On Mon, Nov 08, 2021 at 01:48:36PM +0000, Dov Murik wrote:
> Commit cff03145ed3c ("sev/i386: Introduce sev_add_kernel_loader_hashes
> for measured linux boot", 2021-09-30) introduced measured direct boot
> with -kernel, using an OVMF-designated hashes table which QEMU fills.
>
> However, if OVMF doesn't designate such an area, QEMU would completely
> abort the VM launch. This breaks launching with -kernel using older
> OVMF images which don't publish the SEV_HASH_TABLE_RV_GUID.
>
> Fix that so QEMU will only look for the hashes table if the sev-guest
> kernel-hashes option is set to on. Otherwise, QEMU won't look for the
> designated area in OVMF and won't fill that area.
>
> To enable addition of kernel hashes, launch the guest with:
>
> -object sev-guest,...,kernel-hashes=on
>
> Signed-off-by: Dov Murik <dovmu...@linux.ibm.com>
> Reported-by: Tom Lendacky <thomas.lenda...@amd.com>
> ---
> target/i386/sev.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
Reviewed-by: Daniel P. Berrangé <berra...@redhat.com>
Regards,
Daniel
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