linux-kernel - Re: [PATCH v9 04/15] KVM: pfncache: add a mark-dirty helper

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Message-ID: <e8beb0b9879062d6593f089b8c8c6a84485d28ad.camel@infradead.org>
Date:   Wed, 22 Nov 2023 12:24:53 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Paul Durrant <paul@....org>,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 04/15] KVM: pfncache: add a mark-dirty helper

On Wed, 2023-11-22 at 12:18 +0000, Paul Durrant wrote:
> 
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1367,6 +1367,16 @@ int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, unsigned long len);
>   */
>  void kvm_gpc_deactivate(struct gfn_to_pfn_cache *gpc);
>  
> +/**
> + * kvm_gpc_mark_dirty - mark a cached page as dirty.
> + *
> + * @gpc:          struct gfn_to_pfn_cache object.
> + */
> +static inline void kvm_gpc_mark_dirty(struct gfn_to_pfn_cache *gpc)
> +{
> +       mark_page_dirty_in_slot(gpc->kvm, gpc->memslot, gpc->gpa >> PAGE_SHIFT);
> +}

This doesn't rescind my existing ack, but it's probably worth asserting
that gpc->lock is held here?

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