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KVM: guest_memfd: Move gmem function declarations to dedicated guest_memfd.h

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Extract the gmem function declarations out of kvm_mm.h and into a dedicated
header, guest_memfd.h.  This will allow creating a MAINTAINERS entry for
guest_memfd without having to rely on content pattern matching.

Reviewed-by: Ackerley Tng <ackerleytng@google.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Link: https://patch.msgid.link/20260731173842.2649391-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-07-31 10:38:39 -07:00
parent 4c6547282f
commit f8479adb28
4 changed files with 36 additions and 27 deletions
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1
virt/kvm/guest_memfd.c
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@ -9,6 +9,7 @@
#include <linux/pagemap.h>
#include "kvm_mm.h"
#include "guest_memfd.h"
static struct vfsmount *kvm_gmem_mnt;

34
virt/kvm/guest_memfd.h Normal file
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@ -0,0 +1,34 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __KVM_GUEST_MEMFD_H__
#define __KVM_GUEST_MEMFD_H__
#include <linux/kvm_types.h>
#ifdef CONFIG_KVM_GUEST_MEMFD
int kvm_gmem_init(struct module *module);
void kvm_gmem_exit(void);
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, uoff_t offset);
void kvm_gmem_unbind(struct kvm_memory_slot *slot);
#else
static inline int kvm_gmem_init(struct module *module)
{
return 0;
}
static inline void kvm_gmem_exit(void) {};
static inline int kvm_gmem_bind(struct kvm *kvm,
struct kvm_memory_slot *slot,
unsigned int fd, uoff_t offset)
{
WARN_ON_ONCE(1);
return -EIO;
}
static inline void kvm_gmem_unbind(struct kvm_memory_slot *slot)
{
WARN_ON_ONCE(1);
}
#endif /* CONFIG_KVM_GUEST_MEMFD */
#endif /* __KVM_GUEST_MEMFD_H__ */

1
virt/kvm/kvm_main.c
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@ -56,6 +56,7 @@
#include "coalesced_mmio.h"
#include "async_pf.h"
#include "guest_memfd.h"
#include "kvm_mm.h"
#include "vfio.h"

27
virt/kvm/kvm_mm.h
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@ -70,31 +70,4 @@ static inline void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
}
#endif /* HAVE_KVM_PFNCACHE */
#ifdef CONFIG_KVM_GUEST_MEMFD
int kvm_gmem_init(struct module *module);
void kvm_gmem_exit(void);
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, uoff_t offset);
void kvm_gmem_unbind(struct kvm_memory_slot *slot);
#else
static inline int kvm_gmem_init(struct module *module)
{
return 0;
}
static inline void kvm_gmem_exit(void) {};
static inline int kvm_gmem_bind(struct kvm *kvm,
struct kvm_memory_slot *slot,
unsigned int fd, uoff_t offset)
{
WARN_ON_ONCE(1);
return -EIO;
}
static inline void kvm_gmem_unbind(struct kvm_memory_slot *slot)
{
WARN_ON_ONCE(1);
}
#endif /* CONFIG_KVM_GUEST_MEMFD */
#endif /* __KVM_MM_H__ */