[RFC PATCH v3 35/59] KVM: x86/mmu: Return old SPTE from mmu_spte_clear_track_bits()

isaku.yamahata
2021-11-25T00:23:07Z

From: Sean Christopherson <sean.j.christopherson@intel.com>

Return the old SPTE when clearing a SPTE and push the "old SPTE present"
check to the caller. Private shadow page support will use the old SPTE
in rmap_remove() to determine whether or not there is a linked private
shadow page.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/mmu/mmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 510991c2e94e..f1bd7d952bfe 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -616,7 +616,7 @@ 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;
--
2.25.1