, or else there's something
broken.

> PVH and HVM.
> 
> Note that the use of SecPeiDxeTimerLibCpu might be an issue with a
> driver of type DXE_RUNTIME_DRIVER. I've attemptde to find out which of
                                          ^ attempted
> the DXE_RUNTIME_DRIVER uses the TimerLib at runtime. I've done that by
> replacing the TimerLib evaluation in
> [LibraryClasses.common.DXE_RUNTIME_DRIVER] by a different one and
> check every module that uses it (with the --report-file=report build
  ^ checking
> option).
> 
> ResetSystemRuntimeDxe is calling the TimerLib API at runtime to do the
> operation "EfiResetCold", so this may never complete if the OS have
> disabled the Local APIC Timer.

Thanks, Roger.

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