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Mon, 3 Mar 2025 13:30:29 +0000 Received: from EX19MTAUWA001.ant.amazon.com (10.250.64.204) by EX19D003UWB004.ant.amazon.com (10.13.138.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1544.14; Mon, 3 Mar 2025 13:30:29 +0000 Received: from email-imr-corp-prod-pdx-all-2c-c4413280.us-west-2.amazon.com (10.25.36.214) by mail-relay.amazon.com (10.250.64.204) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1544.14 via Frontend Transport; Mon, 3 Mar 2025 13:30:29 +0000 Received: from dev-dsk-kalyazin-1a-a12e27e2.eu-west-1.amazon.com (dev-dsk-kalyazin-1a-a12e27e2.eu-west-1.amazon.com [172.19.103.116]) by email-imr-corp-prod-pdx-all-2c-c4413280.us-west-2.amazon.com (Postfix) with ESMTPS id C461CA039C; Mon, 3 Mar 2025 13:30:26 +0000 (UTC) From: Nikita Kalyazin To: , , CC: , , , , , , , , , , , , , , , , Subject: [RFC PATCH 1/5] KVM: guest_memfd: add kvm_gmem_vma_is_gmem Date: Mon, 3 Mar 2025 13:30:07 +0000 Message-ID: <20250303133011.44095-2-kalyazin@amazon.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250303133011.44095-1-kalyazin@amazon.com> References: <20250303133011.44095-1-kalyazin@amazon.com> MIME-Version: 1.0 X-Stat-Signature: gde5jjc4b4xjtk4unu5d1s9bareuagjq X-Rspamd-Queue-Id: 76BEDA0020 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1741008639-924089 X-HE-Meta: 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 8iDPxdrn 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: It will be used to distinguish the vma type in userfaultfd code. This likely needs to be done in the guestmem library. Signed-off-by: Nikita Kalyazin --- virt/kvm/guest_memfd.c | 5 +++++ virt/kvm/kvm_mm.h | 1 + 2 files changed, 6 insertions(+) diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index f93fe5835173..af825f7494ea 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -500,6 +500,11 @@ static ssize_t kvm_kmem_gmem_write(struct file *file, const char __user *buf, return ret && start == (*offset >> PAGE_SHIFT) ? ret : *offset - (start << PAGE_SHIFT); } + +bool kvm_gmem_vma_is_gmem(struct vm_area_struct *vma) +{ + return vma->vm_ops == &kvm_gmem_vm_ops; +} #endif /* CONFIG_KVM_GMEM_SHARED_MEM */ static struct file_operations kvm_gmem_fops = { diff --git a/virt/kvm/kvm_mm.h b/virt/kvm/kvm_mm.h index acef3f5c582a..09fcdf18a072 100644 --- a/virt/kvm/kvm_mm.h +++ b/virt/kvm/kvm_mm.h @@ -73,6 +73,7 @@ int kvm_gmem_create(struct kvm *kvm, struct kvm_create_guest_memfd *args); int kvm_gmem_bind(struct kvm *kvm, struct kvm_memory_slot *slot, unsigned int fd, loff_t offset); void kvm_gmem_unbind(struct kvm_memory_slot *slot); +bool kvm_gmem_vma_is_gmem(struct vm_area_struct *vma); #else static inline void kvm_gmem_init(struct module *module) {