Allen

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Is there any efforts to migrate those examples to adatpe the new device management interface?

I had met similar issue : with preempt-rt kernel, UEFI boot very slow for kvm virtual machine #6518 please see: https://github.com/tianocore/edk2/discussions/6518

> Most likely this is simply writing to emulated flash being slow. It's a vmexit (round-trip to the host) for every mmio write operation, so flash block updates are quite...

> qemu got support for managing efi variables in 10.0 (will be released in a week or so). edk2 side of that is [#10695](https://github.com/tianocore/edk2/pull/10695) which hopefully lands in 2025-05 stable...

> Looks sane on a quick glance. Any output on the serial console? the searial log stay at ``` [Bds]BdsWait ...Zzzzzzzzzzzz... [Bds]BdsWait(5)..Zzzz... ``` There are also several Error reported such...

> Hmm, that doesn't look variable store related. Does this only happen with `QEMU_PV_VARS=TRUE`? The PR landed yesterday btw, so you can simply use the master branch now. > >...

@kraxel If missing uefi-vars-x64 deviec for qemu, I test vm will not boot on edk2 built with QEMU_PV_VARS=TRUE. Is it possible to boot vm with the lagacy way without uefi-vars-x64...