[PATCH v2 4/7] KVM: arm64: Implement kvm_arch_flush_remote_tlbs_range()

Raghavendra Rao Ananta
2023-02-06T17:24:16Z

Implement kvm_arch_flush_remote_tlbs_range() for arm64,
such that it can utilize the TLBI range based instructions
if supported.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
---
arch/arm64/include/asm/kvm_host.h | 3 +++
arch/arm64/kvm/mmu.c | 15 +++++++++++++++
2 files changed, 18 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index dee530d75b957..211fab0c1de74 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -1002,6 +1002,9 @@ struct kvm *kvm_arch_alloc_vm(void);
#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS
int kvm_arch_flush_remote_tlbs(struct kvm *kvm);

+#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
+int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages);
+
static inline bool kvm_vm_is_protected(struct kvm *kvm)
{
return false;
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index e98910a8d0af6..409cb187f4911 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -91,6 +91,21 @@ int kvm_arch_flush_remote_tlbs(struct kvm *kvm)
return 0;
}

+int kvm_arch_flush_remote_tlbs_range(struct kvm *kvm, gfn_t start_gfn, u64 pages)
+{
+ phys_addr_t start, end;
+
+ if (!system_supports_tlb_range())
+ return -EOPNOTSUPP;
+
+ start = start_gfn << PAGE_SHIFT;
+ end = (start_gfn + pages) << PAGE_SHIFT;
+
+ kvm_call_hyp(__kvm_tlb_flush_range_vmid_ipa, &kvm->arch.mmu,
+ start, end, KVM_PGTABLE_MAX_LEVELS - 1, 0);
+ return 0;
+}
+
static bool kvm_is_device_pfn(unsigned long pfn)
{
return !pfn_is_map_memory(pfn);
--
2.39.1.519.gcb327c4b5f-goog