From: Lan Tianyu <Tianyu.Lan@xxxxxxxxxxxxx>
This patch is to flush tlb via flush list function. Put
page into flush list when return value of set_spte()
includes flag SET_SPTE_NEED_REMOTE_TLB_FLUSH. kvm_flush_remote_
tlbs_with_list() checks whether the flush list is empty
or not. It also checks whether range tlb flush is available
and go back to tradiion flush if not.
Signed-off-by: Lan Tianyu <Tianyu.Lan@xxxxxxxxxxxxx>
---
Change since v1:
Use check of list_empty in the kvm_flush_remote_tlbs_with_list()
to determine flush or not instead of checking set_spte_ret.
arch/x86/kvm/paging_tmpl.h | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 6bdca39829bc..d84486e75345 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -970,7 +970,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
int i, nr_present = 0;
bool host_writable;
gpa_t first_pte_gpa;
- int set_spte_ret = 0;
+ HLIST_HEAD(flush_list);
/* direct kvm_mmu_page can not be unsync. */
BUG_ON(sp->role.direct);
@@ -978,6 +978,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
first_pte_gpa = FNAME(get_level1_sp_gpa)(sp);
for (i = 0; i < PT64_ENT_PER_PAGE; i++) {
+ int set_spte_ret = 0;
unsigned pte_access;
pt_element_t gpte;
gpa_t pte_gpa;
@@ -1027,14 +1028,20 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
host_writable = sp->spt[i] & SPTE_HOST_WRITEABLE;
- set_spte_ret |= set_spte(vcpu, &sp->spt[i],
+ set_spte_ret = set_spte(vcpu, &sp->spt[i],
pte_access, PT_PAGE_TABLE_LEVEL,
gfn, spte_to_pfn(sp->spt[i]),
true, false, host_writable);
+
+ if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH) {
+ struct kvm_mmu_page *leaf_sp = page_header(sp->spt[i]
+ & PT64_BASE_ADDR_MASK);
+ hlist_add_head(&leaf_sp->flush_link, &flush_list);
+ }
+
}
- if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH)
- kvm_flush_remote_tlbs(vcpu->kvm);
+ kvm_flush_remote_tlbs_with_list(vcpu->kvm, &flush_list);
return nr_present;
}
--
2.14.4
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