[RFC PATCH 0/5] MAINTAINERS: KVM tweaks and additions

[RFC PATCH 0/5] MAINTAINERS: KVM tweaks and additions

[Sean Christopherson]

A few tangentially related KVM MAINTAINERS updates.  RFC as I haven't run
these ideas by anyone.  Feedback is very much wanted, especially on the
non-x86 changes (everything except patch 1).

Sean Christopherson (5):
  MAINTAINERS: Add kvm-x86 tree to KVM x86 entries
  KVM: guest_memfd: Move gmem function declarations to dedicated
    guest_memfd.h
  MAINTAINERS: Add an entry for KVM's guest_memfd
  MAINTAINERS: Add David H. as a KVM guest_memfd reviewer
  MAINTAINERS: Add myself (Sean) as a reviewer in the main KVM entry

 MAINTAINERS            | 14 ++++++++++++++
 virt/kvm/guest_memfd.c |  1 +
 virt/kvm/guest_memfd.h | 34 ++++++++++++++++++++++++++++++++++
 virt/kvm/kvm_main.c    |  1 +
 virt/kvm/kvm_mm.h      | 27 ---------------------------
 5 files changed, 50 insertions(+), 27 deletions(-)
 create mode 100644 virt/kvm/guest_memfd.h


base-commit: 39f1c201b93f4ff71631bac72cff6eb155f976a4
-- 
2.54.0.545.g6539524ca2-goog

[RFC PATCH 1/5] MAINTAINERS: Add kvm-x86 tree to KVM x86 entries

[Sean Christopherson]

Add the kvm-x86 tree to all KVM x86 entries so that humans, bots, and
everything in between can more easily find KVM x86 (and some broader KVM)
patches that are targeted for the next kernel release, but haven't yet made
their way to the main KVM tree.  While the KVM x86 patch flow is documented
in Documentation/process/maintainer-kvm-x86.rst, that's very much one-off
documentation; random passersbys likely don't know it exists, and it's not
suitable for any workflow that's at all automated.

Reported-by: Yosry Ahmed <yosry@kernel.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 MAINTAINERS | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 2fb1c75afd16..89b470db22de 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14149,6 +14149,7 @@ L:	kvm@vger.kernel.org
 S:	Supported
 P:	Documentation/process/maintainer-kvm-x86.rst
 T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git
+T:	git https://github.com/kvm-x86/linux.git
 F:	arch/x86/include/asm/kvm*
 F:	arch/x86/include/asm/svm.h
 F:	arch/x86/include/asm/vmx*.h
@@ -14419,6 +14420,7 @@ M:	Paolo Bonzini <pbonzini@redhat.com>
 L:	kvm@vger.kernel.org
 S:	Supported
 T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git
+T:	git https://github.com/kvm-x86/linux.git
 F:	arch/x86/kvm/hyperv.*
 F:	arch/x86/kvm/kvm_onhyperv.*
 F:	arch/x86/kvm/svm/hyperv.*
@@ -14433,6 +14435,7 @@ M:	Paolo Bonzini <pbonzini@redhat.com>
 L:	kvm@vger.kernel.org
 S:	Supported
 T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git
+T:	git https://github.com/kvm-x86/linux.git
 F:	arch/x86/kvm/xen.*
 
 L3MDEV
-- 
2.54.0.545.g6539524ca2-goog

[RFC PATCH 2/5] KVM: guest_memfd: Move gmem function declarations to dedicated guest_memfd.h

[Sean Christopherson]

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.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 virt/kvm/guest_memfd.c |  1 +
 virt/kvm/guest_memfd.h | 34 ++++++++++++++++++++++++++++++++++
 virt/kvm/kvm_main.c    |  1 +
 virt/kvm/kvm_mm.h      | 27 ---------------------------
 4 files changed, 36 insertions(+), 27 deletions(-)
 create mode 100644 virt/kvm/guest_memfd.h

diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c
index 69c9d6d546b2..a93a31568337 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c
@@ -9,6 +9,7 @@
 #include <linux/pagemap.h>
 
