Messages in this thread Patch in this message | | | From | Brijesh Singh <> | Subject | [PATCH] x86/efi: Access EFI MMIO data as unencrypted when SEV is active | Date | Tue, 3 Jul 2018 08:32:00 -0500 |
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SEV guest fails to update the UEFI runtime variables stored in the flash. commit 1379edd59673 ("x86/efi: Access EFI data as encrypted when SEV is active") unconditionally maps all the UEFI runtime data as 'encrypted' (C=1). When SEV is active the UEFI runtime data marked as EFI_MEMORY_MAPPED_IO should be mapped as 'unencrypted' so that both guest and hypervisor can access the data.
Fixes: 1379edd59673 (x86/efi: Access EFI data as encrypted ...) Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@suse.de> Cc: linux-efi@vger.kernel.org Cc: kvm@vger.kernel.org Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: <stable@vger.kernel.org> # 4.15.x Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> --- arch/x86/platform/efi/efi_64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c index 77873ce..5f2eb32 100644 --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -417,7 +417,7 @@ static void __init __map_region(efi_memory_desc_t *md, u64 va) if (!(md->attribute & EFI_MEMORY_WB)) flags |= _PAGE_PCD; - if (sev_active()) + if (sev_active() && md->type != EFI_MEMORY_MAPPED_IO) flags |= _PAGE_ENC; pfn = md->phys_addr >> PAGE_SHIFT; -- 2.7.4
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