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[24/24] KVM: x86/mmu: Dump reserved bits if they're detected on non-MMIO SPTE

Message ID 20210225204749.1512652-25-seanjc@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86/mmu: Introduce MMU_PRESENT and fix bugs | expand

Commit Message

Sean Christopherson Feb. 25, 2021, 8:47 p.m. UTC
Debugging unexpected reserved bit page faults sucks.  Dump the reserved
bits that (likely) caused the page fault to make debugging suck a little

Signed-off-by: Sean Christopherson <seanjc@google.com>
 arch/x86/kvm/mmu/mmu.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
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diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index e636fcd529d2..dab0e950a54e 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3555,11 +3555,12 @@  static bool get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr, u64 *sptep)
 			    __is_rsvd_bits_set(rsvd_check, sptes[level], level);
 	if (reserved) {
-		pr_err("%s: detect reserved bits on spte, addr 0x%llx, dump hierarchy:\n",
+		pr_err("%s: reserved bits set on MMU-present spte, addr 0x%llx, hierarchy:\n",
 		       __func__, addr);
 		for (level = root; level >= leaf; level--)
-			pr_err("------ spte 0x%llx level %d.\n",
-			       sptes[level], level);
+			pr_err("------ spte = 0x%llx level = %d, rsvd bits = 0x%llx",
+			       sptes[level], level,
+			       rsvd_check->rsvd_bits_mask[(sptes[level] >> 7) & 1][level-1]);
 	return reserved;