 #include "kvm_mm.h"
+#include "guest_memfd.h"
 
 static struct vfsmount *kvm_gmem_mnt;
 
diff --git a/virt/kvm/guest_memfd.h b/virt/kvm/guest_memfd.h
new file mode 100644
index 000000000000..e8b825da264b
--- /dev/null
+++ b/virt/kvm/guest_memfd.h
@@ -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, loff_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, loff_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__ */
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 89489996fbc1..a4035ffb421f 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -56,6 +56,7 @@
 
 #include "coalesced_mmio.h"
 #include "async_pf.h"
+#include "guest_memfd.h"
 #include "kvm_mm.h"
 #include "vfio.h"
 
diff --git a/virt/kvm/kvm_mm.h b/virt/kvm/kvm_mm.h
index 9fcc5d5b7f8d..4958c0a93d64 100644
--- a/virt/kvm/kvm_mm.h
+++ b/virt/kvm/kvm_mm.h
@@ -67,31 +67,4 @@ 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, loff_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, loff_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__ */
-- 
2.54.0.545.g6539524ca2-goog

[RFC PATCH 3/5] MAINTAINERS: Add an entry for KVM's guest_memfd

[Sean Christopherson]

To better reflect how guest_memfd has been maintained for the last few
years, and to prepare for significant upcoming growth and expansion, add a
dedicated MAINTAINERS entry for KVM's guest_memfd, with Paolo and myself
(Sean) as co-maintainers.

List both the KVM and KVM x86 git trees as authoritative repositories, as
any given guest_memfd change has a equal odds of hitting KVM x86 or not.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 MAINTAINERS | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 89b470db22de..9eceeb6f699d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14396,6 +14396,15 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
 F:	drivers/video/backlight/ktz8866.c
 
+KVM GUEST_MEMFD
+M:	Sean Christopherson <seanjc@google.com>
+M:	Paolo Bonzini <pbonzini@redhat.com>
+L:	kvm@vger.kernel.org
+S:	Supported
+T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git
+T:	git https://github.com/kvm-x86/linux.git
+F:	virt/kvm/guest_memfd.*
+
 KVM PARAVIRT (KVM/paravirt)
 M:	Paolo Bonzini <pbonzini@redhat.com>
 R:	Vitaly Kuznetsov <vkuznets@redhat.com>
-- 
2.54.0.545.g6539524ca2-goog

[RFC PATCH 4/5] MAINTAINERS: Add David H. as a KVM guest_memfd reviewer

[Sean Christopherson]

Officially "reward" David with guest_memfd responsibilities and authority,
as he's been instrumental in pushing guest_memfd forward, and his ongoing
input and feedback, especially from an mm/ perspective, is and will be
critical to keeping us virtualization folks from going too far off the
rails.

Cc: David Hildenbrand <david@kernel.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 MAINTAINERS | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 9eceeb6f699d..8dd5cdbef66f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14399,6 +14399,7 @@ F:	drivers/video/backlight/ktz8866.c
 KVM GUEST_MEMFD
 M:	Sean Christopherson <seanjc@google.com>
 M:	Paolo Bonzini <pbonzini@redhat.com>
+R:	David Hildenbrand <david@kernel.org>
 L:	kvm@vger.kernel.org
 S:	Supported
 T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git
-- 
2.54.0.545.g6539524ca2-goog

[RFC PATCH 5/5] MAINTAINERS: Add myself (Sean) as a reviewer in the main KVM entry

[Sean Christopherson]

Add myself as a reviewer for overall KVM, as I have been helping shepherd
a decent chunk of the virt/kvm commits into the kernel over the last few
years, and I expect to continue doing so.  Of the 270 non-merge commits
that have been made to virt/kvm since v6.6, I have committed 127 (~47%)
and Paolo has committed 117 (~43.3%), with all but 5 of the remaining 26
coming from non-KVM folks, e.g. from treewide changes.

Note, this intended to purely be an efficiency and quality of life
improvement, for both contributors and myself.  There is no implied right
of succession or anything of the sort.

