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OvmfPkg/BaseMemEncryptSevLib: Calculate memory size for Page State Change

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654

Calculate the amount of memory that can be use to build the Page State
Change data (SNP_PAGE_STATE_CHANGE_INFO) instead of using a hard-coded
size. This allows for changes to the GHCB shared buffer size without
having to make changes to the page state change code.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Michael Roth <michael.roth@amd.com>
Cc: Min Xu <min.m.xu@intel.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
This commit is contained in:
Tom Lendacky 2024-03-08 07:30:49 -08:00 committed by mergify[bot]
parent 6b14ef6b28
commit 5fe9db0f82
1 changed files with 8 additions and 4 deletions
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12
OvmfPkg/Library/BaseMemEncryptSevLib/X64/SnpPageStateChangeInternal.c
View File

@ -133,23 +133,26 @@ BuildPageStateBuffer (
IN EFI_PHYSICAL_ADDRESS EndAddress, IN EFI_PHYSICAL_ADDRESS EndAddress,
IN SEV_SNP_PAGE_STATE State, IN SEV_SNP_PAGE_STATE State,
IN BOOLEAN UseLargeEntry, IN BOOLEAN UseLargeEntry,
IN SNP_PAGE_STATE_CHANGE_INFO *Info IN SNP_PAGE_STATE_CHANGE_INFO *Info,
IN UINTN InfoSize
) )
{ {
EFI_PHYSICAL_ADDRESS NextAddress; EFI_PHYSICAL_ADDRESS NextAddress;
UINTN RmpPageSize; UINTN RmpPageSize;
UINTN Index; UINTN Index;
UINTN IndexMax;
// Clear the page state structure // Clear the page state structure
SetMem (Info, sizeof (*Info), 0); SetMem (Info, InfoSize, 0);
Index = 0; Index = 0;
IndexMax = (InfoSize - sizeof (Info->Header)) / sizeof (Info->Entry[0]);
NextAddress = EndAddress; NextAddress = EndAddress;
// //
// Populate the page state entry structure // Populate the page state entry structure
// //
while ((BaseAddress < EndAddress) && (Index < SNP_PAGE_STATE_MAX_ENTRY)) { while ((BaseAddress < EndAddress) && (Index < IndexMax)) {
// //
// Is this a 2MB aligned page? Check if we can use the Large RMP entry. // Is this a 2MB aligned page? Check if we can use the Large RMP entry.
// //
@ -265,7 +268,8 @@ InternalSetPageState (
EndAddress, EndAddress,
State, State,
UseLargeEntry, UseLargeEntry,
Info Info,
sizeof (Ghcb->SharedBuffer)
); );
// //