In case efi_mm is active go use the userspace instruction decoder which
supports fetching instructions from active_mm. This is needed to make
instruction emulation work for EFI runtime code, so it can use cpuid
and rdmsr.
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
arch/x86/coco/sev/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
index 36beaac713c1..145f594d7e6b 100644
--- a/arch/x86/coco/sev/core.c
+++ b/arch/x86/coco/sev/core.c
@@ -346,7 +346,7 @@ static enum es_result __vc_decode_kern_insn(struct es_em_ctxt *ctxt)
static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt)
{
- if (user_mode(ctxt->regs))
+ if (user_mode(ctxt->regs) || current->active_mm == &efi_mm)
return __vc_decode_user_insn(ctxt);
else
return __vc_decode_kern_insn(ctxt);
--
2.49.0
