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Subject[PATCH 6/13] KVM/MMU: Flush tlb directly in kvm_mmu_zap_collapsible_spte()
Date
kvm_mmu_zap_collapsible_spte() returns flush request to the
slot_handle_leaf() and the latter does flush on demand. When
range flush is available, make kvm_mmu_zap_collapsible_spte()
to flush tlb with range directly to avoid returning range back
to slot_handle_leaf().

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
arch/x86/kvm/mmu.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 9ae5887c8d1c..167ecfbab9bd 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -5678,7 +5678,17 @@ static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
!kvm_is_reserved_pfn(pfn) &&
PageTransCompoundMap(pfn_to_page(pfn))) {
drop_spte(kvm, sptep);
- need_tlb_flush = 1;
+
+ if (kvm_available_flush_tlb_with_range()) {
+ u64 gfn_end = sp->gfn +
+ KVM_PAGES_PER_HPAGE(sp->role.level) - 1;
+
+ kvm_flush_remote_tlbs_with_address(kvm, sp->gfn,
+ gfn_end);
+ } else {
+ need_tlb_flush = 1;
+ }
+
goto restart;
}
}
--
2.14.4
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