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| author | Brijesh Singh <brijesh.singh@amd.com> | 2021-05-19 13:19:45 -0500 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2021-05-29 12:15:21 +0000 |
| commit | 901a9bfc3a24619fb3381e414a178f092f0d07d6 (patch) | |
| tree | d5a409900b5e260cbf1314646119b0a4509950b6 /OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h | |
| parent | 2b5b2ff04df447288ab333d5a2952a2a1a1327eb (diff) | |
| download | edk2-901a9bfc3a24619fb3381e414a178f092f0d07d6.tar.gz edk2-901a9bfc3a24619fb3381e414a178f092f0d07d6.tar.bz2 edk2-901a9bfc3a24619fb3381e414a178f092f0d07d6.zip | |
OvmfPkg/BaseMemEncryptSevLib: introduce MemEncryptSevClearMmioPageEncMask()
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275
The MemEncryptSevClearMmioPageEncMask() helper can be used for clearing
the memory encryption mask for the Mmio region.
The MemEncryptSevClearMmioPageEncMask() is a simplified version of
MemEncryptSevClearPageEncMask() -- it does not flush the caches after
clearing the page encryption mask.
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>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Message-Id: <20210519181949.6574-10-brijesh.singh@amd.com>
Diffstat (limited to 'OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h')
| -rw-r--r-- | OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h index fe2a0b2826..8dc39e647b 100644 --- a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h +++ b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.h @@ -126,4 +126,27 @@ InternalMemEncryptSevGetAddressRangeState ( IN UINTN Length
);
+/**
+ This function clears memory encryption bit for the MMIO region specified by
+ PhysicalAddress and Length.
+
+ @param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
+ current CR3)
+ @param[in] PhysicalAddress The physical address that is the start
+ address of a MMIO region.
+ @param[in] Length The length of memory region
+
+ @retval RETURN_SUCCESS The attributes were cleared for the
+ memory region.
+ @retval RETURN_INVALID_PARAMETER Length is zero.
+ @retval RETURN_UNSUPPORTED Clearing the memory encyrption attribute
+ is not supported
+**/
+RETURN_STATUS
+EFIAPI
+InternalMemEncryptSevClearMmioPageEncMask (
+ IN PHYSICAL_ADDRESS Cr3BaseAddress,
+ IN PHYSICAL_ADDRESS PhysicalAddress,
+ IN UINTN Length
+ );
#endif
|