Re: [RESEND PATCH v5 07/11] KVM: arm64: Define kvm_tlb_flush_vmid_range()

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On 7/6/23 04:28, Raghavendra Rao Ananta wrote:
On Tue, Jul 4, 2023 at 5:31 PM Gavin Shan <gshan@xxxxxxxxxx> wrote:
On 6/22/23 03:49, Raghavendra Rao Ananta wrote:
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@xxxxxxxxxx>
---
   arch/arm64/include/asm/kvm_pgtable.h | 10 ++++++++++
   arch/arm64/kvm/hyp/pgtable.c         | 20 ++++++++++++++++++++
   2 files changed, 30 insertions(+)


It may be reasonable to fold this to PATCH[08/11] since kvm_tlb_flush_vmid_range() is
only called by ARM64's kvm_arch_flush_remote_tlbs_range(), which is added by PATCH[08/11].
In either way, the changes look good to me:

Ah, the patches 10 and 11 also call kvm_tlb_flush_vmid_range(), so
probably it's better to keep the definition isolated?


Thanks for your explanation. It's fine to have two separate patches in this
case. I still need to spend some time to look at PATCH[11/11] whose subject
includes typo (intructions -> instructions)

Thanks,
Gavin

Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx>

diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index 4cd6762bda805..1b12295a83595 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -682,4 +682,14 @@ 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 3d61bd3e591d2..df8ac14d9d3d4 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -631,6 +631,26 @@ 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,




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