linux-kernel - [PATCH v7 2/4] KVM: mmu: add a helper to account memory used by KVM MMU.

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Message-Id: <20220823004639.2387269-3-yosryahmed@google.com>
Date:   Tue, 23 Aug 2022 00:46:37 +0000
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        Oliver Upton <oupton@...gle.com>
Cc:     Huang@...gle.com, Shaoqin <shaoqin.huang@...el.com>,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-mm@...ck.org,
        Yosry Ahmed <yosryahmed@...gle.com>
Subject: [PATCH v7 2/4] KVM: mmu: add a helper to account memory used by KVM MMU.

Add a helper to account pages used by KVM for page tables in memory
secondary pagetable stats. This function will be used by subsequent
patches in different archs.

Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
Acked-by: Marc Zyngier <maz@...nel.org>
---
 include/linux/kvm_host.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f4519d3689e1..04c7e5f2f727 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2247,6 +2247,19 @@ static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu)
 }
 #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */
 
+/*
+ * If more than one page is being (un)accounted, @virt must be the address of
+ * the first page of a block of pages what were allocated together (i.e
+ * accounted together).
+ *
+ * kvm_account_pgtable_pages() is thread-safe because mod_lruvec_page_state()
+ * is thread-safe.
+ */
+static inline void kvm_account_pgtable_pages(void *virt, int nr)
+{
+	mod_lruvec_page_state(virt_to_page(virt), NR_SECONDARY_PAGETABLE, nr);
+}
+
 /*
  * This defines how many reserved entries we want to keep before we
  * kick the vcpu to the userspace to avoid dirty ring full.  This
-- 
2.37.1.595.g718a3a8f04-goog