[PATCH V2 05/10] KVM: X86: Remove kvm_mmu_flush_or_zap()

Lai Jiangshan
2021-09-18T00:57:10Z

Because local_flush is useless, kvm_mmu_flush_or_zap() can be removed
and kvm_mmu_remote_flush_or_zap is used instead.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
---
arch/x86/kvm/mmu/mmu.c | 26 ++++++--------------------
1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index f40087ee2704..9aba5d93a747 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -1928,14 +1928,6 @@ static bool kvm_mmu_remote_flush_or_zap(struct kvm *kvm,
return true;
}

-static void kvm_mmu_flush_or_zap(struct kvm_vcpu *vcpu,
- struct list_head *invalid_list,
- bool remote_flush, bool local_flush)
-{
- if (kvm_mmu_remote_flush_or_zap(vcpu->kvm, invalid_list, remote_flush))
- return;
-}
-
#ifdef CONFIG_KVM_MMU_AUDIT
#include "mmu_audit.c"
#else
@@ -2029,7 +2021,6 @@ static int mmu_sync_children(struct kvm_vcpu *vcpu,
struct mmu_page_path parents;
struct kvm_mmu_pages pages;
LIST_HEAD(invalid_list);
- bool flush = false;

while (mmu_unsync_walk(parent, &pages)) {
bool protected = false;
@@ -2039,25 +2030,23 @@ static int mmu_sync_children(struct kvm_vcpu *vcpu,

if (protected) {
kvm_flush_remote_tlbs(vcpu->kvm);
- flush = false;
}

for_each_sp(pages, sp, parents, i) {
kvm_unlink_unsync_page(vcpu->kvm, sp);
- flush |= kvm_sync_page(vcpu, sp, &invalid_list);
+ kvm_sync_page(vcpu, sp, &invalid_list);
mmu_pages_clear_parents(&parents);
}
if (need_resched() || rwlock_needbreak(&vcpu->kvm->mmu_lock)) {
- kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
+ kvm_mmu_remote_flush_or_zap(vcpu->kvm, &invalid_list, false);
if (!can_yield)
return -EINTR;

cond_resched_rwlock_write(&vcpu->kvm->mmu_lock);
- flush = false;
}
}

- kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
+ kvm_mmu_remote_flush_or_zap(vcpu->kvm, &invalid_list, false);
return 0;
}

@@ -5146,7 +5135,7 @@ static void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
LIST_HEAD(invalid_list);
u64 entry, gentry, *spte;
int npte;
- bool remote_flush, local_flush;
+ bool flush = false;

/*
* If we don't have indirect shadow pages, it means no page is
@@ -5155,8 +5144,6 @@ static void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
if (!READ_ONCE(vcpu->kvm->arch.indirect_shadow_pages))
return;

- remote_flush = local_flush = false;
-
pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes);

/*
@@ -5185,18 +5172,17 @@ static void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
if (!spte)
continue;

- local_flush = true;
while (npte--) {
entry = *spte;
mmu_page_zap_pte(vcpu->kvm, sp, spte, NULL);
if (gentry && sp->role.level != PG_LEVEL_4K)
++vcpu->kvm->stat.mmu_pde_zapped;
if (need_remote_flush(entry, *spte))
- remote_flush = true;
+ flush = true;
++spte;
}
}
- kvm_mmu_flush_or_zap(vcpu, &invalid_list, remote_flush, local_flush);
+ kvm_mmu_remote_flush_or_zap(vcpu->kvm, &invalid_list, flush);
kvm_mmu_audit(vcpu, AUDIT_POST_PTE_WRITE);
write_unlock(&vcpu->kvm->mmu_lock);
}
--
2.19.1.6.gb485710b