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Message-ID: <ZLmW+9G6EbKLkOOz@google.com>
Date: Thu, 20 Jul 2023 13:20:11 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Isaku Yamahata <isaku.yamahata@...il.com>
Cc: Yuan Yao <yuan.yao@...ux.intel.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Marc Zyngier <maz@...nel.org>,
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"Matthew Wilcox (Oracle)" <willy@...radead.org>,
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"Serge E. Hallyn" <serge@...lyn.com>, kvm@...r.kernel.org,
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Liam Merwick <liam.merwick@...cle.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFC PATCH v11 08/29] KVM: Introduce per-page memory attributes
On Thu, Jul 20, 2023, Isaku Yamahata wrote:
> On Thu, Jul 20, 2023 at 04:09:12PM +0800,
> Yuan Yao <yuan.yao@...ux.intel.com> wrote:
>
> > On Tue, Jul 18, 2023 at 04:44:51PM -0700, Sean Christopherson wrote:
> > > @@ -2301,4 +2305,14 @@ static inline void kvm_account_pgtable_pages(void *virt, int nr)
> > > /* Max number of entries allowed for each kvm dirty ring */
> > > #define KVM_DIRTY_RING_MAX_ENTRIES 65536
> > >
> > > +#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
> > > +static inline unsigned long kvm_get_memory_attributes(struct kvm *kvm, gfn_t gfn)
> > > +{
> > > + return xa_to_value(xa_load(&kvm->mem_attr_array, gfn));
> > > +}
> > > +
> > > +bool kvm_arch_post_set_memory_attributes(struct kvm *kvm,
> > > + struct kvm_gfn_range *range);
> >
> > Used but no definition in this patch, it's defined in next patch 09.
> > How about add weak version in this patch and let ARCHs to overide it ?
>
> It is guarded by CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES.
Yep. I don't love the ordering, e.g. this patch can't even be compile tested
until later in the series, but I wanted to separate x86 usage from the generic
support code.
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