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| author | Sean Christopherson <seanjc@google.com> | 2026-09-10 16:55:35 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2026-09-22 07:28:25 -0700 |
| commit | ee1168fb73136dc1bd6b6f26142fdaa2399a2d60 (patch) | |
| tree | f5a50123eadeec3e795b5a8e36ec2ed95955d259 /include | |
| parent | 8ab5719fbcdc96f5e636b67f14204ef7670abde1 (diff) | |
| download | linux-next-ee1168fb73136dc1bd6b6f26142fdaa2399a2d60.tar.gz linux-next-ee1168fb73136dc1bd6b6f26142fdaa2399a2d60.zip | |
KVM: guest_memfd: Stub in ability to enable in-place shared<=>private conversion
Stub in global variable to enable in-place guest_memfd private<=>shared
memory conversion, which will eventually be exposed to userspace via a
module param, and wire up the __kvm_is_private_gfn() static call to the
guest_memfd version when in-place conversion is enabled, i.e. when gmem is
the sole authority on private vs. shared memory.
Co-developed-by: Ackerley Tng <ackerleytng@google.com>
Signed-off-by: Ackerley Tng <ackerleytng@google.com>
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Fuad Tabba <tabba@google.com>
Cc: Xiaoyao Li <xiaoyao.li@intel.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Link: https://patch.msgid.link/20260910-gmem-inplace-conversion-v13-9-dd6fbf94f4e1@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/kvm_host.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 3579feb63177..b0110143d2ff 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -2580,6 +2580,8 @@ static inline bool kvm_vm_is_private_gfn(struct kvm *kvm, gfn_t gfn) #endif /* CONFIG_KVM_VM_MEMORY_ATTRIBUTES */ #ifdef kvm_arch_has_private_mem +extern bool gmem_in_place_conversion; + typedef bool (kvm_is_private_gfn_t)(struct kvm *kvm, gfn_t gfn); DECLARE_STATIC_CALL(__kvm_is_private_gfn, kvm_is_private_gfn_t); @@ -2588,6 +2590,8 @@ static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn) return static_call(__kvm_is_private_gfn)(kvm, gfn); } #else +#define gmem_in_place_conversion false + static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn) { return false; @@ -2595,6 +2599,8 @@ static inline bool kvm_is_private_gfn(struct kvm *kvm, gfn_t gfn) #endif /* kvm_arch_has_private_mem */ #ifdef CONFIG_KVM_GUEST_MEMFD +bool kvm_gmem_is_private_gfn(struct kvm *kvm, gfn_t gfn); + int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot, gfn_t gfn, kvm_pfn_t *pfn, int *max_order); #else |