From nobody Tue Feb 10 01:19:37 2026 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 3BE072288EA for ; Mon, 7 Apr 2025 08:27:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744014458; cv=none; b=hARgnX848waa3ToLIJoVVJ+Us5GGpa+DQf47FJwL8mESnyv5q1SaBzC2+FIAIVlR2RCH+oVFgxqy/8E3NMGn2Xzz6/ys7uQ0zOkmSNnzg+l/1SPnl1H2QUeMWda7JC6xmJLYcc1PlJCGeoStZSaxeYiYgMl9uPI+eSv+qbJ+kb4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744014458; c=relaxed/simple; bh=z9y0JvWnvG1kJ8p0FisHSHc8Cv5tzDVY6Rw1WnudYvM=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=F41G5v47Rj5uMYOff5ODdufLz18iLKXZMXf6cWLM8/s+F4ztYv7T//Noc8ZZxy/CCtVjo2yU5kco7SfKDXmO8Vbsa/+pfCLhRxUHrsdfIFqEE+s0CSQZK0ynYhuMhg87dxbnqc8fhvEp0TU0Mu45Wpd98PRkLDWuwsw/hlBsOuo= 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=q17jOsML; arc=none smtp.client-ip=209.85.128.74 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--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="q17jOsML" Received: by mail-wm1-f74.google.com with SMTP id 5b1f17b1804b1-43cfda30a3cso24362235e9.3 for ; Mon, 07 Apr 2025 01:27:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1744014454; x=1744619254; 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=FdIqQbEGrH6LJCk5IMP3fGkEsrPpiEvGrmtBvupTZLs=; b=q17jOsMLuALLfZq4i8dzAYg8WxaDfi2KSK0eB0qulbtaF8h3a4+M4/EDCp48GucKVX q/46PgGiA5JMDh7oyV704K1G9+p05EY9iUExmKM5CHrGFRldm5d4kSmzvv5c8WTlz1s3 FIcKzZK5eOuGYZ+xehPnr3RUgDkreN136ed9IkACCaP7Ucj1fTLsYZLY1H88KT/JKovt QVxV5VKy2lgXDdOMb/KBtm5L3ARynDRnTABYqWklH4QeLm3d8mNVZMHBsd+j/uKZHHFy /xeJ9SsGfVIeCC10H5TCDjAHzekDgEtUHf0+3tntTR53ebChjDBHvbavlQqnibk8SVy3 NAWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744014454; x=1744619254; 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=FdIqQbEGrH6LJCk5IMP3fGkEsrPpiEvGrmtBvupTZLs=; b=HkNML+4uAcYV8+8J11XJnsAMAGdPBh5VsHs+ixNGGMSR+VWZ1npaT5n3HamlvzOzpr iu4rdLJHQ7Mq4Kene/9tL0TLxThM1qK6P4txTUt/EYTWiPcf0nMmpNyi0sD50HUQqZEX sNn+BeRFsB/23Qtb6fqUVkq+8hh8Yxv8UEU51jAVVI/oQs873HsAtLRD5Uv3bfjcfpnP I49GfYUtQNqBMenZ2ebqKc6qLgc+i2KYVyeSwL/44cZ3jO7BwhEq3bc/DuOXVhCm/raF zLvD0IdehAj4Vocu2wUxJW2fFr66s/fdoDfsPMRmy8aEKo3Ac4pg4gqfVgW+26BWK8l3 j4FA== X-Forwarded-Encrypted: i=1; AJvYcCWavVs1glxG6Xo728BCggqKsSIqAQkt479h6Ldp/nUh7JyEcG9Wyre0PndzquXNruSGsZpOm2q2DyfKVx8=@vger.kernel.org X-Gm-Message-State: AOJu0YyUqYmrg2danVnV4aTOVnVqwmBZwLtkuuPldFC/1TyKLIdJrCVY oiAoYu3mMc6/3ex4kwqev9EMlzz2Ognav2MGi/u/ZnAZgts7BW8yAJaq9wMAPSG1DuNGnfIVhAG hvjGzRbtgJ5M7JMpY7A== X-Google-Smtp-Source: AGHT+IHsGgikQanBubWw9n3TBOvtvQ0/2An9oSz0STzP+avD7elmsw808grIhtyKdtPWcqWYMd99e7w8hY/KmQYG X-Received: from wmcq3.prod.google.com ([2002:a05:600c:c103:b0:43d:41a2:b768]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:1e23:b0:43d:8ea:8d80 with SMTP id 5b1f17b1804b1-43ecf81b197mr105228475e9.5.1744014454734; Mon, 07 Apr 2025 01:27:34 -0700 (PDT) Date: Mon, 7 Apr 2025 09:26:59 +0100 In-Reply-To: <20250407082706.1239603-1-vdonnefort@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250407082706.1239603-1-vdonnefort@google.com> X-Mailer: git-send-email 2.49.0.504.g3bcea36a83-goog Message-ID: <20250407082706.1239603-3-vdonnefort@google.com> Subject: [PATCH v3 2/9] KVM: arm64: Add a range to __pkvm_host_share_guest() 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 preparation for supporting stage-2 huge mappings for np-guest. Add a nr_pages argument to the __pkvm_host_share_guest hypercall. This range supports only two values: 1 or PMD_SIZE / PAGE_SIZE (that is 512 on a 4K-pages system). Signed-off-by: Vincent