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author | Sean Christopherson <seanjc@google.com> | 2023-07-21 15:37:11 -0700 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-08-31 13:48:39 -0400 |
commit | d09f711233a43869725abc44102117d2a8fae6fe (patch) | |
tree | 56a766abccd850b0769f4beba691170cdf4fd47a /tools/perf/scripts/python/call-graph-from-postgresql.py | |
parent | 91303f800e76517d1e96d47dec290c5d5dbf1230 (diff) |
KVM: x86/mmu: Guard against collision with KVM-defined PFERR_IMPLICIT_ACCESS
Add an assertion in kvm_mmu_page_fault() to ensure the error code provided
by hardware doesn't conflict with KVM's software-defined IMPLICIT_ACCESS
flag. In the unlikely scenario that future hardware starts using bit 48
for a hardware-defined flag, preserving the bit could result in KVM
incorrectly interpreting the unknown flag as KVM's IMPLICIT_ACCESS flag.
WARN so that any such conflict can be surfaced to KVM developers and
resolved, but otherwise ignore the bit as KVM can't possibly rely on a
flag it knows nothing about.
Fixes: 4f4aa80e3b88 ("KVM: X86: Handle implicit supervisor access with SMAP")
Acked-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lore.kernel.org/r/20230721223711.2334426-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions