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Subject[Resend PATCH V5 6/10] KVM: Replace old tlb flush function with new one to flush a specified range.
Date
From: Lan Tianyu <Tianyu.Lan@microsoft.com>

This patch is to replace kvm_flush_remote_tlbs() with kvm_flush_
remote_tlbs_with_address() in some functions without logic change.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
arch/x86/kvm/mmu.c | 31 +++++++++++++++++++++----------
arch/x86/kvm/paging_tmpl.h | 3 ++-
2 files changed, 23 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 74df957f2f81..1cd3c316a7e6 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1485,8 +1485,12 @@ static bool __drop_large_spte(struct kvm *kvm, u64 *sptep)

static void drop_large_spte(struct kvm_vcpu *vcpu, u64 *sptep)
{
- if (__drop_large_spte(vcpu->kvm, sptep))
- kvm_flush_remote_tlbs(vcpu->kvm);
+ if (__drop_large_spte(vcpu->kvm, sptep)) {
+ struct kvm_mmu_page *sp = page_header(__pa(sptep));
+
+ kvm_flush_remote_tlbs_with_address(vcpu->kvm, sp->gfn,
+ KVM_PAGES_PER_HPAGE(sp->role.level));
+ }
}

/*
@@ -1954,7 +1958,8 @@ static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
rmap_head = gfn_to_rmap(vcpu->kvm, gfn, sp);

kvm_unmap_rmapp(vcpu->kvm, rmap_head, NULL, gfn, sp->role.level, 0);
- kvm_flush_remote_tlbs(vcpu->kvm);
+ kvm_flush_remote_tlbs_with_address(vcpu->kvm, sp->gfn,
+ KVM_PAGES_PER_HPAGE(sp->role.level));
}

int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end)
@@ -2470,7 +2475,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
account_shadowed(vcpu->kvm, sp);
if (level == PT_PAGE_TABLE_LEVEL &&
rmap_write_protect(vcpu, gfn))
- kvm_flush_remote_tlbs(vcpu->kvm);
+ kvm_flush_remote_tlbs_with_address(vcpu->kvm, gfn, 1);

if (level > PT_PAGE_TABLE_LEVEL && need_sync)
flush |= kvm_sync_pages(vcpu, gfn, &invalid_list);
@@ -2590,7 +2595,7 @@ static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep,
return;

drop_parent_pte(child, sptep);
- kvm_flush_remote_tlbs(vcpu->kvm);
+ kvm_flush_remote_tlbs_with_address(vcpu->kvm, child->gfn, 1);
}
}

@@ -3014,8 +3019,10 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, unsigned pte_access,
ret = RET_PF_EMULATE;
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
}
+
if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH || flush)
- kvm_flush_remote_tlbs(vcpu->kvm);
+ kvm_flush_remote_tlbs_with_address(vcpu->kvm, gfn,
+ KVM_PAGES_PER_HPAGE(level));

if (unlikely(is_mmio_spte(*sptep)))
ret = RET_PF_EMULATE;
@@ -5672,7 +5679,8 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm,
* on PT_WRITABLE_MASK anymore.
*/
if (flush)
- kvm_flush_remote_tlbs(kvm);
+ kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+ memslot->npages);
}

static bool kvm_mmu_zap_collapsible_spte(struct kvm *kvm,
@@ -5742,7 +5750,8 @@ void kvm_mmu_slot_leaf_clear_dirty(struct kvm *kvm,
* dirty_bitmap.
*/
if (flush)
- kvm_flush_remote_tlbs(kvm);
+ kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+ memslot->npages);
}
EXPORT_SYMBOL_GPL(kvm_mmu_slot_leaf_clear_dirty);

@@ -5760,7 +5769,8 @@ void kvm_mmu_slot_largepage_remove_write_access(struct kvm *kvm,
lockdep_assert_held(&kvm->slots_lock);

if (flush)
- kvm_flush_remote_tlbs(kvm);
+ kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+ memslot->npages);
}
EXPORT_SYMBOL_GPL(kvm_mmu_slot_largepage_remove_write_access);

@@ -5777,7 +5787,8 @@ void kvm_mmu_slot_set_dirty(struct kvm *kvm,

/* see kvm_mmu_slot_leaf_clear_dirty */
if (flush)
- kvm_flush_remote_tlbs(kvm);
+ kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+ memslot->npages);
}
EXPORT_SYMBOL_GPL(kvm_mmu_slot_set_dirty);

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 7cf2185b7eb5..6bdca39829bc 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -894,7 +894,8 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa)
pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t);

if (mmu_page_zap_pte(vcpu->kvm, sp, sptep))
- kvm_flush_remote_tlbs(vcpu->kvm);
+ kvm_flush_remote_tlbs_with_address(vcpu->kvm,
+ sp->gfn, KVM_PAGES_PER_HPAGE(sp->role.level));

if (!rmap_can_add(vcpu))
break;
--
2.14.4
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