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MdePkg/BaseLib: add support for RMPADJUST instruction

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275

The RMPADJUST instruction will be used by the SEV-SNP guest to modify the
RMP permissions for a guest page. See AMD APM volume 3 for further
details.

Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Message-Id: <20210519181949.6574-9-brijesh.singh@amd.com>
This commit is contained in:
Tom Lendacky
2021-05-19 13:19:44 -05:00
committed by mergify[bot]
parent 5a7cbd54a1
commit 2b5b2ff04d
4 changed files with 84 additions and 0 deletions
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35
MdePkg/Include/Library/BaseLib.h
View File

@@ -4861,6 +4861,41 @@ AsmPvalidate (
IN BOOLEAN Validate,
IN PHYSICAL_ADDRESS Address
);
//
// RDX settings for RMPADJUST
//
#define RMPADJUST_VMPL_MAX 3
#define RMPADJUST_VMPL_MASK 0xFF
#define RMPADJUST_VMPL_SHIFT 0
#define RMPADJUST_PERMISSION_MASK_MASK 0xFF
#define RMPADJUST_PERMISSION_MASK_SHIFT 8
#define RMPADJUST_VMSA_PAGE_BIT BIT16
/**
Adjusts the permissions of an SEV-SNP guest page.
Executes a RMPADJUST instruction with the register state specified by Rax,
Rcx, and Rdx. Returns Eax. This function is only available on X64.
The instruction is available only when CPUID Fn8000_001F_EAX[SNP]=1.
@param[in] Rax The value to load into RAX before executing the RMPADJUST
instruction.
@param[in] Rcx The value to load into RCX before executing the RMPADJUST
instruction.
@param[in] Rdx The value to load into RDX before executing the RMPADJUST
instruction.
@return Eax
**/
UINT32
EFIAPI
AsmRmpAdjust (
IN UINT64 Rax,
IN UINT64 Rcx,
IN UINT64 Rdx
);
#endif