From: Peter Xu <peterx@redhat.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>,
Sean Christopherson <seanjc@google.com>,
peterx@redhat.com, Maxim Levitsky <mlevitsk@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: [PATCH v3 2/7] KVM: X86: Introduce pte_list_count() helper
Date: Fri, 30 Jul 2021 18:04:50 -0400 [thread overview]
Message-ID: <20210730220455.26054-3-peterx@redhat.com> (raw)
In-Reply-To: <20210730220455.26054-1-peterx@redhat.com>
This helper is used to count the number of rmap entries in the rmap list
pointed by the kvm_rmap_head.
Signed-off-by: Peter Xu <peterx@redhat.com>
---
arch/x86/kvm/mmu/mmu.c | 21 +++++++++++++++++++++
arch/x86/kvm/mmu/mmu_internal.h | 1 +
2 files changed, 22 insertions(+)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 5429c20cf2cf..16c99f771c9e 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -998,6 +998,27 @@ static void pte_list_remove(struct kvm_rmap_head *rmap_head, u64 *sptep)
__pte_list_remove(sptep, rmap_head);
}
+unsigned int pte_list_count(struct kvm_rmap_head *rmap_head)
+{
+ struct pte_list_desc *desc;
+ unsigned int i, count = 0;
+
+ if (!rmap_head->val)
+ return 0;
+ else if (!(rmap_head->val & 1))
+ return 1;
+
+ desc = (struct pte_list_desc *)(rmap_head->val & ~1ul);
+
+ while (desc) {
+ for (i = 0; (i < PTE_LIST_EXT) && desc->sptes[i]; i++)
+ count++;
+ desc = desc->more;
+ }
+
+ return count;
+}
+
static struct kvm_rmap_head *__gfn_to_rmap(gfn_t gfn, int level,
const struct kvm_memory_slot *slot)
{
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index ca7b7595bbfc..62bb8f758b3f 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -131,6 +131,7 @@ bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
int min_level);
void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
u64 start_gfn, u64 pages);
+unsigned int pte_list_count(struct kvm_rmap_head *rmap_head);
/*
* Return values of handle_mmio_page_fault, mmu.page_fault, and fast_page_fault().
--
2.31.1
next prev parent reply other threads:[~2021-07-30 22:05 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-30 22:04 [PATCH v3 0/7] KVM: X86: Some light optimizations on rmap logic Peter Xu
2021-07-30 22:04 ` [PATCH v3 1/7] KVM: Allow to have arch-specific per-vm debugfs files Peter Xu
2021-08-03 11:15 ` Greg KH
2021-08-03 19:25 ` Peter Xu
2021-07-30 22:04 ` Peter Xu [this message]
2021-07-30 22:04 ` [PATCH v3 3/7] KVM: X86: Introduce kvm_mmu_slot_lpages() helpers Peter Xu
2021-07-30 22:04 ` [PATCH v3 4/7] KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file Peter Xu
2021-08-02 15:25 ` Paolo Bonzini
2021-08-03 19:14 ` Peter Xu
2021-08-05 18:19 ` Sean Christopherson
2021-07-30 22:04 ` [PATCH v3 5/7] KVM: X86: MMU: Tune PTE_LIST_EXT to be bigger Peter Xu
2021-07-30 22:06 ` [PATCH v3 6/7] KVM: X86: Optimize pte_list_desc with per-array counter Peter Xu
2021-07-30 22:06 ` [PATCH v3 7/7] KVM: X86: Optimize zapping rmap Peter Xu
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