linux-kernel - [PATCH] KVM: arm64: Count pKVM stage-2 usage in secondary pagetable stats

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Message-ID: <20250228121355.1377891-1-vdonnefort@google.com>
Date: Fri, 28 Feb 2025 12:13:55 +0000
From: Vincent Donnefort <vdonnefort@...gle.com>
To: maz@...nel.org, oliver.upton@...ux.dev, joey.gouly@....com, 
	suzuki.poulose@....com, yuzenghui@...wei.com, catalin.marinas@....com, 
	will@...nel.org
Cc: qperret@...gle.com, linux-arm-kernel@...ts.infradead.org, 
	kvmarm@...ts.linux.dev, linux-kernel@...r.kernel.org, kernel-team@...roid.com, 
	Vincent Donnefort <vdonnefort@...gle.com>
Subject: [PATCH] KVM: arm64: Count pKVM stage-2 usage in secondary pagetable stats

Count the pages used by pKVM for the guest stage-2 in memory stats under
secondary pagetable stats, similarly to what the VHE mode does.

Signed-off-by: Vincent Donnefort <vdonnefort@...gle.com>

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 1f55b0c7b11d..c2e022c41313 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1088,12 +1088,18 @@ void kvm_free_stage2_pgd(struct kvm_s2_mmu *mmu)
 
 static void hyp_mc_free_fn(void *addr, void *unused)
 {
+	kvm_account_pgtable_pages(addr, -1);
 	free_page((unsigned long)addr);
 }
 
 static void *hyp_mc_alloc_fn(void *unused)
 {
-	return (void *)__get_free_page(GFP_KERNEL_ACCOUNT);
+	void *addr = (void *)__get_free_page(GFP_KERNEL_ACCOUNT);
+
+	if (addr)
+		kvm_account_pgtable_pages(addr, 1);
+
+	return addr;
 }
 
 void free_hyp_memcache(struct kvm_hyp_memcache *mc)

base-commit: d082ecbc71e9e0bf49883ee4afd435a77a5101b6
-- 
2.48.1.711.g2feabab25a-goog