linux-kernel - [PATCH v2 04/13] KVM: Explicitly mark KVM_GUEST_MEMFD as depending on KVM_GENERIC_MMU

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Message-ID: <20251003232606.4070510-5-seanjc@google.com>
Date: Fri,  3 Oct 2025 16:25:57 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Sean Christopherson <seanjc@...gle.com>, 
	Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>, 
	Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	David Hildenbrand <david@...hat.com>, Fuad Tabba <tabba@...gle.com>, 
	Ackerley Tng <ackerleytng@...gle.com>
Subject: [PATCH v2 04/13] KVM: Explicitly mark KVM_GUEST_MEMFD as depending on KVM_GENERIC_MMU_NOTIFIER

Add KVM_GENERIC_MMU_NOTIFIER as a dependency for selecting KVM_GUEST_MEMFD,
as guest_memfd relies on kvm_mmu_invalidate_{begin,end}(), which are
defined if and only if the generic mmu_notifier implementation is enabled.

The missing dependency is currently benign as s390 is the only KVM arch
that doesn't utilize the generic mmu_notifier infrastructure, and s390
doesn't currently support guest_memfd.

Fixes: a7800aa80ea4 ("KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory")
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 virt/kvm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 1b7d5be0b6c4..a01cc5743137 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -113,6 +113,7 @@ config KVM_GENERIC_MEMORY_ATTRIBUTES
        bool
 
 config KVM_GUEST_MEMFD
+       depends on KVM_GENERIC_MMU_NOTIFIER
        select XARRAY_MULTI
        bool
 
-- 
2.51.0.618.g983fd99d29-goog