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Diffstat (limited to 'arch/x86/kernel/probe_roms.c')
-rw-r--r--arch/x86/kernel/probe_roms.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/x86/kernel/probe_roms.c b/arch/x86/kernel/probe_roms.c
index 36e84d904260..319fef37d9dc 100644
--- a/arch/x86/kernel/probe_roms.c
+++ b/arch/x86/kernel/probe_roms.c
@@ -21,6 +21,7 @@
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/setup_arch.h>
+#include <asm/sev.h>
static struct resource system_rom_resource = {
.name = "System ROM",
@@ -197,11 +198,21 @@ static int __init romchecksum(const unsigned char *rom, unsigned long length)
void __init probe_roms(void)
{
- const unsigned char *rom;
unsigned long start, length, upper;
+ const unsigned char *rom;
unsigned char c;
int i;
+ /*
+ * The ROM memory range is not part of the e820 table and is therefore not
+ * pre-validated by BIOS. The kernel page table maps the ROM region as encrypted
+ * memory, and SNP requires encrypted memory to be validated before access.
+ * Do that here.
+ */
+ snp_prep_memory(video_rom_resource.start,
+ ((system_rom_resource.end + 1) - video_rom_resource.start),
+ SNP_PAGE_STATE_PRIVATE);
+
/* video rom */
upper = adapter_rom_resources[0].start;
for (start = video_rom_resource.start; start < upper; start += 2048) {