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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>
This commit is contained in:
Tom Lendacky 2024-03-08 07:32:37 -08:00 committed by mergify[bot]
parent 18fdffe825
commit 28fecae8a3
1 changed files with 53 additions and 1 deletions
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54
OvmfPkg/Library/AmdSvsmLib/AmdSvsmLib.c
View File

@ -377,6 +377,57 @@ AmdSvsmSnpPvalidate (
AmdSvsmIsSvsmPresent () ? SvsmPvalidate (Info) : BasePvalidate (Info);
}
/**
Perform an RMPADJUST operation to alter the VMSA setting of a page.
Add or remove the VMSA attribute for a page.
@param[in] Vmsa Pointer to an SEV-ES save area page
@param[in] ApicId APIC ID associated with the VMSA
@param[in] SetVmsa Boolean indicator as to whether to set or
or clear the VMSA setting for the page
@retval EFI_SUCCESS RMPADJUST operation successful
@retval EFI_UNSUPPORTED Operation is not supported
@retval EFI_INVALID_PARAMETER RMPADJUST operation failed, an invalid
parameter was supplied
**/
STATIC
EFI_STATUS
SvsmVmsaRmpAdjust (
IN SEV_ES_SAVE_AREA *Vmsa,
IN UINT32 ApicId,
IN BOOLEAN SetVmsa
)
{
SVSM_CALL_DATA SvsmCallData;
SVSM_FUNCTION Function;
UINTN Ret;
SvsmCallData.Caa = (SVSM_CAA *)AmdSvsmSnpGetCaa ();
Function.Id.Protocol = 0;
if (SetVmsa) {
Function.Id.CallId = 2;
SvsmCallData.RaxIn = Function.Uint64;
SvsmCallData.RcxIn = (UINT64)(UINTN)Vmsa;
SvsmCallData.RdxIn = (UINT64)(UINTN)Vmsa + SIZE_4KB;
SvsmCallData.R8In = ApicId;
} else {
Function.Id.CallId = 3;
SvsmCallData.RaxIn = Function.Uint64;
SvsmCallData.RcxIn = (UINT64)(UINTN)Vmsa;
}
Ret = SvsmMsrProtocol (&SvsmCallData);
return (Ret == 0) ? EFI_SUCCESS : EFI_INVALID_PARAMETER;
}
/**
Perform a native RMPADJUST operation to alter the VMSA setting of a page.
@ -444,5 +495,6 @@ AmdSvsmSnpVmsaRmpAdjust (
IN BOOLEAN SetVmsa
)
{
return BaseVmsaRmpAdjust (Vmsa, SetVmsa);
return AmdSvsmIsSvsmPresent () ? SvsmVmsaRmpAdjust (Vmsa, ApicId, SetVmsa)
: BaseVmsaRmpAdjust (Vmsa, SetVmsa);
}