From nobody Sat Oct 4 08:13:28 2025 Received: from mail-wr1-f74.google.com (mail-wr1-f74.google.com [209.85.221.74]) (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 757A935A281 for ; Tue, 19 Aug 2025 21:52:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755640359; cv=none; b=UlPKyEVxTaaqQShq8uFMgcjR/tTH9AqsX/BfSlz67KCC0h/JYUTLqMCjTd04REILOhQoH3qd4q8r0FZT0UYJ5cxhIJKLUcHgA0zh3ZazmcW9X3lFkKVs7bPePYht3wvTjD3BOb3joPapMjv+G1Nm9ZEDSoa+7dBYkUv7JF52ktM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755640359; c=relaxed/simple; bh=vXwQDqElLwmdFXH6atI73BgGkGDD39YTucq302WuvLs=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=YorD5kIaABeJn632BqeHS648kNq1yfvh9Pj0iDZXw0Y4+hfLQ67+VyCfp+ujjF1fXm2y2AvbVrC5kd3noHZqHcnuhQRxHsWyBbn8WVTNAMrXHtFIwbQ46vj4TjYmkHSwji4wxGl/be9FdCR8XF9/VoXRzUuO1TddiaFCRuNk4eQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--smostafa.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=a+E170kc; arc=none smtp.client-ip=209.85.221.74 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--smostafa.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="a+E170kc" Received: by mail-wr1-f74.google.com with SMTP id ffacd0b85a97d-3b9d41b88ffso2609393f8f.0 for ; Tue, 19 Aug 2025 14:52:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1755640355; x=1756245155; 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=bHyXp0c9r8a6Z3kqM6MYogJzQkCF/sRbjU6o05FpAFo=; b=a+E170kcRHESTgF8KYS2+YedhptexBklgcrhhWSp1WX7kEw3ckG0EGARBuPWGIeyAs n6/j1+VMqpZlJgkgnF8cXTjQy2zY38DK02re6qRCB20Hx9HqRs1zDDaV7wHBzwSXVrrC /vND0T2kA1fi5QgxTDo3MXG64TRlAmE2e+hfMQQVgj2E89B3DzC+ISU33nTNQfJjyxRR vAVYI59KlLL8RZVSv0O255VpW5uQSyxMkMCutSTgs8aH5Sf1N/+qU8JUsW863l9AsVv5 qlFqj5QQySHp7T70+KemVNaVkiBd2Oe93G8feba0+PDRHF4hIi9asUMvRTxLxvnwV59e FbCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755640355; x=1756245155; 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=bHyXp0c9r8a6Z3kqM6MYogJzQkCF/sRbjU6o05FpAFo=; b=SI5Avcfh4PQAWkprnSPG6VZPuVBryfThkxkwAJHHzG3RGIY9YWK5QE2vPLlcI8aj2C 5mD5Wa3aCkqBz1XKZ8wVJ6W0FMAUDCkjz/AihivI54UZvCSiK6o7mlMYfiyYlmxfjqt3 vMZuZbnSQcKh+cHz7hrf1SvkpQt7Mdpfce6fqd6k1Qh0jQ4ox+OsGzVd4qgCHVB+qllj UNNTo86W54rN7sryVHP25Lg/jkTnxeAN9x2FsPhk0LQ/4j2MzAXv/Wfah5d3/jf9hLk9 NDEGShQ9N4Z70o1WYwNiXu4uc0cPo1riv1hUU/wbLwZSFxDV5Rn6G9RbDGr/gZFQbReP Zunw== X-Gm-Message-State: AOJu0Yx/R+/GoBMRBpM8+7SiU4KKMfRiyr8kXLPJ447ZSe+I/rpQpKfr qLe8QvpXIJ/MchRLcgqIvJZzg5Cns3QMLCACK9rMDixx5f+IAvfvTXhJiqYdV6pQ3uNlYIaNGBX TjXboDxHHrdAZlXhFoEjvQIJbx8zknFY7kOMFCvV2Z6atWumbCGm113zrKzaL/8tT48N9ct9kL2 JgT6tIQMbYy2+CUvChhaE7gbIl8v3ae4EPeRzPQKHlntzkUoujAryDrkY= X-Google-Smtp-Source: AGHT+IF09z/zChrY/XKW2p3rPVo1I7WRsoRzioqDNTUyJHzYESu4rlz8VOrrsAe/v0WNmek1lpwYcIduC6GS/A== X-Received: from wmth10.prod.google.com ([2002:a05:600c:8b6a:b0:459:e347:8a6e]) (user=smostafa job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6000:4284:b0:3a6:d145:e2cc with SMTP id ffacd0b85a97d-3c32e03e447mr337072f8f.15.1755640354609; Tue, 19 Aug 2025 14:52:34 -0700 (PDT) Date: Tue, 19 Aug 2025 21:51:39 +0000 In-Reply-To: <20250819215156.2494305-1-smostafa@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250819215156.2494305-1-smostafa@google.com> X-Mailer: git-send-email 2.51.0.rc1.167.g924127e9c0-goog Message-ID: <20250819215156.2494305-12-smostafa@google.com> Subject: [PATCH v4 11/28] KVM: arm64: iommu: Add memory pool From: Mostafa Saleh To: linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev Cc: 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, robin.murphy@arm.com, jean-philippe@linaro.org, qperret@google.com, tabba@google.com, jgg@ziepe.ca, mark.rutland@arm.com, praan@google.com, Mostafa Saleh Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" IOMMU drivers would require to allocate memory for the shadow page table. Similar to the host stage-2 CPU page table, the IOMMU pool is allocated early from the carveout and it's memory is added in a pool which the IOMMU driver can allocate from and reclaim at run time. At this point the nr_pages is 0 as there are no driver, in the next patches when the SMMUv3 driver is added, it will add it's own function to return the number of pages needed in kvm/iommu.c. Unfortunately, this part has 2 leak into kvm/iommu as this happens too early before drivers can have any init calls. Signed-off-by: Mostafa Saleh --- arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/hyp/include/nvhe/iommu.h | 5 ++++- arch/arm64/kvm/hyp/nvhe/iommu/iommu.c | 20 +++++++++++++++++++- arch/arm64/kvm/hyp/nvhe/setup.c | 10 +++++++++- arch/arm64/kvm/iommu.c | 11 +++++++++++ arch/arm64/kvm/pkvm.c | 1 + 6 files changed, 45 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm= _host.h index 1a08066eaf7e..fcb4b26072f7 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1676,5 +1676,6 @@ void check_feature_map(void); =20 struct kvm_iommu_ops; int kvm_iommu_register_driver(struct kvm_iommu_ops *hyp_ops); +size_t kvm_iommu_pages(void); =20 #endif /* __ARM64_KVM_HOST_H__ */ diff --git a/arch/arm64/kvm/hyp/include/nvhe/iommu.h b/arch/arm64/kvm/hyp/i= nclude/nvhe/iommu.h index 219363045b1c..9f4906c6dcc9 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/iommu.h +++ b/arch/arm64/kvm/hyp/include/nvhe/iommu.h @@ -10,8 +10,11 @@ struct kvm_iommu_ops { void (*host_stage2_idmap)(phys_addr_t start, phys_addr_t end, int prot); }; =20 -int kvm_iommu_init(void); +int kvm_iommu_init(void *pool_base, size_t nr_pages); =20 void kvm_iommu_host_stage2_idmap(phys_addr_t start, phys_addr_t end, enum kvm_pgtable_prot prot); +void *kvm_iommu_donate_pages(u8 order); +void kvm_iommu_reclaim_pages(void *ptr); + #endif /* __ARM64_KVM_NVHE_IOMMU_H__ */ diff --git a/arch/arm64/kvm/hyp/nvhe/iommu/iommu.c b/arch/arm64/kvm/hyp/nvh= e/iommu/iommu.c index f7d1c8feb358..1673165c7330 100644 --- a/arch/arm64/kvm/hyp/nvhe/iommu/iommu.c +++ b/arch/arm64/kvm/hyp/nvhe/iommu/iommu.c @@ -15,6 +15,7 @@ struct kvm_iommu_ops *kvm_iommu_ops; =20 /* Protected by host_mmu.lock */ static bool kvm_idmap_initialized; +static struct hyp_pool iommu_pages_pool; =20 static inline int pkvm_to_iommu_prot(enum kvm_pgtable_prot