[PATCH v8 11/11] KVM: MMU: reduce KVM_REQ_MMU_RELOAD when root page is zapped
From: Gleb Natapov
Quote Gleb's mail:
| why don't we check for sp->role.invalid in
| kvm_mmu_prepare_zap_page before calling kvm_reload_remote_mmus()?
and
| Actually we can add check for is_obsolete_sp() there too since
| kvm_mmu_invalidate_all_pages() already calls kvm_reload_remote_mmus()
| after incrementing mmu_valid_gen.
[ Xiao: add some comments and the check of is_obsolete_sp() ]
Signed-off-by: Gleb Natapov
Signed-off-by: Xiao Guangrong
---
arch/x86/kvm/mmu.c |8 +++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 79af88a..6941fa7 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2108,7 +2108,13 @@ static int kvm_mmu_prepare_zap_page(struct kvm *kvm,
struct kvm_mmu_page *sp,
kvm_mod_used_mmu_pages(kvm, -1);
} else {
list_move(>link, >arch.active_mmu_pages);
- kvm_reload_remote_mmus(kvm);
+
+ /*
+* The obsolete pages can not be used on any vcpus.
+* See the comments in kvm_mmu_invalidate_zap_all_pages().
+*/
+ if (!sp->role.invalid && !is_obsolete_sp(kvm, sp))
+ kvm_reload_remote_mmus(kvm);
}
sp->role.invalid = 1;
--
1.7.7.6
--
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[PATCH v8 11/11] KVM: MMU: reduce KVM_REQ_MMU_RELOAD when root page is zapped
From: Gleb Natapov g...@redhat.com
Quote Gleb's mail:
| why don't we check for sp-role.invalid in
| kvm_mmu_prepare_zap_page before calling kvm_reload_remote_mmus()?
and
| Actually we can add check for is_obsolete_sp() there too since
| kvm_mmu_invalidate_all_pages() already calls kvm_reload_remote_mmus()
| after incrementing mmu_valid_gen.
[ Xiao: add some comments and the check of is_obsolete_sp() ]
Signed-off-by: Gleb Natapov g...@redhat.com
Signed-off-by: Xiao Guangrong xiaoguangr...@linux.vnet.ibm.com
---
arch/x86/kvm/mmu.c |8 +++-
1 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 79af88a..6941fa7 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2108,7 +2108,13 @@ static int kvm_mmu_prepare_zap_page(struct kvm *kvm,
struct kvm_mmu_page *sp,
kvm_mod_used_mmu_pages(kvm, -1);
} else {
list_move(sp-link, kvm-arch.active_mmu_pages);
- kvm_reload_remote_mmus(kvm);
+
+ /*
+* The obsolete pages can not be used on any vcpus.
+* See the comments in kvm_mmu_invalidate_zap_all_pages().
+*/
+ if (!sp-role.invalid !is_obsolete_sp(kvm, sp))
+ kvm_reload_remote_mmus(kvm);
}
sp-role.invalid = 1;
--
1.7.7.6
--
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