From: Peter Xu <peterx@redhat.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Maxim Levitsky <mlevitsk@redhat.com>,
peterx@redhat.com, Sean Christopherson <seanjc@google.com>
Subject: [PATCH 4/9] KVM: X86: Introduce pte_list_count() helper
Date: Thu, 24 Jun 2021 14:13:51 -0400 [thread overview]
Message-ID: <20210624181356.10235-5-peterx@redhat.com> (raw)
In-Reply-To: <20210624181356.10235-1-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 6dd338738118..80263ecb1de3 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -927,6 +927,27 @@ 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 d64ccb417c60..3cd1a878ffeb 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -126,6 +126,7 @@ bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
struct kvm_memory_slot *slot, u64 gfn);
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:[~2021-06-24 18:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 18:13 [PATCH 0/9] KVM: X86: Some light optimizations on rmap logic Peter Xu
2021-06-24 18:13 ` [PATCH 1/9] KVM: X86: Add per-vm stat for max rmap list size Peter Xu
2021-06-24 18:13 ` [PATCH 2/9] KVM: Introduce kvm_get_kvm_safe() Peter Xu
2021-06-24 18:13 ` [PATCH 3/9] KVM: Allow to have arch-specific per-vm debugfs files Peter Xu
2021-06-24 18:13 ` Peter Xu [this message]
2021-06-24 18:13 ` [PATCH 5/9] KVM: X86: Introduce kvm_mmu_slot_lpages() helpers Peter Xu
2021-06-24 18:13 ` [PATCH 6/9] KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file Peter Xu
2021-06-24 18:22 ` Peter Xu
2021-06-24 18:13 ` [PATCH 7/9] KVM: X86: MMU: Tune PTE_LIST_EXT to be bigger Peter Xu
2021-06-24 18:15 ` [PATCH 8/9] KVM: X86: Optimize pte_list_desc with per-array counter Peter Xu
2021-06-24 22:53 ` Peter Xu
2021-06-24 18:15 ` [PATCH 9/9] KVM: X86: Optimize zapping rmap Peter Xu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210624181356.10235-5-peterx@redhat.com \
--to=peterx@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mlevitsk@redhat.com \
--cc=pbonzini@redhat.com \
--cc=seanjc@google.com \
--cc=vkuznets@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.