On 6/19/2026 8:31 AM, Ackerley Tng via B4 Relay wrote:
From: Sean Christopherson <[email protected]>
Introduce a generic kvm_mem_is_private() interface using a static call to
determine if a GFN is private. This allows the implementation for checking
a GFN's private/shared status to be set at runtime.
In preparation for choosing implementations between a guest_memfd lookup
and the existing VM attribute lookup, rename the existing
VM-attribute-based check to kvm_vm_mem_is_private to emphasize that it
looks up VM attributes.
Signed-off-by: Sean Christopherson <[email protected]>
Reviewed-by: Xiaoyao Li <[email protected]>
One nit below.
---
include/linux/kvm_host.h | 12 +++++++++++-
virt/kvm/kvm_main.c | 15 +++++++++++++++
2 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index eb26d4ea8945a..3915da2a61778 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2546,7 +2546,7 @@ bool kvm_arch_pre_set_memory_attributes(struct kvm *kvm,
bool kvm_arch_post_set_memory_attributes(struct kvm *kvm,
struct kvm_gfn_range *range);
-static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn)
+static inline bool kvm_vm_mem_is_private(struct kvm *kvm, gfn_t gfn)
{
return kvm_get_vm_memory_attributes(kvm, gfn) &
KVM_MEMORY_ATTRIBUTE_PRIVATE;
}
@@ -2557,6 +2557,16 @@ static inline bool kvm_mem_range_is_private(struct kvm
*kvm, gfn_t start,
KVM_MEMORY_ATTRIBUTE_PRIVATE,
KVM_MEMORY_ATTRIBUTE_PRIVATE);
}
+#endif /* CONFIG_KVM_VM_MEMORY_ATTRIBUTES */
Since it stops the original #define scope of
CONFIG_KVM_VM_MEMORY_ATTRIBUTES here, ...
+#ifdef kvm_arch_has_private_mem
+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);
+
+static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn)
+{
+ return static_call(__kvm_mem_is_private)(kvm, gfn);
+}
#else
static inline bool kvm_mem_is_private(struct kvm *kvm, gfn_t gfn)
{
... we need to update the comment of #endif to match with the new scope
kvm_arch_has_private_mem as below. Or just delete the comment.
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -2572,7 +2572,7 @@ static inline bool kvm_mem_is_private(struct kvm
*kvm, gfn_t gfn)
{
return false;
}
-#endif /* CONFIG_KVM_VM_MEMORY_ATTRIBUTES */
+#endif /* kvm_arch_has_private_mem */
#ifdef CONFIG_KVM_GUEST_MEMFD
int kvm_gmem_get_pfn(struct kvm *kvm, struct kvm_memory_slot *slot,
