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

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Debugging unexpected reserved bit page faults sucks.  Dump the reserved
bits that (likely) caused the page fault to make debugging suck a little
less.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210225204749.1512652-25-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2021-02-25 12:47:49 -08:00
committed by Paolo Bonzini
parent 715f1079ee
commit bb4cdf3af9
1 changed files with 4 additions and 3 deletions
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7
arch/x86/kvm/mmu/mmu.c
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@@ -3582,11 +3582,12 @@ 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;