linux-kernel - [PATCH v2 2/5] KVM: guest_memfd: add kvm_gmem_vma_is

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Message-ID: <20250402160721.97596-3-kalyazin@amazon.com>
Date: Wed, 2 Apr 2025 16:07:18 +0000
From: Nikita Kalyazin <kalyazin@...zon.com>
To: <akpm@...ux-foundation.org>, <pbonzini@...hat.com>, <shuah@...nel.org>
CC: <kvm@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<lorenzo.stoakes@...cle.com>, <david@...hat.com>, <ryan.roberts@....com>,
	<quic_eberman@...cinc.com>, <jthoughton@...gle.com>, <peterx@...hat.com>,
	<graf@...zon.de>, <jgowans@...zon.com>, <roypat@...zon.co.uk>,
	<derekmn@...zon.com>, <nsaenz@...zon.es>, <xmarcalx@...zon.com>,
	<kalyazin@...zon.com>
Subject: [PATCH v2 2/5] KVM: guest_memfd: add kvm_gmem_vma_is_gmem

It will be used to distinguish the vma type in userfaultfd code.

Signed-off-by: Nikita Kalyazin <kalyazin@...zon.com>
---
 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 fbf89e643add..26b1734b9623 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c
@@ -416,6 +416,11 @@ static int kvm_gmem_mmap(struct file *file, struct vm_area_struct *vma)
 
 	return 0;
 }
+
+bool kvm_gmem_vma_is_gmem(struct vm_area_struct *vma)
+{
+	return vma->vm_ops == &kvm_gmem_vm_ops;
+}
 #else
 #define kvm_gmem_mmap NULL
 #endif /* CONFIG_KVM_GMEM_SHARED_MEM */
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)
 {
-- 
2.47.1