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| author | Brijesh Singh via groups.io <brijesh.singh=amd.com@groups.io> | 2021-12-09 11:27:45 +0800 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2021-12-09 06:28:10 +0000 |
| commit | d39f8d88ecb31df46e2f95bcc5c20100d1f14681 (patch) | |
| tree | e4f67f2d7a87dd6d6349093e455eed18b5b65e35 /OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h | |
| parent | 11b15336f0ced4879529708f734a83adf69faf47 (diff) | |
| download | edk2-d39f8d88ecb31df46e2f95bcc5c20100d1f14681.tar.gz edk2-d39f8d88ecb31df46e2f95bcc5c20100d1f14681.tar.bz2 edk2-d39f8d88ecb31df46e2f95bcc5c20100d1f14681.zip | |
OvmfPkg/MemEncryptSevLib: add support to validate > 4GB memory in PEI phase
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275
The initial page built during the SEC phase is used by the
MemEncryptSevSnpValidateSystemRam() for the system RAM validation. The
page validation process requires using the PVALIDATE instruction; the
instruction accepts a virtual address of the memory region that needs
to be validated. If hardware encounters a page table walk failure (due
to page-not-present) then it raises #GP.
The initial page table built in SEC phase address up to 4GB. Add an
internal function to extend the page table to cover > 4GB. The function
builds 1GB entries in the page table for access > 4GB. This will provide
the support to call PVALIDATE instruction for the virtual address >
4GB in PEI phase.
Cc: Michael Roth <michael.roth@amd.com>
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: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Diffstat (limited to 'OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h')
| -rw-r--r-- | OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h index 93e3d08589..ffc7430b22 100644 --- a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h +++ b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h @@ -144,4 +144,28 @@ InternalMemEncryptSevClearMmioPageEncMask ( IN UINTN Length
);
+/**
+ Create 1GB identity mapping for the specified virtual address range.
+
+ The function is preliminary used by the SEV-SNP page state change
+ APIs to build the page table required before issuing the PVALIDATE
+ instruction. The function must be removed after the EDK2 core is
+ enhanced to do the lazy validation.
+
+ @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
+ current CR3)
+ @param[in] VirtualAddress Virtual address
+ @param[in] Length Length of virtual address range
+
+ @retval RETURN_INVALID_PARAMETER Number of pages is zero.
+
+**/
+RETURN_STATUS
+EFIAPI
+InternalMemEncryptSevCreateIdentityMap1G (
+ IN PHYSICAL_ADDRESS Cr3BaseAddress,
+ IN PHYSICAL_ADDRESS PhysicalAddress,
+ IN UINTN Length
+ );
+
#endif
|