The struct used for GHCB-based page-state change requests uses a 40-bit
bit-field for the GFN, which is shifted by PAGE_SHIFT to generate a
64-bit address. However, anything beyond 40-bits simply gets shifted off
when doing this, which will cause issues when dealing with 1TB+
addresses. Fix this by casting the 40-bit GFN values to 64-bit ones
prior to shifting it by PAGE_SHIFT.
Fixes: ade62c18f474 ("OvmfPkg/MemEncryptSevLib: add support to validate system
RAM")
Signed-off-by: Michael Roth <[email protected]>
---
v2:
- use EFI_PHYSICAL_ADDRESS instead of UINT64 (Gerd)
.../BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git
a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c
b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c
index 85eb41585b..46c6682760 100644
--- a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c
@@ -78,13 +78,14 @@ PvalidateRange (
IN BOOLEAN Validate
)
{
- UINTN Address, RmpPageSize, Ret, i;
+ UINTN RmpPageSize, Ret, i;
+ EFI_PHYSICAL_ADDRESS Address;
for ( ; StartIndex <= EndIndex; StartIndex++) {
//
// Get the address and the page size from the Info.
//
- Address = Info->Entry[StartIndex].GuestFrameNumber << EFI_PAGE_SHIFT;
+ Address =
((EFI_PHYSICAL_ADDRESS)Info->Entry[StartIndex].GuestFrameNumber) <<
EFI_PAGE_SHIFT;
RmpPageSize = Info->Entry[StartIndex].PageSize;
Ret = AsmPvalidate (RmpPageSize, Validate, Address);
--
2.25.1
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