Re: [PATCH v4 29/31] hw/i386/sev: Allow use of pflash in conjunction with -bios

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On Mon, Jun 3, 2024 at 1:55 PM Daniel P. Berrangé <berrange@xxxxxxxxxx> wrote:
> I really wish we didn't have to introduce this though - is there really
> no way to make it possible to use pflash for both CODE & VARS with SNP,
> as is done with traditional VMs, so we don't diverge in setup, needing
> yet more changes up the mgmt stack ?

No, you cannot use pflash for CODE in either SNP or TDX. The hardware
does not support it.

One possibility is to only support non-pflash-based variable store.
This is not yet in QEMU, but it is how both AWS and Google implemented
UEFI variables and I think Gerd was going to work on it for QEMU.


Paolo






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