Add some counter for when a dpage get invalidated. The counter isn't
in the function that actually do it though because it doesn't have
either a kvm or vcpu argument, so we would have no way to access the
counters. For this reason, the counter have been added to the calling
functions instead.
Signed-off-by: Yoan Picchi <yoan.picchi@xxxxxxx>
---
arch/arm64/include/asm/kvm_host.h | 1 +
arch/arm64/kvm/guest.c | 1 +
arch/arm64/kvm/mmu.c | 5 ++++-
3 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 863603285..3609aa89d 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -547,6 +547,7 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
struct kvm_vm_stat {
ulong remote_tlb_flush;
+ ulong cached_page_invalidated;
};
struct kvm_vcpu_stat {
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 1029976ca..f6b1f0b63 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -41,6 +41,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("regular_page_mapped", regular_page_mapped),
VCPU_STAT("huge_page_mapped", huge_page_mapped),
VM_STAT("remote_tlb_flush", remote_tlb_flush),
+ VM_STAT("cached_page_invalidated", cached_page_invalidated),
VCPU_STAT("exits", exits),
VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 55d7fe63b..d6ddf5ab8 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -893,8 +893,10 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
if (writable)
prot |= KVM_PGTABLE_PROT_W;
- if (fault_status != FSC_PERM && !device)
+ if (fault_status != FSC_PERM && !device) {
clean_dcache_guest_page(pfn, vma_pagesize);
+ kvm->stat.cached_page_invalidated++;
+ }
if (exec_fault) {
prot |= KVM_PGTABLE_PROT_X;
@@ -1166,6 +1168,7 @@ int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
* just like a translation fault and clean the cache to the PoC.
*/
clean_dcache_guest_page(pfn, PAGE_SIZE);
+ kvm->stat.cached_page_invalidated++;
handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &pfn);
return 0;
}
--
2.17.1
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