From nobody Thu Dec 18 07:15:12 2025 Received: from mail-wm1-f73.google.com (mail-wm1-f73.google.com [209.85.128.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5D51D266EE9 for ; Thu, 13 Mar 2025 11:40:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741866053; cv=none; b=kbuxP5cCM8VKkIZhjFigkyIgpEHPbu31yU98Q7cNS3pAB+uIDxbZvvkJLKKub1NsVOAmML6GS7x/HCKEt2sGyulB4ohiz9hOwcZZGkO+2MLeS0lBFDXlcRM5SG3LDWUn6OL9dCHWfmI/gbmCuFAXr+BJR8q8y2EZaH8ZLxDxtno= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741866053; c=relaxed/simple; bh=8L40uIOd9N+HOMn5n1S03oOWzS9Nj8POq5v8izGudb0=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=eOpx6g/mYu+ECvsJiE5Grhv9DR3jNtZuuyzosDi5a2wL/4mce8yGbgYHoz8tCPFj21c9Qgk+dAU6NJ26t4cLAtTinlPm4BAjDz0sHquVDeRBIMRvZ2N6663DJQ9Y9y/NEnbD4Ea7O/iEBstcVtXRyOry/u/4peE/Eu5AQJgZ+Rg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=j7o5w6pY; arc=none smtp.client-ip=209.85.128.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--vdonnefort.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="j7o5w6pY" Received: by mail-wm1-f73.google.com with SMTP id 5b1f17b1804b1-43943bd1409so6402905e9.3 for ; Thu, 13 Mar 2025 04:40:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1741866049; x=1742470849; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=dVJVlv+KRiLMqpaJQOXgQktnx0DyjzlKOnB26dCdeT4=; b=j7o5w6pYVTw15JhfDo5zyicRSaThO2x4YM+x+pSlWZWj24flxqo+LFlPf9rMJO4HRa ZVB1ye+ScLRovYMQFSlNQHA5nYzDSVYuTAcLctYLWizx3gNJi3o5Fe2q9IjNjwOkxagW rCq7F4JUkOoOEhNuyTOqD2NuiUY6DKMGwSXJQT7B+Qr7vZ2VBx8Ugbf/3t1UvJNY7pLM uNZNMAXO20enTDBbSrvjtzL5nTpWli0yZHwRIcGxKnL39HcN8TVzqcPGoIpzgi1gjO0T 5CETYM7pq5GjEdOEaJrrb+hcJ2Xi9rHwhiYYt9122abMfVuPCmeTY9kxKpZijGgsrRve rxkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741866049; x=1742470849; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=dVJVlv+KRiLMqpaJQOXgQktnx0DyjzlKOnB26dCdeT4=; b=cJYQ224mAoN5erfLleQWLNRWGQEKYkIEJJFImxbouUmzYlONCSMJvpFVKDeKDV4pRX AI5eKoj8XWDYMU9KVSduPeg9Ei0qSSbLqGuCcN7todUqmir9jzvQLB534+SxhuLxjggj 8UKooCCdbk2e+h/RQqzRYCw/sQOhc3qCv9Uz/avTX51/wsoEWLTCJbPiusDQF4T7q6/m MQm0RU1b8BjS0PlbPGI98p3fZ/mHckPFQl3aZtmd2nvn6tYW/2YaHR7yJuw9roswLoXp cSgWJ7fqr4U/FfZN4mxikQmRSxfff3raBmiZrmo6unM1Lm854j4SR/rm7FcNmnf8/IwO YNvQ== X-Forwarded-Encrypted: i=1; AJvYcCU981pHezot9KGLW364YKg0IDIZBX8wM4FOk4xxacx66t5dLZuzP+511N1x+6SjP1dX6ARoQZAk6/8BCsA=@vger.kernel.org X-Gm-Message-State: AOJu0YzCQdsG12zt92krJ7S/TkMZDBcSmROGzLCf5L+va/9ZV3G+ZE53 W4XoiNKCIh8p2+u4aT+ny/vP0WzqTSbUAVZBkmNq5RTFwfYcIH/qUC3z4DT1NjGCS9JtmBfqy2H MzkP+QzbjjqqgYqrWnA== X-Google-Smtp-Source: AGHT+IEzRRTpq9BGThjAtTMnpcfpVggLzq2Mj7jsx/mhuvVJKFcSB7Gz6JGQE1qtaMHhWCec0Q9TXeSZjyRruCGb X-Received: from wmqb15.prod.google.com ([2002:a05:600c:4e0f:b0:43c:faa1:bb58]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:524c:b0:43d:b32:40aa with SMTP id 5b1f17b1804b1-43d0b32419amr49874555e9.3.1741866049761; Thu, 13 Mar 2025 04:40:49 -0700 (PDT) Date: Thu, 13 Mar 2025 11:40:36 +0000 In-Reply-To: <20250313114038.1502357-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250313114038.1502357-1-vdonnefort@google.com> X-Mailer: git-send-email 2.49.0.rc0.332.g42c0ae87b1-goog Message-ID: <20250313114038.1502357-2-vdonnefort@google.com> Subject: [PATCH v4 1/3] KVM: arm64: Add flags to kvm_hyp_memcache From: Vincent Donnefort To: maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org Cc: qperret@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kernel-team@android.com, Vincent Donnefort Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add flags to kvm_hyp_memcache and propagate the latter to the allocation and free callbacks. This will later allow to account for memory, based on the memcache configuration. Signed-off-by: Vincent Donnefort diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm= _host.h index 3a7ec98ef123..12691ae23d4c 100644 Acked-by: Marc Zyngier --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -86,6 +86,7 @@ struct kvm_hyp_memcache { phys_addr_t head; unsigned long nr_pages; struct pkvm_mapping *mapping; /* only used from EL1 */ + unsigned long flags; }; =20 static inline void push_hyp_memcache(struct kvm_hyp_memcache *mc, diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 1f55b0c7b11d..6107a3c8ccf6 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1086,12 +1086,12 @@ void kvm_free_stage2_pgd(struct kvm_s2_mmu *mmu) } } =20 -static void hyp_mc_free_fn(void *addr, void *unused) +static void hyp_mc_free_fn(void *addr, void *mc) { free_page((unsigned long)addr); } =20 -static void *hyp_mc_alloc_fn(void *unused) +static void *hyp_mc_alloc_fn(void *mc) { return (void *)__get_free_page(GFP_KERNEL_ACCOUNT); } @@ -1102,7 +1102,7 @@ void free_hyp_memcache(struct kvm_hyp_memcache *mc) return; =20 kfree(mc->mapping); - __free_hyp_memcache(mc, hyp_mc_free_fn, kvm_host_va, NULL); + __free_hyp_memcache(mc, hyp_mc_free_fn, kvm_host_va, mc); } =20 int topup_hyp_memcache(struct kvm_hyp_memcache *mc, unsigned long min_page= s) @@ -1117,7 +1117,7 @@ int topup_hyp_memcache(struct kvm_hyp_memcache *mc, u= nsigned long min_pages) } =20 return __topup_hyp_memcache(mc, min_pages, hyp_mc_alloc_fn, - kvm_host_pa, NULL); + kvm_host_pa, mc); } =20 /** --=20 2.49.0.rc0.332.g42c0ae87b1-goog From nobody Thu Dec 18 07:15:12 2025 Received: from mail-wm1-f74.google.com (mail-wm1-f74.google.com [209.85.128.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 954061EF09A for ; Thu, 13 Mar 2025 11:40:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.74 ARC-Seal: i=1; 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Thu, 13 Mar 2025 04:40:52 -0700 (PDT) Date: Thu, 13 Mar 2025 11:40:37 +0000 In-Reply-To: <20250313114038.1502357-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250313114038.1502357-1-vdonnefort@google.com> X-Mailer: git-send-email 2.49.0.rc0.332.g42c0ae87b1-goog Message-ID: <20250313114038.1502357-3-vdonnefort@google.com> Subject: [PATCH v4 2/3] KVM: arm64: Distinct pKVM teardown memcache for stage-2 From: Vincent Donnefort To: maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org Cc: qperret@google.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, kernel-team@android.com, Vincent Donnefort Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In order to account for memory dedicated to the stage-2 page-tables, use a separated memcache when tearing down the VM. Meanwhile rename reclaim_guest_pages to reflect the fact it only reclaim page-table pages. Signed-off-by: Vincent Donnefort diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm= _host.h index 12691ae23d4c..ace3969e8106 100644 Acked-by: Marc Zyngier --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -246,6 +246,7 @@ typedef unsigned int pkvm_handle_t; struct kvm_protected_vm { pkvm_handle_t handle; struct kvm_hyp_memcache teardown_mc; + struct kvm_hyp_memcache stage2_teardown_mc; bool enabled; }; =20 diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm= /hyp/include/nvhe/mem_protect.h index 978f38c386ee..ea0a704da9b8 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -56,7 +56,7 @@ void handle_host_mem_abort(struct kvm_cpu_context *host_c= txt); =20 int hyp_pin_shared_mem(void *from, void *to); void hyp_unpin_shared_mem(void *from, void *to); -void reclaim_guest_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache *= mc); +void reclaim_pgtable_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache= *mc); int refill_memcache(struct kvm_hyp_memcache *mc, unsigned long min_pages, struct kvm_hyp_memcache *host_mc); =20 diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvh= e/mem_protect.c index 19c3c631708c..f34f11c720d7 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -266,7 +266,7 @@ int kvm_guest_prepare_stage2(struct pkvm_hyp_vm *vm, vo= id *pgd) return 0; } =20 -void reclaim_guest_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache *= mc) +void reclaim_pgtable_pages(struct pkvm_hyp_vm *vm, struct kvm_hyp_memcache= *mc) { struct hyp_page *page; void *addr; diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c index 3927fe52a3dd..ac85bc51b8d3 100644 --- a/arch/arm64/kvm/hyp/nvhe/pkvm.c +++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c @@ -678,7 +678,7 @@ teardown_donated_memory(struct kvm_hyp_memcache *mc, vo= id *addr, size_t size) =20 int __pkvm_teardown_vm(pkvm_handle_t handle) { - struct kvm_hyp_memcache *mc; + struct kvm_hyp_memcache *mc, *stage2_mc; struct pkvm_hyp_vm *hyp_vm; struct kvm *host_kvm; unsigned int idx; @@ -706,10 +706,10 @@ int __pkvm_teardown_vm(pkvm_handle_t handle) =20 /* Reclaim guest pages (including page-table pages) */ mc =3D &host_kvm->arch.pkvm.teardown_mc; - reclaim_guest_pages(hyp_vm, mc); + stage2_mc =3D &host_kvm->arch.pkvm.stage2_teardown_mc; + reclaim_pgtable_pages(hyp_vm, stage2_mc); unpin_host_vcpus(hyp_vm->vcpus, hyp_vm->nr_vcpus); =20 - /* Push the metadata pages to the teardown memcache */ for (idx =3D 0; idx < hyp_vm->nr_vcpus; ++idx) { struct pkvm_hyp_vcpu *hyp_vcpu =3D hyp_vm->vcpus[idx]; struct kvm_hyp_memcache *vcpu_mc =3D &hyp_vcpu->vcpu.arch.pkvm_memcache; @@ -717,7 +717,7 @@ int __pkvm_teardown_vm(pkvm_handle_t handle) while (vcpu_mc->nr_pages) { void *addr =3D pop_hyp_memcache(vcpu_mc, hyp_phys_to_virt); =20 - push_hyp_memcache(mc, addr, hyp_virt_to_phys); + push_hyp_memcache(stage2_mc, addr, hyp_virt_to_phys); unmap_donated_memory_noclear(addr, PAGE_SIZE); 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charset="utf-8" Count the pages used by pKVM for the guest stage-2 in memory stats under secondary pagetable, similarly to what the VHE mode does. Signed-off-by: Vincent Donnefort diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm= _host.h index ace3969e8106..51754a354b7a 100644 Acked-by: Marc Zyngier --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -86,6 +86,8 @@ struct kvm_hyp_memcache { phys_addr_t head; unsigned long nr_pages; struct pkvm_mapping *mapping; /* only used from EL1 */ + +#define HYP_MEMCACHE_ACCOUNT_STAGE2 BIT(1) unsigned long flags; }; =20 diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 6107a3c8ccf6..2feb6c6b63af 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1088,12 +1088,24 @@ void kvm_free_stage2_pgd(struct kvm_s2_mmu *mmu) =20 static void hyp_mc_free_fn(void *addr, void *mc) { + struct kvm_hyp_memcache *memcache =3D mc; + + if (memcache->flags & HYP_MEMCACHE_ACCOUNT_STAGE2) + kvm_account_pgtable_pages(addr, -1); + free_page((unsigned long)addr); } =20 static void *hyp_mc_alloc_fn(void *mc) { - return (void *)__get_free_page(GFP_KERNEL_ACCOUNT); + struct kvm_hyp_memcache *memcache =3D mc; + void *addr; + + addr =3D (void *)__get_free_page(GFP_KERNEL_ACCOUNT); + if (addr && memcache->flags & HYP_MEMCACHE_ACCOUNT_STAGE2) + kvm_account_pgtable_pages(addr, 1); + + return addr; } =20 void free_hyp_memcache(struct kvm_hyp_memcache *mc) diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index 19921ca407c6..4409a10d02b6 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -165,12 +165,16 @@ static int __pkvm_create_hyp_vm(struct kvm *host_kvm) handle =3D ret; =20 host_kvm->arch.pkvm.handle =3D handle; + host_kvm->arch.pkvm.stage2_teardown_mc.flags |=3D HYP_MEMCACHE_ACCOUNT_ST= AGE2; + kvm_account_pgtable_pages(pgd, pgd_sz / PAGE_SIZE); =20 /* Donate memory for the vcpus at hyp and initialize it. */ hyp_vcpu_sz =3D PAGE_ALIGN(PKVM_HYP_VCPU_SIZE); kvm_for_each_vcpu(idx, host_vcpu, host_kvm) { void *hyp_vcpu; =20 + host_vcpu->arch.pkvm_memcache.flags |=3D HYP_MEMCACHE_ACCOUNT_STAGE2; + /* Indexing of the vcpus to be sequential starting at 0. */ if (WARN_ON(host_vcpu->vcpu_idx !=3D idx)) { ret =3D -EINVAL; --=20 2.49.0.rc0.332.g42c0ae87b1-goog