linux-kernel - Re: [PATCH v13 19/85] KVM: Introduce kvm_follow_pfn() to eventually replace "gfn_to

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Message-ID: <ZxYVnsW9WF1Wp8mx@yzhao56-desk.sh.intel.com>
Date: Mon, 21 Oct 2024 16:49:34 +0800
From: Yan Zhao <yan.y.zhao@...el.com>
To: Sean Christopherson <seanjc@...gle.com>
CC: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
	"Oliver Upton" <oliver.upton@...ux.dev>, Tianrui Zhao
	<zhaotianrui@...ngson.cn>, "Bibo Mao" <maobibo@...ngson.cn>, Huacai Chen
	<chenhuacai@...nel.org>, "Michael Ellerman" <mpe@...erman.id.au>, Anup Patel
	<anup@...infault.org>, "Paul Walmsley" <paul.walmsley@...ive.com>, Palmer
 Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Christian
 Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank
	<frankja@...ux.ibm.com>, "Claudio Imbrenda" <imbrenda@...ux.ibm.com>,
	<kvm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<kvmarm@...ts.linux.dev>, <loongarch@...ts.linux.dev>,
	<linux-mips@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<kvm-riscv@...ts.infradead.org>, <linux-riscv@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Alex Bennée
	<alex.bennee@...aro.org>, David Matlack <dmatlack@...gle.com>, David Stevens
	<stevensd@...omium.org>, Andrew Jones <ajones@...tanamicro.com>
Subject: Re: [PATCH v13 19/85] KVM: Introduce kvm_follow_pfn() to eventually
 replace "gfn_to_pfn" APIs

On Thu, Oct 10, 2024 at 11:23:21AM -0700, Sean Christopherson wrote:
> --- a/virt/kvm/pfncache.c
> +++ b/virt/kvm/pfncache.c
> @@ -159,6 +159,12 @@ static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc)
>  	kvm_pfn_t new_pfn = KVM_PFN_ERR_FAULT;
>  	void *new_khva = NULL;
>  	unsigned long mmu_seq;
> +	struct kvm_follow_pfn kfp = {
> +		.slot = gpc->memslot,
> +		.gfn = gpa_to_gfn(gpc->gpa),
> +		.flags = FOLL_WRITE,
> +		.hva = gpc->uhva,
> +	};
Is .map_writable uninitialized?

>  
>  	lockdep_assert_held(&gpc->refresh_lock);
>  
> @@ -197,8 +203,7 @@ static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc)
>  			cond_resched();
>  		}
>  
> -		/* We always request a writable mapping */
> -		new_pfn = hva_to_pfn(gpc->uhva, false, false, true, NULL);
> +		new_pfn = hva_to_pfn(&kfp);
>  		if (is_error_noslot_pfn(new_pfn))
>  			goto out_error;
>  
> -- 
> 2.47.0.rc1.288.g06298d1525-goog
>