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KVM x86 MMU changes for 6.14:

Browse Source 
- Add a comment to kvm_mmu_do_page_fault() to explain why KVM performs a
    direct call to kvm_tdp_page_fault() when RETPOLINE is enabled.
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Merge tag 'kvm-x86-mmu-6.14' of https://github.com/kvm-x86/linux into HEAD

KVM x86 MMU changes for 6.14:

 - Add a comment to kvm_mmu_do_page_fault() to explain why KVM performs a
   direct call to kvm_tdp_page_fault() when RETPOLINE is enabled.
This commit is contained in:
Paolo Bonzini 2025-01-20 06:36:55 -05:00
commit cae083c4e7
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/mmu/mmu_internal.h
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@ -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