Cc: Marc Zyngier <maz@kernel.org>
Cc: Oliver Upton <oupton@kernel.org>
Cc: Tianrui Zhao <zhaotianrui@loongson.cn>
Cc: Bibo Mao <maobibo@loongson.cn>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Anup Patel <anup@brainfault.org>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 MAINTAINERS | 1 +
 1 file changed, 1 insertion(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 8dd5cdbef66f..a9f2a7737547 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14034,6 +14034,7 @@ F:	kernel/umh.c
 
 KERNEL VIRTUAL MACHINE (KVM)
 M:	Paolo Bonzini <pbonzini@redhat.com>
+R:	Sean Christopherson <seanjc@google.com>
 L:	kvm@vger.kernel.org
 S:	Supported
 W:	http://www.linux-kvm.org
-- 
2.54.0.545.g6539524ca2-goog

Re: [RFC PATCH 2/5] KVM: guest_memfd: Move gmem function declarations to dedicated guest_memfd.h

[David Hildenbrand (Arm)]

On 4/28/26 19:15, Sean Christopherson wrote:
> 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.
> 
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---

Acked-by: David Hildenbrand (Arm) <david@kernel.org>

-- 
Cheers,

David

Re: [RFC PATCH 3/5] MAINTAINERS: Add an entry for KVM's guest_memfd

[David Hildenbrand (Arm)]

On 4/28/26 19:15, Sean Christopherson wrote:
> To better reflect how guest_memfd has been maintained for the last few
> years, and to prepare for significant upcoming growth and expansion, add a
> dedicated MAINTAINERS entry for KVM's guest_memfd, with Paolo and myself
> (Sean) as co-maintainers.
> 
> List both the KVM and KVM x86 git trees as authoritative repositories, as
> any given guest_memfd change has a equal odds of hitting KVM x86 or not.
> 
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  MAINTAINERS | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 89b470db22de..9eceeb6f699d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14396,6 +14396,15 @@ S:	Maintained
>  F:	Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
>  F:	drivers/video/backlight/ktz8866.c
>  
> +KVM GUEST_MEMFD
> +M:	Sean Christopherson <seanjc@google.com>
> +M:	Paolo Bonzini <pbonzini@redhat.com>
> +L:	kvm@vger.kernel.org
> +S:	Supported
> +T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git
> +T:	git https://github.com/kvm-x86/linux.git
> +F:	virt/kvm/guest_memfd.*
>

LGTM. There is still the open question regarding other hypervisors, and it
having to move out of virt/kvm at some point.

For the time being, this is the right thing to do.

-- 
Cheers,

David

Re: [RFC PATCH 4/5] MAINTAINERS: Add David H. as a KVM guest_memfd reviewer

[David Hildenbrand (Arm)]

On 4/28/26 19:15, Sean Christopherson wrote:
> Officially "reward" David with guest_memfd responsibilities and authority,
> as he's been instrumental in pushing guest_memfd forward, and his ongoing
> input and feedback, especially from an mm/ perspective, is and will be
> critical to keeping us virtualization folks from going too far off the
> rails.

Thanks for the kind words, Sean!

Acked-by: David Hildenbrand (Arm) <david@kernel.org>

> 
> Cc: David Hildenbrand <david@kernel.org>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  MAINTAINERS | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 9eceeb6f699d..8dd5cdbef66f 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14399,6 +14399,7 @@ F:	drivers/video/backlight/ktz8866.c
>  KVM GUEST_MEMFD
>  M:	Sean Christopherson <seanjc@google.com>
>  M:	Paolo Bonzini <pbonzini@redhat.com>
> +R:	David Hildenbrand <david@kernel.org>
>  L:	kvm@vger.kernel.org
>  S:	Supported
>  T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git


-- 
Cheers,

David

Re: [RFC PATCH 5/5] MAINTAINERS: Add myself (Sean) as a reviewer in the main KVM entry

[David Hildenbrand (Arm)]

