linux-kernel - [PATCH v2 1/5] KVM: mm: add a helper to account page table pages used by KVM.

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Date:   Mon,  4 Apr 2022 23:41:50 +0000
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Huacai Chen <chenhuacai@...nel.org>,
        Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        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>
Cc:     mizhang@...gle.com, David Matlack <dmatlack@...gle.com>,
        kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
        linux-mips@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Shakeel Butt <shakeelb@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yosry Ahmed <yosryahmed@...gle.com>
Subject: [PATCH v2 1/5] KVM: mm: add a helper to account page table pages used
 by KVM.

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

Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
---
 include/linux/kvm_host.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 252ee4a61b58..ca46b68e7086 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2221,6 +2221,15 @@ static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu)
 }
 #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */
 
+/*
+ * If nr > 1, we assume virt is the address of the first page of a block of
+ * pages that were allocated together (i.e accounted together).
+ */
+static inline void kvm_account_pgtable_pages(void *virt, int nr)
+{
+	mod_lruvec_page_state(virt_to_page(virt), NR_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
-- 
2.35.1.1094.g7c7d902a7c-goog