prot) { @@ -72,7 +73,7 @@ static int kvm_iommu_snapshot_host_stage2(void) return ret; } =20 -int kvm_iommu_init(void) +int kvm_iommu_init(void *pool_base, size_t nr_pages) { int ret; =20 @@ -80,6 +81,13 @@ int kvm_iommu_init(void) !kvm_iommu_ops->host_stage2_idmap) return -ENODEV; =20 + if (nr_pages) { + ret =3D hyp_pool_init(&iommu_pages_pool, hyp_virt_to_pfn(pool_base), + nr_pages, 0); + if (ret) + return ret; + } + ret =3D kvm_iommu_ops->init(); if (ret) return ret; @@ -95,3 +103,13 @@ void kvm_iommu_host_stage2_idmap(phys_addr_t start, phy= s_addr_t end, return; kvm_iommu_ops->host_stage2_idmap(start, end, pkvm_to_iommu_prot(prot)); } + +void *kvm_iommu_donate_pages(u8 order) +{ + return hyp_alloc_pages(&iommu_pages_pool, order); +} + +void kvm_iommu_reclaim_pages(void *ptr) +{ + hyp_put_page(&iommu_pages_pool, ptr); +} diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setu= p.c index bdbc77395e03..09ecee2cd864 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -21,6 +21,7 @@ #include =20 unsigned long hyp_nr_cpus; +size_t hyp_kvm_iommu_pages; =20 #define hyp_percpu_size ((unsigned long)__per_cpu_end - \ (unsigned long)__per_cpu_start) @@ -33,6 +34,7 @@ static void *selftest_base; static void *ffa_proxy_pages; static struct kvm_pgtable_mm_ops pkvm_pgtable_mm_ops; static struct hyp_pool hpool; +static void *iommu_base; =20 static int divide_memory_pool(void *virt, unsigned long size) { @@ -70,6 +72,12 @@ static int divide_memory_pool(void *virt, unsigned long = size) if (!ffa_proxy_pages) return -ENOMEM; =20 + if (hyp_kvm_iommu_pages) { + iommu_base =3D hyp_early_alloc_contig(hyp_kvm_iommu_pages); + if (!iommu_base) + return -ENOMEM; + } + return 0; } =20 @@ -321,7 +329,7 @@ void __noreturn __pkvm_init_finalise(void) if (ret) goto out; =20 - ret =3D kvm_iommu_init(); + ret =3D kvm_iommu_init(iommu_base, hyp_kvm_iommu_pages); if (ret) goto out; =20 diff --git a/arch/arm64/kvm/iommu.c b/arch/arm64/kvm/iommu.c index 926a1a94698f..5460b1bd44a6 100644 --- a/arch/arm64/kvm/iommu.c +++ b/arch/arm64/kvm/iommu.c @@ -7,9 +7,20 @@ #include =20 extern struct kvm_iommu_ops *kvm_nvhe_sym(kvm_iommu_ops); +extern size_t kvm_nvhe_sym(hyp_kvm_iommu_pages); =20 int kvm_iommu_register_driver(struct kvm_iommu_ops *hyp_ops) { kvm_nvhe_sym(kvm_iommu_ops) =3D hyp_ops; return 0; } + +size_t kvm_iommu_pages(void) +{ + /* + * This is called very early during setup_arch() where no initcalls, + * so this has to call specific functions per each KVM driver. + */ + kvm_nvhe_sym(hyp_kvm_iommu_pages) =3D 0; + return 0; +} diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index fcd70bfe44fb..6098beda36fa 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -63,6 +63,7 @@ void __init kvm_hyp_reserve(void) hyp_mem_pages +=3D hyp_vmemmap_pages(STRUCT_HYP_PAGE_SIZE); hyp_mem_pages +=3D pkvm_selftest_pages(); hyp_mem_pages +=3D hyp_ffa_proxy_pages(); + hyp_mem_pages +=3D kvm_iommu_pages(); =20 /* * Try to allocate a PMD-aligned region to reduce TLB pressure once --=20 2.51.0.rc1.167.g924127e9c0-goog