On 4/28/26 19:15, Sean Christopherson wrote:
> Add myself as a reviewer for overall KVM, as I have been helping shepherd
> a decent chunk of the virt/kvm commits into the kernel over the last few
> years, and I expect to continue doing so.  Of the 270 non-merge commits
> that have been made to virt/kvm since v6.6, I have committed 127 (~47%)
> and Paolo has committed 117 (~43.3%), with all but 5 of the remaining 26
> coming from non-KVM folks, e.g. from treewide changes.
> 
> Note, this intended to purely be an efficiency and quality of life
> improvement, for both contributors and myself.  There is no implied right
> of succession or anything of the sort.
> 
> Cc: Marc Zyngier <maz@kernel.org>
> Cc: Oliver Upton <oupton@kernel.org>
> Cc: Tianrui Zhao <zhaotianrui@loongson.cn>
> Cc: Bibo Mao <maobibo@loongson.cn>
> Cc: Huacai Chen <chenhuacai@kernel.org>
> Cc: Anup Patel <anup@brainfault.org>
> Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
> Cc: Janosch Frank <frankja@linux.ibm.com>
> Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  MAINTAINERS | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8dd5cdbef66f..a9f2a7737547 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14034,6 +14034,7 @@ F:	kernel/umh.c
>  
>  KERNEL VIRTUAL MACHINE (KVM)
>  M:	Paolo Bonzini <pbonzini@redhat.com>
> +R:	Sean Christopherson <seanjc@google.com>
>  L:	kvm@vger.kernel.org
>  S:	Supported
>  W:	http://www.linux-kvm.org

I believe any bigger subsystem should have a backup in place. If that's spelled
out through an M or R depends on the subsystem.

Certainly LGTM, but if you would have made that an M, I would also not have been
struck by surprise (up to you and Paolo to figure out) :)

-- 
Cheers,

David

Re: [RFC PATCH 2/5] KVM: guest_memfd: Move gmem function declarations to dedicated guest_memfd.h

[Ackerley Tng]

Sean Christopherson <seanjc@google.com> writes:

> 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.
>

This also trims kvm_mm.h, which makes it easier to look stuff
up. Thanks!

Shall we do something similar for include/linux/kvm_host.h?

Reviewed-by: Ackerley Tng <ackerleytng@google.com>

> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  virt/kvm/guest_memfd.c |  1 +
>  virt/kvm/guest_memfd.h | 34 ++++++++++++++++++++++++++++++++++
>  virt/kvm/kvm_main.c    |  1 +
>  virt/kvm/kvm_mm.h      | 27 ---------------------------
>  4 files changed, 36 insertions(+), 27 deletions(-)
>  create mode 100644 virt/kvm/guest_memfd.h
>
>
> [...snip...]
>

Re: [RFC PATCH 3/5] MAINTAINERS: Add an entry for KVM's guest_memfd

[Ackerley Tng]

Sean Christopherson <seanjc@google.com> writes:

> To better reflect how guest_memfd has been maintained for the last few
> years, and to prepare for significant upcoming growth and expansion, add a
> dedicated MAINTAINERS entry for KVM's guest_memfd, with Paolo and myself
> (Sean) as co-maintainers.
>
> List both the KVM and KVM x86 git trees as authoritative repositories, as
> any given guest_memfd change has a equal odds of hitting KVM x86 or not.
>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  MAINTAINERS | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 89b470db22de..9eceeb6f699d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14396,6 +14396,15 @@ S:	Maintained
>  F:	Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
>  F:	drivers/video/backlight/ktz8866.c
>
> +KVM GUEST_MEMFD
> +M:	Sean Christopherson <seanjc@google.com>
> +M:	Paolo Bonzini <pbonzini@redhat.com>
> +L:	kvm@vger.kernel.org
> +S:	Supported
> +T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git
> +T:	git https://github.com/kvm-x86/linux.git
> +F:	virt/kvm/guest_memfd.*

Should selftests for guest_memfd be added here too?

> +
>  KVM PARAVIRT (KVM/paravirt)
>  M:	Paolo Bonzini <pbonzini@redhat.com>
>  R:	Vitaly Kuznetsov <vkuznets@redhat.com>
> --
> 2.54.0.545.g6539524ca2-goog

Re: [RFC PATCH 4/5] MAINTAINERS: Add David H. as a KVM guest_memfd reviewer

[Ackerley Tng]

"David Hildenbrand (Arm)" <david@kernel.org> writes:

> On 4/28/26 19:15, Sean Christopherson wrote:
>> Officially "reward" David with guest_memfd responsibilities and authority,
>> as he's been instrumental in pushing guest_memfd forward, and his ongoing
>> input and feedback, especially from an mm/ perspective, is and will be
>> critical to keeping us virtualization folks from going too far off the
>> rails.
>
> Thanks for the kind words, Sean!
>
> Acked-by: David Hildenbrand (Arm) <david@kernel.org>
>

Thank you David!

