SEV: Guest bug fixes

JIRA: https://issues.redhat.com/browse/RHEL-39439

Depends: !4224 (merged)

v3: Added a stackleak plugin fix for bug introduced due to 0f7f7b63

v2:

Patch 1/5 fixes a crash with cpu hotplug. 2/5 and 3/5 and 4/5 do not introduce any functional changes - 3/5 and 4/5 are for SME and SEV respectively but are tied up since they use common machinery for running kernels with C-bit-encrypted. They help apply the following patch cleanly. 5/5 fixes a bug with SEV guests' behavior with accessing ROM regions. Although, it's unlikely we will hit it on top of KVM/QEMU, it is a bug fix and prevents a crash on top of non-efi hypervisors.

v1:

Patch 1/4 fixes a crash with cpu hotplug. 2/4 and 3/4 do not introduce any functional changes but 3/4 helps applying 4/4 cleanly. 4/4 fixes a bug with SEV guests' behavior with accessing ROM regions. Although, it's unlikely we will hit it on top of KVM/QEMU, it is a bug fix and prevents a crash on top of non-efi hypervisors.

Signed-off-by: Bandan Das bsd@redhat.com