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KVM/MMU: Add tlb flush with range helper function

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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: Lan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lan Tianyu 2018-12-06 21:21:08 +08:00 • committed by Paolo Bonzini
parent 1f3a3e46cc
commit 40ef75a758
1 changed files with 36 additions and 1 deletions
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37
arch/x86/kvm/mmu.c
View file

@ -264,6 +264,35 @@ static void mmu_spte_set(u64 *sptep, u64 spte);
static union kvm_mmu_page_role static union kvm_mmu_page_role
kvm_mmu_calc_root_page_role(struct kvm_vcpu *vcpu); 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) void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask, u64 mmio_value)
{ {
BUG_ON((mmio_mask & mmio_value) != mmio_value); BUG_ON((mmio_mask & mmio_value) != mmio_value);
@ -5671,7 +5700,13 @@ restart:
!kvm_is_reserved_pfn(pfn) && !kvm_is_reserved_pfn(pfn) &&
PageTransCompoundMap(pfn_to_page(pfn))) { PageTransCompoundMap(pfn_to_page(pfn))) {
pte_list_remove(rmap_head, sptep); pte_list_remove(rmap_head, sptep);
need_tlb_flush = 1;
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; goto restart;
} }
} }