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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2020-09-07 15:16:12 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-09-10 21:48:50 +0200 |
| commit | 39336f4ffb2478ad384075cf4ba7ef2e5db2bbd7 (patch) | |
| tree | a3b7660370d24d993046a07b47364e1a73fa8b1f /arch/x86/boot | |
| parent | 4ca68e023b11e4d5908bf9ee326fab01111d77d5 (diff) | |
| download | linux-39336f4ffb2478ad384075cf4ba7ef2e5db2bbd7.tar.bz2 | |
x86/efi: Add GHCB mappings when SEV-ES is active
Calling down to EFI runtime services can result in the firmware
performing VMGEXIT calls. The firmware is likely to use the GHCB of the
OS (e.g., for setting EFI variables), so each GHCB in the system needs
to be identity-mapped in the EFI page tables, as unencrypted, to avoid
page faults.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
[ jroedel@suse.de: Moved GHCB mapping loop to sev-es.c ]
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lkml.kernel.org/r/20200907131613.12703-72-joro@8bytes.org
Diffstat (limited to 'arch/x86/boot')
| -rw-r--r-- | arch/x86/boot/compressed/sev-es.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/sev-es.c b/arch/x86/boot/compressed/sev-es.c index 5f15e5864e0c..2a6c7c375244 100644 --- a/arch/x86/boot/compressed/sev-es.c +++ b/arch/x86/boot/compressed/sev-es.c @@ -12,6 +12,7 @@ */ #include "misc.h" +#include <asm/pgtable_types.h> #include <asm/sev-es.h> #include <asm/trapnr.h> #include <asm/trap_pf.h> |