Re: [RESEND PATCH v5 07/11] KVM: arm64: Define kvm_tlb_flush_vmid_range()
From: Gavin Shan
Date: Thu Jul 13 2023 - 21:03:24 EST
Hi Raghavendra,
On 7/14/23 04:47, Raghavendra Rao Ananta wrote:
On Wed, Jul 5, 2023 at 5:04 PM Gavin Shan <gshan@xxxxxxxxxx> wrote:
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)
I'm planning to send v6 soon, but I'm happy to wait if you have any
other comments on v5 patch-11.
Appreciate your help with the reviews.
I didn't get a chance to look at PATCH[11/11] yet. Please post v6 and I will
take a look on PATCH[v6 11/11]. Sorry for the delay.
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,