[PATCH v8 10/14] KVM: arm64: Define kvm_tlb_flush_vmid_range()

Raghavendra Rao Ananta
2023-08-08T23:14:10Z

Implement the helper kvm_tlb_flush_vmid_range() that acts
as a wrapper for range-based TLB invalidations. For the
given VMID, use the range-based TLBI instructions to do
the job or fallback to invalidating all the TLB entries.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
---
arch/arm64/include/asm/kvm_pgtable.h | 10 ++++++++++
arch/arm64/kvm/hyp/pgtable.c | 20 ++++++++++++++++++++
2 files changed, 30 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index 8294a9a7e566d..5e8b1ff07854b 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -754,4 +754,14 @@ enum kvm_pgtable_prot kvm_pgtable_stage2_pte_prot(kvm_pte_t pte);
* kvm_pgtable_prot format.
*/
enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte);
+
+/**
+ * kvm_tlb_flush_vmid_range() - Invalidate/flush a range of TLB entries
+ *
+ * @mmu: Stage-2 KVM MMU struct
+ * @addr: The base Intermediate physical address from which to invalidate
+ * @size: Size of the range from the base to invalidate
+ */
+void kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu,
+ phys_addr_t addr, size_t size);
#endif /* __ARM64_KVM_PGTABLE_H__ */
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index aa740a974e024..5d14d5d5819a1 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -670,6 +670,26 @@ static bool stage2_has_fwb(struct kvm_pgtable *pgt)
return !(pgt->flags & KVM_PGTABLE_S2_NOFWB);
}

+void kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu,
+ phys_addr_t addr, size_t size)
+{
+ unsigned long pages, inval_pages;
+
+ if (!system_supports_tlb_range()) {
+ kvm_call_hyp(__kvm_tlb_flush_vmid, mmu);
+ return;
+ }
+
+ pages = size >> PAGE_SHIFT;
+ while (pages > 0) {
+ inval_pages = min(pages, MAX_TLBI_RANGE_PAGES);
+ kvm_call_hyp(__kvm_tlb_flush_vmid_range, mmu, addr, inval_pages);
+
+ addr += inval_pages << PAGE_SHIFT;
+ pages -= inval_pages;
+ }
+}
+
#define KVM_S2_MEMATTR(pgt, attr) PAGE_S2_MEMATTR(attr, stage2_has_fwb(pgt))

static int stage2_set_prot_attr(struct kvm_pgtable *pgt, enum kvm_pgtable_prot prot,
--
2.41.0.640.ga95def55d0-goog