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KVM: MMU: make spte_is_locklessly_modifiable() more clear

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spte_is_locklessly_modifiable() checks that both SPTE_HOST_WRITEABLE and
SPTE_MMU_WRITEABLE are present on spte. Make it more explicit.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2013-01-30 16:45:00 +02:00 committed by Marcelo Tosatti
parent 75d61fbcf5
commit feb3eb704a
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/mmu.c
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@ -448,7 +448,8 @@ static bool __check_direct_spte_mmio_pf(u64 spte)
static bool spte_is_locklessly_modifiable(u64 spte)
{
return !(~spte & (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE));
return (spte & (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE)) ==
(SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE);
}
static bool spte_has_volatile_bits(u64 spte)