On 8/7/26 23:52, Ackerley Tng via B4 Relay wrote:
> From: Sean Christopherson <[email protected]>
>
> 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_mem_is_private() 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.
>
> Cc: Fuad Tabba <[email protected]>
> Cc: Xiaoyao Li <[email protected]>
> Signed-off-by: Sean Christopherson <[email protected]>
> Co-developed-by: Ackerley Tng <[email protected]>
> Signed-off-by: Ackerley Tng <[email protected]>
> ---
> include/linux/kvm_host.h | 6 ++++++
> virt/kvm/guest_memfd.c | 26 ++++++++++++++++++++++++++
> virt/kvm/kvm_main.c | 12 +++++++++++-
> 3 files changed, 43 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 65fbce46b63f4..9477ecebbbced 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -2580,6 +2580,8 @@ static inline bool kvm_vm_mem_is_private(struct kvm
> *kvm, gfn_t gfn)
> #endif /* CONFIG_KVM_VM_MEMORY_ATTRIBUTES */
>
> #ifdef kvm_arch_has_private_mem
> +extern bool gmem_in_place_conversion;
Is there a "supports/has/enable" in there? And should we call it "kvm_gmem" for
completeness?
> +
> typedef bool (kvm_mem_is_private_t)(struct kvm *kvm, gfn_t gfn);
> DECLARE_STATIC_CALL(__kvm_mem_is_private, kvm_mem_is_private_t);
>
> @@ -2588,6 +2590,8 @@ static inline bool kvm_mem_is_private(struct kvm *kvm,
> gfn_t gfn)
> return static_call(__kvm_mem_is_private)(kvm, gfn);
> }
> #else
> +#define gmem_in_place_conversion false
> +
> static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn)
> {
> return false;
> @@ -2595,6 +2599,8 @@ static inline bool kvm_mem_is_private(struct kvm *kvm,
> gfn_t gfn)
> #endif /* kvm_arch_has_private_mem */
>
> #ifdef CONFIG_KVM_GUEST_MEMFD
> +bool kvm_gmem_is_private(struct kvm *kvm, gfn_t gfn);
As mentioned in v9, the name is confusing.
kvm_gmem_mem_is_private
?
--
Cheers,
David
