tree 17f2fe68261729f6121580073c7ad3b7e6b859c9
parent 18fdffe825683df40d7a4a9eba11b8630bcef050
author Tom Lendacky <thomas.lendacky@amd.com> 1709911957 -0800
committer mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> 1713384281 +0000

OvmfPkg/AmdSvsmLib: Add support for the SVSM create/delete vCPU calls

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654

The RMPADJUST instruction is used to alter the VMSA attribute of a page,
but the VMSA attribute can only be changed when running at VMPL0. When
an SVSM is present, use the SVSM_CORE_CREATE_VCPU and SVSM_CORE_DELTE_VCPU
calls to add or remove the VMSA attribute on a page instead of issuing
the RMPADJUST instruction directly.

Implement the AmdSvsmSnpVmsaRmpAdjust() API to perform the proper operation
to update the VMSA attribute.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>