>>
>> Cc: David Hildenbrand <david@kernel.org>
>> Signed-off-by: Sean Christopherson <seanjc@google.com>
>> ---
>>  MAINTAINERS | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 9eceeb6f699d..8dd5cdbef66f 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -14399,6 +14399,7 @@ F:	drivers/video/backlight/ktz8866.c
>>  KVM GUEST_MEMFD
>>  M:	Sean Christopherson <seanjc@google.com>
>>  M:	Paolo Bonzini <pbonzini@redhat.com>
>> +R:	David Hildenbrand <david@kernel.org>
>>  L:	kvm@vger.kernel.org
>>  S:	Supported
>>  T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git
>
>
> --
> Cheers,
>
> David

Re: [RFC PATCH 3/5] MAINTAINERS: Add an entry for KVM's guest_memfd

[Sean Christopherson]

On Thu, Apr 30, 2026, Ackerley Tng wrote:
> Sean Christopherson <seanjc@google.com> writes:
> 
> > To better reflect how guest_memfd has been maintained for the last few
> > years, and to prepare for significant upcoming growth and expansion, add a
> > dedicated MAINTAINERS entry for KVM's guest_memfd, with Paolo and myself
> > (Sean) as co-maintainers.
> >
> > List both the KVM and KVM x86 git trees as authoritative repositories, as
> > any given guest_memfd change has a equal odds of hitting KVM x86 or not.
> >
> > Signed-off-by: Sean Christopherson <seanjc@google.com>
> > ---
> >  MAINTAINERS | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 89b470db22de..9eceeb6f699d 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -14396,6 +14396,15 @@ S:	Maintained
> >  F:	Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
> >  F:	drivers/video/backlight/ktz8866.c
> >
> > +KVM GUEST_MEMFD
> > +M:	Sean Christopherson <seanjc@google.com>
> > +M:	Paolo Bonzini <pbonzini@redhat.com>
> > +L:	kvm@vger.kernel.org
> > +S:	Supported
> > +T:	git git://git.kernel.org/pub/scm/virt/kvm/kvm.git
> > +T:	git https://github.com/kvm-x86/linux.git
> > +F:	virt/kvm/guest_memfd.*
> 
> Should selftests for guest_memfd be added here too?

Hmm, no?  I don't think I want to go to that level of granularity for selftests,
at least not at this time.  Maybe if we end up with a large collection of
guest_memfd specific, arch-agnostic tests, then we could extend the entry?  But
even then, I don't think I want to go that route.

Much of the guest_memfd functionality and testing is in common files and/or
arch-specific code, e.g. a lot of the truly core functionality is in lib/kvm_util.c,
and set_memory_region_test.c and x86/private_mem_conversions_test.c have about as
much guest_memfd testing as guest_memfd_test.c.  I worry that adding a selftests
clause to KVM GUEST_MEMFD would do more harm than good, e.g. create expectations
that guest_memfd testing should be isolated and/or be reviewed differently or
something, without actually making it easier to maintain the tests.

Re: [RFC PATCH 2/5] KVM: guest_memfd: Move gmem function declarations to dedicated guest_memfd.h

[Sean Christopherson]

On Thu, Apr 30, 2026, Ackerley Tng wrote:
> Sean Christopherson <seanjc@google.com> writes:
> 
> > 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.
> >
> 
> This also trims kvm_mm.h, which makes it easier to look stuff
> up. Thanks!
> 
> Shall we do something similar for include/linux/kvm_host.h?

LOL, we can try.  :-)

Not for linux/kvm_host.h, but I've tried to carve up x86's asm/kvm_host.h on
multiple occassions, and have failed miserably every time.

But linux/kvm_host.h is probably less intertwined?  Though I think we should
split out headers if and only if there's substantial .c content as well.  E.g.
if we add kvm_memslots.h, then I would also want kvm_memslots.c, because having
a dedicated headers while leaving the vast majority of memslots code in the
common kvm_main.c would be kludgy.