linux-kernel - [PATCH v3 6/6] KVM: mips/mmu: count KVM page table pages in pagetable stats

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Date:   Tue, 26 Apr 2022 05:39:04 +0000
From:   Yosry Ahmed <yosryahmed@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        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>,
        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>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Shakeel Butt <shakeelb@...gle.com>,
        James Morse <james.morse@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
        Marc Zyngier <maz@...nel.org>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-mips@...r.kernel.org, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, Yosry Ahmed <yosryahmed@...gle.com>
Subject: [PATCH v3 6/6] KVM: mips/mmu: count KVM page table pages in pagetable stats

Count the pages used by KVM in mips for page tables in pagetable stats.

Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>
---
 arch/mips/kvm/mips.c | 1 +
 arch/mips/kvm/mmu.c  | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index a25e0b73ee70..e60c1920a408 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -175,6 +175,7 @@ static void kvm_mips_free_gpa_pt(struct kvm *kvm)
 {
 	/* It should always be safe to remove after flushing the whole range */
 	WARN_ON(!kvm_mips_flush_gpa_pt(kvm, 0, ~0));
+	kvm_account_pgtable_pages((void *)kvm->arch.gpa_mm.pgd, -1);
 	pgd_free(NULL, kvm->arch.gpa_mm.pgd);
 }
 
diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c
index 1bfd1b501d82..18da2ac2ded7 100644
--- a/arch/mips/kvm/mmu.c
+++ b/arch/mips/kvm/mmu.c
@@ -81,8 +81,10 @@ pgd_t *kvm_pgd_alloc(void)
 	pgd_t *ret;
 
 	ret = (pgd_t *)__get_free_pages(GFP_KERNEL, PGD_ORDER);
-	if (ret)
+	if (ret) {
 		kvm_pgd_init(ret);
+		kvm_account_pgtable_pages((void *)ret, +1);
+	}
 
 	return ret;
 }
@@ -125,6 +127,7 @@ static pte_t *kvm_mips_walk_pgd(pgd_t *pgd, struct kvm_mmu_memory_cache *cache,
 		pmd_init((unsigned long)new_pmd,
 			 (unsigned long)invalid_pte_table);
 		pud_populate(NULL, pud, new_pmd);
+		kvm_account_pgtable_pages((void *)new_pmd, +1);
 	}
 	pmd = pmd_offset(pud, addr);
 	if (pmd_none(*pmd)) {
@@ -135,6 +138,7 @@ static pte_t *kvm_mips_walk_pgd(pgd_t *pgd, struct kvm_mmu_memory_cache *cache,
 		new_pte = kvm_mmu_memory_cache_alloc(cache);
 		clear_page(new_pte);
 		pmd_populate_kernel(NULL, pmd, new_pte);
+		kvm_account_pgtable_pages((void *)new_pte, +1);
 	}
 	return pte_offset_kernel(pmd, addr);
 }
@@ -189,6 +193,7 @@ static bool kvm_mips_flush_gpa_pmd(pmd_t *pmd, unsigned long start_gpa,
 
 		if (kvm_mips_flush_gpa_pte(pte, start_gpa, end)) {
 			pmd_clear(pmd + i);
+			kvm_account_pgtable_pages((void *)pte, -1);
 			pte_free_kernel(NULL, pte);
 		} else {
 			safe_to_remove = false;
@@ -217,6 +222,7 @@ static bool kvm_mips_flush_gpa_pud(pud_t *pud, unsigned long start_gpa,
 
 		if (kvm_mips_flush_gpa_pmd(pmd, start_gpa, end)) {
 			pud_clear(pud + i);
+			kvm_account_pgtable_pages((void *)pmd, -1);
 			pmd_free(NULL, pmd);
 		} else {
 			safe_to_remove = false;
@@ -247,6 +253,7 @@ static bool kvm_mips_flush_gpa_pgd(pgd_t *pgd, unsigned long start_gpa,
 
 		if (kvm_mips_flush_gpa_pud(pud, start_gpa, end)) {
 			pgd_clear(pgd + i);
+			kvm_account_pgtable_pages((void *)pud, -1);
 			pud_free(NULL, pud);
 		} else {
 			safe_to_remove = false;
-- 
2.36.0.rc2.479.g8af0fa9b8e-goog