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KVM: x86/mmu: Consolidate kvm_mmu_zap_all() and kvm_mmu_zap_mmio_sptes()

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...via a new helper, __kvm_mmu_zap_all().  An alternative to passing a
'bool mmio_only' would be to pass a callback function to filter the
shadow page, i.e. to make __kvm_mmu_zap_all() generic and reusable, but
zapping all shadow pages is a last resort, i.e. making the helper less
extensible is a feature of sorts.  And the explicit MMIO parameter makes
it easy to preserve the WARN_ON_ONCE() if a restart is triggered when
zapping MMIO sptes.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-02-05 13:01:37 -08:00 committed by Paolo Bonzini
parent 24efe61f69
commit 8ab3c471ee
1 changed files with 10 additions and 23 deletions
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33
arch/x86/kvm/mmu.c
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@ -5840,7 +5840,7 @@ void kvm_mmu_slot_set_dirty(struct kvm *kvm,
}
EXPORT_SYMBOL_GPL(kvm_mmu_slot_set_dirty);
void kvm_mmu_zap_all(struct kvm *kvm)
static void __kvm_mmu_zap_all(struct kvm *kvm, bool mmio_only)
{
struct kvm_mmu_page *sp, *node;
LIST_HEAD(invalid_list);
@ -5849,30 +5849,12 @@ void kvm_mmu_zap_all(struct kvm *kvm)
spin_lock(&kvm->mmu_lock);
restart:
list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) {
if (mmio_only && !sp->mmio_cached)
continue;
if (sp->role.invalid && sp->root_count)
continue;
if (__kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list, &ign) ||
cond_resched_lock(&kvm->mmu_lock))
goto restart;
}
kvm_mmu_commit_zap_page(kvm, &invalid_list);
spin_unlock(&kvm->mmu_lock);
}
static void kvm_mmu_zap_mmio_sptes(struct kvm *kvm)
{
struct kvm_mmu_page *sp, *node;
LIST_HEAD(invalid_list);
int ign;
spin_lock(&kvm->mmu_lock);
restart:
list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) {
if (!sp->mmio_cached)
continue;
if (__kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list, &ign)) {
WARN_ON_ONCE(1);
WARN_ON_ONCE(mmio_only);
goto restart;
}
if (cond_resched_lock(&kvm->mmu_lock))
@ -5883,6 +5865,11 @@ restart:
spin_unlock(&kvm->mmu_lock);
}
void kvm_mmu_zap_all(struct kvm *kvm)
{
return __kvm_mmu_zap_all(kvm, false);
}
void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, u64 gen)
{
WARN_ON(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS);
@ -5904,7 +5891,7 @@ void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, u64 gen)
*/
if (unlikely(gen == 0)) {
kvm_debug_ratelimited("kvm: zapping shadow pages for mmio generation wraparound\n");
kvm_mmu_zap_mmio_sptes(kvm);
__kvm_mmu_zap_all(kvm, true);
}
}