Commit 2d5faa6a authored by Juergen Gross's avatar Juergen Gross Committed by Sean Christopherson
Browse files

KVM/x86: add comment to kvm_mmu_do_page_fault() 



On a first glance it isn't obvious why calling kvm_tdp_page_fault() in
kvm_mmu_do_page_fault() is special cased, as the general case of using
an indirect case would result in calling of kvm_tdp_page_fault()
anyway.

Add a comment to explain the reason.

Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20241108161416.28552-1-jgross@suse.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 3522c419

arch/x86/kvm/mmu/mmu_internal.h

+4 −0
Original line number Diff line number Diff line
@@ -321,6 +321,10 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, 
		fault.slot = kvm_vcpu_gfn_to_memslot(vcpu, fault.gfn);

	}



	/*

	 * With retpoline being active an indirect call is rather expensive,

	 * so do a direct call in the most common case.

	 */

	if (IS_ENABLED(CONFIG_MITIGATION_RETPOLINE) && fault.is_tdp)

		r = kvm_tdp_page_fault(vcpu, &fault);

	else