linux-kernel - Re: [PATCH v18 050/121] KVM: x86/tdp_mmu: Sprinkle __must

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Date: Tue, 30 Jan 2024 16:14:15 +0800
From: Binbin Wu <binbin.wu@...ux.intel.com>
To: isaku.yamahata@...el.com
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
 isaku.yamahata@...il.com, Paolo Bonzini <pbonzini@...hat.com>,
 erdemaktas@...gle.com, Sean Christopherson <seanjc@...gle.com>,
 Sagi Shahar <sagis@...gle.com>, Kai Huang <kai.huang@...el.com>,
 chen.bo@...el.com, hang.yuan@...el.com, tina.zhang@...el.com
Subject: Re: [PATCH v18 050/121] KVM: x86/tdp_mmu: Sprinkle __must_check



On 1/23/2024 7:53 AM, isaku.yamahata@...el.com wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
>
> TDP MMU allows tdp_mmu_set_spte_atomic() and tdp_mmu_zap_spte_atomic() to
> return -EBUSY or -EAGAIN error.  The caller must check the return value and
> retry.  Sprinkle __must_check to guarantee it.

Reviewed-by: Binbin Wu <binbin.wu@...ux.intel.com>

>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> ---
>   arch/x86/kvm/mmu/tdp_mmu.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
> index fdc6e2221c33..2aacfab25e93 100644
> --- a/arch/x86/kvm/mmu/tdp_mmu.c
> +++ b/arch/x86/kvm/mmu/tdp_mmu.c
> @@ -507,9 +507,9 @@ static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
>    *            no side-effects other than setting iter->old_spte to the last
>    *            known value of the spte.
>    */
> -static inline int tdp_mmu_set_spte_atomic(struct kvm *kvm,
> -					  struct tdp_iter *iter,
> -					  u64 new_spte)
> +static inline int __must_check tdp_mmu_set_spte_atomic(struct kvm *kvm,
> +						       struct tdp_iter *iter,
> +						       u64 new_spte)
>   {
>   	u64 *sptep = rcu_dereference(iter->sptep);
>   
> @@ -539,8 +539,8 @@ static inline int tdp_mmu_set_spte_atomic(struct kvm *kvm,
>   	return 0;
>   }
>   
> -static inline int tdp_mmu_zap_spte_atomic(struct kvm *kvm,
> -					  struct tdp_iter *iter)
> +static inline int __must_check tdp_mmu_zap_spte_atomic(struct kvm *kvm,
> +						       struct tdp_iter *iter)
>   {
>   	int ret;
>