Define kvm_flush_remote_tlbs_range() to limit the TLB flush only
to a certain range of addresses. Replace this with the existing
call to kvm_flush_remote_tlbs() in the MMU notifier path.
Architectures such as arm64 can define this to flush only the
necessary addresses, instead of the entire range.
Signed-off-by: Raghavendra Rao Ananta <rananta@xxxxxxxxxx>
---
arch/arm64/kvm/mmu.c | 10 ++++++++++
include/linux/kvm_host.h | 1 +
virt/kvm/kvm_main.c | 7 ++++++-
3 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 39d9a334efb57..70f76bc909c5d 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -91,6 +91,16 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
kvm_call_hyp(__kvm_tlb_flush_vmid, &kvm->arch.mmu);
}
+void kvm_flush_remote_tlbs_range(struct kvm *kvm, unsigned long start, unsigned long end)
+{
+ struct kvm_s2_mmu *mmu = &kvm->arch.mmu;
+
+ if (system_supports_tlb_range())
+ kvm_call_hyp(__kvm_tlb_flush_range_vmid_ipa, mmu, start, end, 0);
+ else
+ kvm_flush_remote_tlbs(kvm);
+}
+
static bool kvm_is_device_pfn(unsigned long pfn)
{
return !pfn_is_map_memory(pfn);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f51eb9419bfc3..a76cede9dc3bb 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1359,6 +1359,7 @@ int kvm_vcpu_yield_to(struct kvm_vcpu *target);
void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool usermode_vcpu_not_eligible);
void kvm_flush_remote_tlbs(struct kvm *kvm);
+void kvm_flush_remote_tlbs_range(struct kvm *kvm, unsigned long start, unsigned long end);
#ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE
int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 03e6a38094c17..f538ecc984f5b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -376,6 +376,11 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
++kvm->stat.generic.remote_tlb_flush;
}
EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
+
+void kvm_flush_remote_tlbs_range(struct kvm *kvm, unsigned long start, unsigned long end)
+{
+ kvm_flush_remote_tlbs(kvm);
+}
#endif
static void kvm_flush_shadow_all(struct kvm *kvm)
@@ -637,7 +642,7 @@ static __always_inline int __kvm_handle_hva_range(struct kvm *kvm,
}
if (range->flush_on_ret && ret)
- kvm_flush_remote_tlbs(kvm);
+ kvm_flush_remote_tlbs_range(kvm, range->start, range->end - 1);
if (locked) {
KVM_MMU_UNLOCK(kvm);
--
2.39.0.314.g84b9a713c41-goog
