[PATCH 3/4] KVM: MIPS: let generic code call prepare_flush_shadow

Paolo Bonzini
2021-04-02T15:58:16Z

Since all calls to kvm_flush_remote_tlbs must be preceded by
kvm_mips_callbacks->prepare_flush_shadow, repurpose
kvm_arch_flush_remote_tlb to invoke it. This makes it possible
to use the TLB flushing mechanism provided by the generic MMU
notifier code.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/mips/include/asm/kvm_host.h | 3 +++
arch/mips/kvm/mips.c | 11 ++++++-----
arch/mips/kvm/mmu.c | 6 +-----
3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 6c8c0ab53be2..d0944a75fc8d 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -1142,4 +1142,7 @@ static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}

+#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB
+int kvm_arch_flush_remote_tlb(struct kvm *kvm);
+
#endif /* __MIPS_KVM_HOST_H__ */
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 867b8de0fc07..4a22ba70c943 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -204,9 +204,6 @@ void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
/* Flush whole GPA */
kvm_mips_flush_gpa_pt(kvm, 0, ~0);
-
- /* Let implementation do the rest */
- kvm_mips_callbacks->prepare_flush_shadow(kvm);
kvm_flush_remote_tlbs(kvm);
}

@@ -995,11 +992,15 @@ void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)

}

+int kvm_arch_flush_remote_tlb(struct kvm *kvm)
+{
+ kvm_mips_callbacks->prepare_flush_shadow(kvm);
+ return 1;
+}
+
void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
const struct kvm_memory_slot *memslot)
{
- /* Let implementation handle TLB/GVA invalidation */
- kvm_mips_callbacks->prepare_flush_shadow(kvm);
kvm_flush_remote_tlbs(kvm);
}

diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index 7e055e5dfd3c..2cedf908d744 100644
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -490,8 +490,6 @@ int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end,
unsigned flags)
{
handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL);
-
- kvm_mips_callbacks->prepare_flush_shadow(kvm);
kvm_flush_remote_tlbs(kvm);
return 0;
}
@@ -533,10 +531,8 @@ int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
int ret;

ret = handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &pte);
- if (ret) {
- kvm_mips_callbacks->prepare_flush_shadow(kvm);
+ if (ret)
kvm_flush_remote_tlbs(kvm);
- }
return 0;
}

--
2.30.1