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Subject[PATCH V3 3/10] KVM/MMU: Introduce tlb flush with range list
Date
From: Lan Tianyu <Tianyu.Lan@microsoft.com>

This patch is to introduce tlb flush with range list interface and use
struct kvm_mmu_page as list entry. Use flush list function in the
kvm_mmu_commit_zap_page().

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
arch/x86/kvm/mmu.c | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 8d43b7c0f56f..7a862c56b954 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -291,6 +291,20 @@ static void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,

range.start_gfn = start_gfn;
range.pages = pages;
+ range.flush_list = NULL;
+
+ kvm_flush_remote_tlbs_with_range(kvm, &range);
+}
+
+static void kvm_flush_remote_tlbs_with_list(struct kvm *kvm,
+ struct hlist_head *flush_list)
+{
+ struct kvm_tlb_range range;
+
+ if (hlist_empty(flush_list))
+ return;
+
+ range.flush_list = flush_list;

kvm_flush_remote_tlbs_with_range(kvm, &range);
}
@@ -2719,6 +2733,7 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
struct list_head *invalid_list)
{
struct kvm_mmu_page *sp, *nsp;
+ HLIST_HEAD(flush_list);

if (list_empty(invalid_list))
return;
@@ -2732,7 +2747,14 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
* In addition, kvm_flush_remote_tlbs waits for all vcpus to exit
* guest mode and/or lockless shadow page table walks.
*/
- kvm_flush_remote_tlbs(kvm);
+ if (kvm_available_flush_tlb_with_range()) {
+ list_for_each_entry(sp, invalid_list, link)
+ hlist_add_head(&sp->flush_link, &flush_list);
+
+ kvm_flush_remote_tlbs_with_list(kvm, &flush_list);
+ } else {
+ kvm_flush_remote_tlbs(kvm);
+ }

list_for_each_entry_safe(sp, nsp, invalid_list, link) {
WARN_ON(!sp->role.invalid || sp->root_count);
--
2.14.4
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