On 7/27/24 01:51, Sean Christopherson wrote:

Add a kvm_follow_pfn() wrapper, kvm_lookup_pfn(), to allow looking up a
gfn=>pfn mapping without the caller getting a reference to any underlying
page.  The API will be used in flows that want to know if a gfn points at
a valid pfn, but don't actually need to do anything with the pfn.

Can you rename the function kvm_gfn_has_pfn(), or 
kvm_gfn_can_be_mapped(), and make it return a bool?

(As an aside, I wonder if reexecute_instruction() could just use 
kvm_is_error_hva(kvm_vcpu_gfn_to_hva(vcpu, gpa_to_gfn(gpa)) instead of 
going all the way to a pfn.  But it's ok to be more restrictive).

Paolo