From: Peter Xu <peterx@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
peterx@redhat.com, Maxim Levitsky <mlevitsk@redhat.com>
Subject: [PATCH v2 4/9] KVM: X86: Introduce pte_list_count() helper
Date: Fri, 25 Jun 2021 11:32:09 -0400 [thread overview]
Message-ID: <20210625153214.43106-5-peterx@redhat.com> (raw)
In-Reply-To: <20210625153214.43106-1-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 eb16c1dbbb32..b3f738a7c05e 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -990,6 +990,27 @@ 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,
struct kvm_memory_slot *slot)
{
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 35567293c1fd..325b4242deed 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:[~2021-06-25 15:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-25 15:32 [PATCH v2 0/9] KVM: X86: Some light optimizations on rmap logic Peter Xu
2021-06-25 15:32 ` [PATCH v2 1/9] KVM: X86: Add per-vm stat for max rmap list size Peter Xu
2021-06-25 15:32 ` [PATCH v2 2/9] KVM: Introduce kvm_get_kvm_safe() Peter Xu
2021-07-26 13:42 ` Paolo Bonzini
2021-06-25 15:32 ` [PATCH v2 3/9] KVM: Allow to have arch-specific per-vm debugfs files Peter Xu
2021-06-25 15:32 ` Peter Xu [this message]
2021-06-25 15:32 ` [PATCH v2 5/9] KVM: X86: Introduce kvm_mmu_slot_lpages() helpers Peter Xu
2021-06-25 15:32 ` [PATCH v2 6/9] KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file Peter Xu
2021-06-25 15:34 ` [PATCH v2 7/9] KVM: X86: MMU: Tune PTE_LIST_EXT to be bigger Peter Xu
2021-07-28 21:01 ` Sean Christopherson
2021-06-25 15:34 ` [PATCH v2 8/9] KVM: X86: Optimize pte_list_desc with per-array counter Peter Xu
2021-07-28 21:04 ` Sean Christopherson
2021-07-28 21:51 ` Peter Xu
2021-07-29 9:33 ` Paolo Bonzini
2021-07-29 15:53 ` Peter Xu
2021-07-30 15:45 ` Peter Xu
2021-06-25 15:34 ` [PATCH v2 9/9] KVM: X86: Optimize zapping rmap Peter Xu
2021-07-28 21:39 ` Sean Christopherson
2021-07-28 22:01 ` Peter Xu
2021-07-28 22:31 ` Sean Christopherson
2021-07-29 9:35 ` Paolo Bonzini
2021-07-26 13:05 ` [PATCH v2 0/9] KVM: X86: Some light optimizations on rmap logic Paolo Bonzini
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