Commit 40ef75a7 authored by Lan Tianyu's avatar Lan Tianyu Committed by Paolo Bonzini
Browse files

KVM/MMU: Add tlb flush with range helper function 



This patch is to add wrapper functions for tlb_remote_flush_with_range
callback and flush tlb directly in kvm_mmu_zap_collapsible_spte().
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: default avatarLan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 1f3a3e46

arch/x86/kvm/mmu.c

+36 −1
Original line number Diff line number Diff line
@@ -264,6 +264,35 @@ static void mmu_spte_set(u64 *sptep, u64 spte); 
static union kvm_mmu_page_role

kvm_mmu_calc_root_page_role(struct kvm_vcpu *vcpu);





static inline bool kvm_available_flush_tlb_with_range(void)

{

	return kvm_x86_ops->tlb_remote_flush_with_range;

}



static void kvm_flush_remote_tlbs_with_range(struct kvm *kvm,

		struct kvm_tlb_range *range)

{

	int ret = -ENOTSUPP;



	if (range && kvm_x86_ops->tlb_remote_flush_with_range)

		ret = kvm_x86_ops->tlb_remote_flush_with_range(kvm, range);



	if (ret)

		kvm_flush_remote_tlbs(kvm);

}



static void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,

		u64 start_gfn, u64 pages)

{

	struct kvm_tlb_range range;



	range.start_gfn = start_gfn;

	range.pages = pages;



	kvm_flush_remote_tlbs_with_range(kvm, &range);

}



void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask, u64 mmio_value)

{

	BUG_ON((mmio_mask & mmio_value) != mmio_value);
@@ -5671,7 +5700,13 @@ restart: 
			!kvm_is_reserved_pfn(pfn) &&

			PageTransCompoundMap(pfn_to_page(pfn))) {

			pte_list_remove(rmap_head, sptep);



			if (kvm_available_flush_tlb_with_range())

				kvm_flush_remote_tlbs_with_address(kvm, sp->gfn,

					KVM_PAGES_PER_HPAGE(sp->role.level));

			else

				need_tlb_flush = 1;



			goto restart;

		}

	}

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