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KVM: x86/mmu: Return a u64 (the old SPTE) from mmu_spte_clear_track_bits()

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Return a u64, not an int, from mmu_spte_clear_track_bits().  The return
value is the old SPTE value, which is very much a 64-bit value.  The sole
caller that consumes the return value, drop_spte(), already uses a u64.
The only reason that truncating the SPTE value is not problematic is
because drop_spte() only queries the shadow-present bit, which is in the
lower 32 bits.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220715224226.3749507-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-07-15 22:42:20 +00:00 committed by Paolo Bonzini
parent da0b93d65e
commit 35d539c3e4
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/mmu/mmu.c
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@ -529,7 +529,7 @@ static bool mmu_spte_update(u64 *sptep, u64 new_spte)
* state bits, it is used to clear the last level sptep.
* Returns the old PTE.
*/
static int mmu_spte_clear_track_bits(struct kvm *kvm, u64 *sptep)
static u64 mmu_spte_clear_track_bits(struct kvm *kvm, u64 *sptep)
{
kvm_pfn_t pfn;
u64 old_spte = *sptep;