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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BL6PEPF0001AB55.mail.protection.outlook.com (10.167.241.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7452.22 via Frontend Transport; Tue, 9 Apr 2024 23:46:47 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 9 Apr 2024 18:46:47 -0500 Date: Tue, 9 Apr 2024 18:35:42 -0500 From: Michael Roth To: Paolo Bonzini CC: , , , Subject: Re: [PATCH 07/11] KVM: guest_memfd: extract __kvm_gmem_get_pfn() Message-ID: <20240409233542.aapmef7mkztgbnv2@amd.com> References: <20240404185034.3184582-1-pbonzini@redhat.com> <20240404185034.3184582-8-pbonzini@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Apr 2024 23:46:47.9889 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: debaadf2-6467-44fa-9acd-08dc58ef5243 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB55.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7753 On Thu, Apr 04, 2024 at 02:50:29PM -0400, Paolo Bonzini wrote: > In preparation for adding a function that walks a set of pages > provided by userspace and populates them in a guest_memfd, > add a version of kvm_gmem_get_pfn() that has a "bool prepare" > argument and passes it down to kvm_gmem_get_folio(). > > Populating guest memory has to call repeatedly __kvm_gmem_get_pfn() > on the same file, so make the new function take struct file*. > > Signed-off-by: Paolo Bonzini > --- > virt/kvm/guest_memfd.c | 38 +++++++++++++++++++++++--------------- > 1 file changed, 23 insertions(+), 15 deletions(-) > > diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c > index 486748e65f36..a537a7e63ab5 100644 > --- a/virt/kvm/guest_memfd.c > +++ b/virt/kvm/guest_memfd.c > @@ -540,33 +540,29 @@ void kvm_gmem_unbind(struct kvm_memory_slot *slot) > fput(file); > } > > -int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot, > - gfn_t gfn, kvm_pfn_t *pfn, int *max_order) > +static int __kvm_gmem_get_pfn(struct file *file, struct kvm_memory_slot *slot, > + gfn_t gfn, kvm_pfn_t *pfn, int *max_order, bool prepare) > { > pgoff_t index = gfn - slot->base_gfn + slot->gmem.pgoff; > - struct kvm_gmem *gmem; > + struct kvm_gmem *gmem = file->private_data; > struct folio *folio; > struct page *page; > - struct file *file; > int r; > > - file = kvm_gmem_get_file(slot); > - if (!file) > + if (file != slot->gmem.file) { > + WARN_ON_ONCE(slot->gmem.file); > return -EFAULT; > + } > > gmem = file->private_data; > - > if (xa_load(&gmem->bindings, index) != slot) { > WARN_ON_ONCE(xa_load(&gmem->bindings, index)); > - r = -EIO; > - goto out_fput; > + return -EIO; > } > > folio = kvm_gmem_get_folio(file_inode(file), index, true); This should be: folio = kvm_gmem_get_folio(file_inode(file), index, prepare); Otherwise: Reviewed-by: Michael Roth -Mike > - if (!folio) { > - r = -ENOMEM; > - goto out_fput; > - } > + if (!folio) > + return -ENOMEM; > > if (folio_test_hwpoison(folio)) { > r = -EHWPOISON; > @@ -583,9 +579,21 @@ int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot, > > out_unlock: > folio_unlock(folio); > -out_fput: > - fput(file); > > return r; > } > + > +int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot, > + gfn_t gfn, kvm_pfn_t *pfn, int *max_order) > +{ > + struct file *file = kvm_gmem_get_file(slot); > + int r; > + > + if (!file) > + return -EFAULT; > + > + r = __kvm_gmem_get_pfn(file, slot, gfn, pfn, max_order, true); > + fput(file); > + return r; > +} > EXPORT_SYMBOL_GPL(kvm_gmem_get_pfn); > -- > 2.43.0 > >