[edk2-devel] EDK2 UpdateVariable very slow for the first defined VM on aarch64 with preempt-rt kernel

["wanglimin" <wanglimin@xfusion.com>]

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Hi Ard,

I notice that you had ever worked on VirtNorFlashDxe, and maybe can help me on the following trouble.

I am trying to boot kvm VM on aarch64(arm-v8) with preempt-rt kernel host,
the UpdateVariable is very very slow, and the uefi boot take about ~80s to get to phase,
while it takes only about ~15s on a normal linux kernel or on x86 hardware.

This only happen when the VM is first defined, or redefine the VM:
virsh destroy VM;
virsh undefine VM --nvram
virsh define VM.xml ;
virsh start VM
It seems the most time spending when VirtNorFlash write operation at MmioWrite32();
On X64 platform，it seems use EmuVariableFvbRuntimeDxe driver，not really write the NorFlash device，
Is it possible for arm to use the similar way as X64 ?

Could you give any suggestion?

Best Regards.
Limin Wang




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