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

On Jul 22, 2020, at 1:05 AM, Joerg Roedel [off-list ref] wrote:

Hmm, I have a theory ...

On Tue, Jul 21, 2020 at 09:01:44PM +0000, Mike Stunes wrote:

quoted

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;