Donnefort diff --git a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h b/arch/arm64/kvm= /hyp/include/nvhe/mem_protect.h index ea0a704da9b8..96f673f42e8e 100644 --- a/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h +++ b/arch/arm64/kvm/hyp/include/nvhe/mem_protect.h @@ -39,7 +39,7 @@ int __pkvm_host_donate_hyp(u64 pfn, u64 nr_pages); int __pkvm_hyp_donate_host(u64 pfn, u64 nr_pages); int __pkvm_host_share_ffa(u64 pfn, u64 nr_pages); int __pkvm_host_unshare_ffa(u64 pfn, u64 nr_pages); -int __pkvm_host_share_guest(u64 pfn, u64 gfn, struct pkvm_hyp_vcpu *vcpu, +int __pkvm_host_share_guest(u64 pfn, u64 gfn, u64 nr_pages, struct pkvm_hy= p_vcpu *vcpu, enum kvm_pgtable_prot prot); int __pkvm_host_unshare_guest(u64 gfn, struct pkvm_hyp_vm *hyp_vm); int __pkvm_host_relax_perms_guest(u64 gfn, struct pkvm_hyp_vcpu *vcpu, enu= m kvm_pgtable_prot prot); diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/h= yp-main.c index 2c37680d954c..e71601746935 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c @@ -249,7 +249,8 @@ static void handle___pkvm_host_share_guest(struct kvm_c= pu_context *host_ctxt) { DECLARE_REG(u64, pfn, host_ctxt, 1); DECLARE_REG(u64, gfn, host_ctxt, 2); - DECLARE_REG(enum kvm_pgtable_prot, prot, host_ctxt, 3); + DECLARE_REG(u64, nr_pages, host_ctxt, 3); + DECLARE_REG(enum kvm_pgtable_prot, prot, host_ctxt, 4); struct pkvm_hyp_vcpu *hyp_vcpu; int ret =3D -EINVAL; =20 @@ -264,7 +265,7 @@ static void handle___pkvm_host_share_guest(struct kvm_c= pu_context *host_ctxt) if (ret) goto out; =20 - ret =3D __pkvm_host_share_guest(pfn, gfn, hyp_vcpu, prot); + ret =3D __pkvm_host_share_guest(pfn, gfn, nr_pages, hyp_vcpu, prot); out: cpu_reg(host_ctxt, 1) =3D ret; } diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvh= e/mem_protect.c index 6a90e7687f1f..48bc0370515f 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -60,6 +60,9 @@ static void hyp_unlock_component(void) hyp_spin_unlock(&pkvm_pgd_lock); } =20 +#define for_each_hyp_page(start, size, page) \ + for (page =3D hyp_phys_to_page(start); page < hyp_phys_to_page((start) + = (size)); page++) + static void *host_s2_zalloc_pages_exact(size_t size) { void *addr =3D hyp_alloc_pages(&host_s2_pool, get_order(size)); @@ -507,10 +510,10 @@ int host_stage2_idmap_locked(phys_addr_t addr, u64 si= ze, =20 static void __host_update_page_state(phys_addr_t addr, u64 size, enum pkvm= _page_state state) { - phys_addr_t end =3D addr + size; + struct hyp_page *page; =20 - for (; addr < end; addr +=3D PAGE_SIZE) - hyp_phys_to_page(addr)->host_state =3D state; + for_each_hyp_page(addr, size, page) + page->host_state =3D state; } =20 int host_stage2_set_owner_locked(phys_addr_t addr, u64 size, u8 owner_id) @@ -625,16 +628,16 @@ static int check_page_state_range(struct kvm_pgtable = *pgt, u64 addr, u64 size, static int __host_check_page_state_range(u64 addr, u64 size, enum pkvm_page_state state) { - u64 end =3D addr + size; + struct hyp_page *page; int ret; =20 - ret =3D check_range_allowed_memory(addr, end); + ret =3D check_range_allowed_memory(addr, addr + size); if (ret) return ret; =20 hyp_assert_lock_held(&host_mmu.lock); - for (; addr < end; addr +=3D PAGE_SIZE) { - if (hyp_phys_to_page(addr)->host_state !=3D state) + for_each_hyp_page(addr, size, page) { + if (page->host_state !