KVM: x86/mmu: Remove unnecessary ‘NULL’ values from sptep

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Don't initialize "spte" and "sptep" in fast_page_fault() as they are both
guaranteed (for all intents and purposes) to be written at the start of
every loop iteration.  Add a sanity check that "sptep" is non-NULL after
walking the shadow page tables, as encountering a NULL root would result
in "spte" not being written, i.e. would lead to uninitialized data or the
previous value being consumed.

Signed-off-by: Li zeming <zeming@nfschina.com>
Link: https://lore.kernel.org/r/20230905182006.2964-1-zeming@nfschina.com
[sean: rewrite changelog with --verbose]
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Li zeming 2023-09-06 02:20:06 +08:00 • committed by Sean Christopherson

parent c9f65a3f2d

commit 1de9992f9d

1 changed files with 10 additions and 2 deletions

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arch/x86/kvm/mmu/mmu.c

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