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 <sea...@google.com> --- arch/x86/kvm/mmu/mmu.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) 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; -- 2.30.1.766.gb4fecdf3b7-goog