[PATCH v4 51/75] x86/sev-es: Handle MMIO events

Joerg Roedel
Wed, 22 Jul 2020 08:05:30 -0000

Hmm, I have a theory ...

On Tue, Jul 21, 2020 at 09:01:44PM +0000, Mike Stunes
wrote:
> If I remove the call to probe_roms from setup_arch, or remove the calls to
romchecksum from probe_roms, this kernel boots normally.
>
> Please let me know of other tests I should run or data that I can collect.
Thanks!

... can you please try the attached diff?

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 251d0aabc55a..e1fea7a38019 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -389,7 +389,8 @@ static bool vc_slow_virt_to_phys(struct ghcb *ghcb, struct
es_em_ctxt *ctxt,
 	pgd_t *pgd;
 	pte_t *pte;

-	pgd = pgd_offset(current->active_mm, va);
+	pgd = __va(read_cr3_pa());
+	pgd = &pgd[pgd_index(va)];
 	pte = lookup_address_in_pgd(pgd, va, &level);
 	if (!pte) {
 		ctxt->fi.vector     = X86_TRAP_PF;