=3D state) return -EPERM; } =20 @@ -684,10 +687,9 @@ static enum pkvm_page_state guest_get_page_state(kvm_p= te_t pte, u64 addr) return pkvm_getstate(kvm_pgtable_stage2_pte_prot(pte)); } =20 -static int __guest_check_page_state_range(struct pkvm_hyp_vcpu *vcpu, u64 = addr, +static int __guest_check_page_state_range(struct pkvm_hyp_vm *vm, u64 addr, u64 size, enum pkvm_page_state state) { - struct pkvm_hyp_vm *vm =3D pkvm_hyp_vcpu_to_hyp_vm(vcpu); struct check_walk_data d =3D { .desired =3D state, .get_page_state =3D guest_get_page_state, @@ -894,49 +896,81 @@ int __pkvm_host_unshare_ffa(u64 pfn, u64 nr_pages) return ret; } =20 -int __pkvm_host_share_guest(u64 pfn, u64 gfn, struct pkvm_hyp_vcpu *vcpu, +static int __guest_check_transition_size(u64 phys, u64 ipa, u64 nr_pages, = u64 *size) +{ + if (nr_pages =3D=3D 1) { + *size =3D PAGE_SIZE; + return 0; + } + + /* We solely support PMD_SIZE huge-pages */ + if (nr_pages !=3D (1 << (PMD_SHIFT - PAGE_SHIFT))) + return -EINVAL; + + if (!IS_ALIGNED(phys | ipa, PMD_SIZE)) + return -EINVAL; + + *size =3D PMD_SIZE; + return 0; +} + +int __pkvm_host_share_guest(u64 pfn, u64 gfn, u64 nr_pages, struct pkvm_hy= p_vcpu *vcpu, enum kvm_pgtable_prot prot) { struct pkvm_hyp_vm *vm =3D pkvm_hyp_vcpu_to_hyp_vm(vcpu); u64 phys =3D hyp_pfn_to_phys(pfn); u64 ipa =3D hyp_pfn_to_phys(gfn); struct hyp_page *page; + u64 size; int ret; =20 if (prot & ~KVM_PGTABLE_PROT_RWX) return -EINVAL; =20 - ret =3D check_range_allowed_memory(phys, phys + PAGE_SIZE); + ret =3D __guest_check_transition_size(phys, ipa, nr_pages, &size); + if (ret) + return ret; + + ret =3D check_range_allowed_memory(phys, phys + size); if (ret) return ret; =20 host_lock_component(); guest_lock_component(vm); =20 - ret =3D __guest_check_page_state_range(vcpu, ipa, PAGE_SIZE, PKVM_NOPAGE); + ret =3D __guest_check_page_state_range(vm, ipa, size, PKVM_NOPAGE); if (ret) goto unlock; =20 - page =3D hyp_phys_to_page(phys); - switch (page->host_state) { - case PKVM_PAGE_OWNED: - WARN_ON(__host_set_page_state_range(phys, PAGE_SIZE, PKVM_PAGE_SHARED_OW= NED)); - break; - case PKVM_PAGE_SHARED_OWNED: - if (page->host_share_guest_count) - break; - /* Only host to np-guest multi-sharing is tolerated */ - WARN_ON(1); - fallthrough; - default: - ret =3D -EPERM; - goto unlock; + for_each_hyp_page(phys, size, page) { + switch (page->host_state) { + case PKVM_PAGE_OWNED: + continue; + case PKVM_PAGE_SHARED_OWNED: + if (page->host_share_guest_count =3D=3D U32_MAX) { + ret =3D -EBUSY; + goto unlock; + } + + /* Only host to np-guest multi-sharing is tolerated */ + if (page->host_share_guest_count) + continue; + + fallthrough; + default: + ret =3D -EPERM; + goto unlock; + } + } + + for_each_hyp_page(phys, size, page) { + page->host_state =3D PKVM_PAGE_SHARED_OWNED; + page->host_share_guest_count++; } =20 - WARN_ON(kvm_pgtable_stage2_map(&vm->pgt, ipa, PAGE_SIZE, phys, + WARN_ON(kvm_pgtable_stage2_map(&vm->pgt, ipa, size, phys, pkvm_mkstate(prot, PKVM_PAGE_SHARED_BORROWED), &vcpu->vcpu.arch.pkvm_memcache, 0)); - page->host_share_guest_count++; =20 unlock: guest_unlock_component(vm); diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c index 0f89157d31fd..cad25357858f 100644 --- a/arch/arm64/kvm/pkvm.c +++ b/arch/arm64/kvm/pkvm.c @@ -364,7 +364,7 @@ int pkvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u6= 4 addr, u64 size, return -EINVAL; =20 lockdep_assert_held_write(&kvm->mmu_lock); - ret =3D kvm_call_hyp_nvhe(__pkvm_host_share_guest, pfn, gfn, prot); + ret =3D kvm_call_hyp_nvhe(__pkvm_host_share_guest, pfn, gfn, 1, prot); if (ret) { /* Is the gfn already mapped due to a racing vCPU? */ if (ret =3D=3D -EPERM) --=20 2.49.0.504.g3bcea36a83-goog