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OvmfPkg/MemEncryptSevLib: skip page state change for Mmio address 

The SetMemoryEncDec() is used by the higher level routines to set or clear
the page encryption mask for system RAM and Mmio address. When SEV-SNP is
active, in addition to set/clear page mask it also updates the RMP table.
The RMP table updates are required for the system RAM address and not
the Mmio address.

Add a new parameter in SetMemoryEncDec() to tell whether the specified
address is Mmio. If its Mmio then skip the page state change in the RMP
table.

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: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
This commit is contained in:
Brijesh Singh 2021-12-09 11:27:57 +08:00 committed by mergify[bot]
parent b928eb44d5
commit b7b8872031
1 changed files with 13 additions and 7 deletions
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20
OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c
View File

@ -671,6 +671,7 @@ Done:
@param[in] Mode Set or Clear mode @param[in] Mode Set or Clear mode
@param[in] CacheFlush Flush the caches before applying the @param[in] CacheFlush Flush the caches before applying the
encryption mask encryption mask
@param[in] Mmio The physical address specified is Mmio
@retval RETURN_SUCCESS The attributes were cleared for the @retval RETURN_SUCCESS The attributes were cleared for the
memory region. memory region.
@ -686,7 +687,8 @@ SetMemoryEncDec (
IN PHYSICAL_ADDRESS PhysicalAddress, IN PHYSICAL_ADDRESS PhysicalAddress,
IN UINTN Length, IN UINTN Length,
IN MAP_RANGE_MODE Mode, IN MAP_RANGE_MODE Mode,
IN BOOLEAN CacheFlush IN BOOLEAN CacheFlush,
IN BOOLEAN Mmio
) )
{ {
PAGE_MAP_AND_DIRECTORY_POINTER *PageMapLevel4Entry; PAGE_MAP_AND_DIRECTORY_POINTER *PageMapLevel4Entry;
@ -709,14 +711,15 @@ SetMemoryEncDec (
DEBUG (( DEBUG ((
DEBUG_VERBOSE, DEBUG_VERBOSE,
"%a:%a: Cr3Base=0x%Lx Physical=0x%Lx Length=0x%Lx Mode=%a CacheFlush=%u\n", "%a:%a: Cr3Base=0x%Lx Physical=0x%Lx Length=0x%Lx Mode=%a CacheFlush=%u Mmio=%u\n",
gEfiCallerBaseName, gEfiCallerBaseName,
__FUNCTION__, __FUNCTION__,
Cr3BaseAddress, Cr3BaseAddress,
PhysicalAddress, PhysicalAddress,
(UINT64)Length, (UINT64)Length,
(Mode == SetCBit) ? "Encrypt" : "Decrypt", (Mode == SetCBit) ? "Encrypt" : "Decrypt",
(UINT32)CacheFlush (UINT32)CacheFlush,
(UINT32)Mmio
)); ));
// //
@ -758,7 +761,7 @@ SetMemoryEncDec (
// //
// The InternalSetPageState() is used for setting the page state in the RMP table. // The InternalSetPageState() is used for setting the page state in the RMP table.
// //
if ((Mode == ClearCBit) && MemEncryptSevSnpIsEnabled ()) { if (!Mmio && (Mode == ClearCBit) && MemEncryptSevSnpIsEnabled ()) {
InternalSetPageState (PhysicalAddress, EFI_SIZE_TO_PAGES (Length), SevSnpPageShared, FALSE); InternalSetPageState (PhysicalAddress, EFI_SIZE_TO_PAGES (Length), SevSnpPageShared, FALSE);
} }
@ -996,7 +999,8 @@ InternalMemEncryptSevSetMemoryDecrypted (
PhysicalAddress, PhysicalAddress,
Length, Length,
ClearCBit, ClearCBit,
TRUE TRUE,
FALSE
); );
} }
@ -1029,7 +1033,8 @@ InternalMemEncryptSevSetMemoryEncrypted (
PhysicalAddress, PhysicalAddress,
Length, Length,
SetCBit, SetCBit,
TRUE TRUE,
FALSE
); );
} }
@ -1062,6 +1067,7 @@ InternalMemEncryptSevClearMmioPageEncMask (
PhysicalAddress, PhysicalAddress,
Length, Length,
ClearCBit, ClearCBit,
FALSE FALSE,
TRUE
); );
} }