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KVM: MMU: move TLB flush out of __kvm_sync_page 

By doing this, kvm_sync_pages can use __kvm_sync_page instead of
reinventing it.  Because of kvm_mmu_flush_or_zap, the code does not
end up being more complex than before, and more cleanups to kvm_sync_pages
will come in the next patches.

Reviewed-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-02-24 10:03:27 +01:00
parent b8c67b7a08
commit 35a70510ee
1 changed files with 24 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
arch/x86/kvm/mmu.c
View File

@ -1932,10 +1932,24 @@ static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
return 1;
}
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
return 0;
}
static void kvm_mmu_flush_or_zap(struct kvm_vcpu *vcpu,
struct list_head *invalid_list,
bool remote_flush, bool local_flush)
{
if (!list_empty(invalid_list)) {
kvm_mmu_commit_zap_page(vcpu->kvm, invalid_list);
return;
}
if (remote_flush)
kvm_flush_remote_tlbs(vcpu->kvm);
else if (local_flush)
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
}
static int kvm_sync_page_transient(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp)
{
@ -1943,8 +1957,7 @@ static int kvm_sync_page_transient(struct kvm_vcpu *vcpu,
int ret;
ret = __kvm_sync_page(vcpu, sp, &invalid_list, false);
if (ret)
kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, !ret);
return ret;
}
@ -1975,17 +1988,11 @@ static void kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn)
WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL);
kvm_unlink_unsync_page(vcpu->kvm, s);
if ((s->role.cr4_pae != !!is_pae(vcpu)) ||
(vcpu->arch.mmu.sync_page(vcpu, s))) {
kvm_mmu_prepare_zap_page(vcpu->kvm, s, &invalid_list);
continue;
}
flush = true;
if (!__kvm_sync_page(vcpu, s, &invalid_list, false))
flush = true;
}
kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
if (flush)
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
}
struct mmu_page_path {
@ -2071,6 +2078,7 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu,
while (mmu_unsync_walk(parent, &pages)) {
bool protected = false;
bool flush = false;
for_each_sp(pages, sp, parents, i)
protected |= rmap_write_protect(vcpu, sp->gfn);
@ -2079,10 +2087,12 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu,
kvm_flush_remote_tlbs(vcpu->kvm);
for_each_sp(pages, sp, parents, i) {
kvm_sync_page(vcpu, sp, &invalid_list);
if (!kvm_sync_page(vcpu, sp, &invalid_list))
flush = true;
mmu_pages_clear_parents(&parents);
}
kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
cond_resched_lock(&vcpu->kvm->mmu_lock);
}
}
@ -4188,21 +4198,6 @@ static bool need_remote_flush(u64 old, u64 new)
return (old & ~new & PT64_PERM_MASK) != 0;
}
static void kvm_mmu_flush_or_zap(struct kvm_vcpu *vcpu,
struct list_head *invalid_list,
bool remote_flush, bool local_flush)
{
if (!list_empty(invalid_list)) {
kvm_mmu_commit_zap_page(vcpu->kvm, invalid_list);
return;
}
if (remote_flush)
kvm_flush_remote_tlbs(vcpu->kvm);
else if (local_flush)
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
}
static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa,
const u8 *new, int *bytes)
{