lkml.org 
[lkml]   [2019]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V3 7/10] KVM: Use tlb range flush in the kvm_vm_ioctl_get/clear_dirty_log()
Date
From: Lan Tianyu <Tianyu.Lan@microsoft.com>

This patch is to use tlb range flush to flush memslot's in the
kvm_vm_ioctl_get/clear_dirty_log() instead of flushing tlbs
of entire ept page table when range flush is available.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
arch/x86/kvm/mmu.c | 8 +-------
arch/x86/kvm/mmu.h | 7 +++++++
arch/x86/kvm/x86.c | 16 ++++++++++++----
3 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 60b1771e400e..e9a727aad603 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -266,12 +266,6 @@ 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)
{
@@ -284,7 +278,7 @@ static void kvm_flush_remote_tlbs_with_range(struct kvm *kvm,
kvm_flush_remote_tlbs(kvm);
}

-static void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
+void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
u64 start_gfn, u64 pages)
{
struct kvm_tlb_range range;
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index bbdc60f2fae8..5e0d9418b912 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -63,6 +63,13 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly,
bool kvm_can_do_async_pf(struct kvm_vcpu *vcpu);
int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
u64 fault_address, char *insn, int insn_len);
+void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
+ u64 start_gfn, u64 pages);
+
+static inline bool kvm_available_flush_tlb_with_range(void)
+{
+ return kvm_x86_ops->tlb_remote_flush_with_range;
+}

static inline unsigned int kvm_mmu_available_pages(struct kvm *kvm)
{
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 40d8272bee96..35738a7256f4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4448,9 +4448,13 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
* kvm_mmu_slot_remove_write_access().
*/
lockdep_assert_held(&kvm->slots_lock);
- if (flush)
- kvm_flush_remote_tlbs(kvm);
+ if (flush) {
+ struct kvm_memory_slot *memslot = kvm_get_memslot(kvm,
+ log->slot);

+ kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+ memslot->npages);
+ }
mutex_unlock(&kvm->slots_lock);
return r;
}
@@ -4475,9 +4479,13 @@ int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, struct kvm_clear_dirty_log *lo
* kvm_mmu_slot_remove_write_access().
*/
lockdep_assert_held(&kvm->slots_lock);
- if (flush)
- kvm_flush_remote_tlbs(kvm);
+ if (flush) {
+ struct kvm_memory_slot *memslot = kvm_get_memslot(kvm,
+ log->slot);

+ kvm_flush_remote_tlbs_with_address(kvm, memslot->base_gfn,
+ memslot->npages);
+ }
mutex_unlock(&kvm->slots_lock);
return r;
}
--
2.14.4
\
 
 \ /
  Last update: 2019-02-22 16:08    [W:0.083 / U:1.500 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site