kvm_mmu_get_page is the only caller of kvm_sync_page_transient
and kvm_sync_pages. Moving the handling of the invalid_list there
removes the need for the underdocumented kvm_sync_page_transient
function.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
Guangrong, at this point I am confused about why
kvm_sync_page_transient didn't clear sp->unsync. Do
you remember? Or perhaps kvm_mmu_get_page could just
call kvm_sync_page now?
Also, can you explain the need_sync variable in
kvm_mmu_get_page?
arch/x86/kvm/mmu.c | 43 ++++++++++++++++++++++---------------------
1 file changed, 22 insertions(+), 21 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index e3215cc89d97..725316df32ec 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1917,18 +1917,6 @@ static void kvm_mmu_flush_or_zap(struct kvm_vcpu *vcpu,
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
}
-static bool kvm_sync_page_transient(struct kvm_vcpu *vcpu,
- struct kvm_mmu_page *sp)
-{
- LIST_HEAD(invalid_list);
- int ret;
-
- ret = __kvm_sync_page(vcpu, sp, &invalid_list);
- kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, ret);
-
- return ret;
-}
-
#ifdef CONFIG_KVM_MMU_AUDIT
#include "mmu_audit.c"
#else
@@ -1944,21 +1932,21 @@ static bool kvm_sync_page(struct kvm_vcpu *vcpu, struct
kvm_mmu_page *sp,
}
/* @gfn should be write-protected at the call site */
-static void kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn)
+static bool kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn,
+ struct list_head *invalid_list)
{
struct kvm_mmu_page *s;
- LIST_HEAD(invalid_list);
- bool flush = false;
+ bool ret = false;
for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) {
if (!s->unsync)
continue;
WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL);
- flush |= kvm_sync_page(vcpu, s, &invalid_list);
+ ret |= kvm_sync_page(vcpu, s, invalid_list);
}
- kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
+ return ret;
}
struct mmu_page_path {
@@ -2089,6 +2077,8 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct
kvm_vcpu *vcpu,
unsigned quadrant;
struct kvm_mmu_page *sp;
bool need_sync = false;
+ bool flush = false;
+ LIST_HEAD(invalid_list);
role = vcpu->arch.mmu.base_role;
role.level = level;
@@ -2112,8 +2103,16 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct
kvm_vcpu *vcpu,
if (sp->role.word != role.word)
continue;
- if (sp->unsync && !kvm_sync_page_transient(vcpu, sp))
- break;
+ if (sp->unsync) {
+ /* The page is good, but __kvm_sync_page might still end
+ * up zapping it. If so, break in order to rebuild it.
+ */
+ if (!__kvm_sync_page(vcpu, sp, &invalid_list))
+ break;
+
+ WARN_ON(!list_empty(&invalid_list));
+ kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+ }
if (sp->unsync_children)
kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
@@ -2133,13 +2132,15 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct
kvm_vcpu *vcpu,
if (rmap_write_protect(vcpu, gfn))
kvm_flush_remote_tlbs(vcpu->kvm);
if (level > PT_PAGE_TABLE_LEVEL && need_sync)
- kvm_sync_pages(vcpu, gfn);
+ flush |= kvm_sync_pages(vcpu, gfn, &invalid_list);
account_shadowed(vcpu->kvm, sp);
}
sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen;
clear_page(sp->spt);
trace_kvm_mmu_get_page(sp, true);
+
+ kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
return sp;
}
--
1.8.3.1
