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KVM: x86/mmu: Dump reserved bits if they're detected on non-MMIO SPTE
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>
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1 changed files with 4 additions and 3 deletions
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@ -3582,11 +3582,12 @@ static bool get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr, u64 *sptep)
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__is_rsvd_bits_set(rsvd_check, sptes[level], level);
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if (reserved) {
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pr_err("%s: detect reserved bits on spte, addr 0x%llx, dump hierarchy:\n",
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pr_err("%s: reserved bits set on MMU-present spte, addr 0x%llx, hierarchy:\n",
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__func__, addr);
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for (level = root; level >= leaf; level--)
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pr_err("------ spte 0x%llx level %d.\n",
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sptes[level], level);
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pr_err("------ spte = 0x%llx level = %d, rsvd bits = 0x%llx",
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sptes[level], level,
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rsvd_check->rsvd_bits_mask[(sptes[level] >> 7) & 1][level-1]);
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}
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return reserved;
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