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38 lines
1.6 KiB
38 lines
1.6 KiB
3 weeks ago
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From ee75d5f03a473eb4007f7aaa58a41719adca0429 Mon Sep 17 00:00:00 2001
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From: Tom Lendacky <thomas.lendacky@amd.com>
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Date: Mon, 18 Nov 2024 12:59:32 -0600
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Subject: [PATCH] OvmfPkg/QemuFlashFvbServicesRuntimeDxe: Do not use flash with
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SEV-SNP
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SEV-SNP does not support the use of the Qemu flash device as SEV-SNP
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guests are started using the Qemu -bios option instead of the Qemu -drive
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if=pflash option. Perform runtime detection of SEV-SNP and exit early from
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the Qemu flash device initialization, indicating the Qemu flash device is
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not present. SEV-SNP guests will use the emulated variable support.
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Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
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(cherry picked from commit f0d2bc3ab268c8e3c6da4158208df38bc9d3677e)
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---
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OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c
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index a577aea556..5e393e98ed 100644
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--- a/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c
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+++ b/OvmfPkg/QemuFlashFvbServicesRuntimeDxe/QemuFlash.c
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@@ -259,6 +259,14 @@ QemuFlashInitialize (
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VOID
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)
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{
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+ //
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+ // The SNP model does not provide for QEMU flash device support, so exit
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+ // early before attempting to initialize any QEMU flash device support.
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+ //
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+ if (MemEncryptSevSnpIsEnabled ()) {
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+ return EFI_UNSUPPORTED;
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+ }
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+
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mFlashBase = (UINT8 *)(UINTN)PcdGet32 (PcdOvmfFdBaseAddress);
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mFdBlockSize = PcdGet32 (PcdOvmfFirmwareBlockSize);
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ASSERT (PcdGet32 (PcdOvmfFirmwareFdSize) % mFdBlockSize == 0);
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