linux-kernel - Re: [RFC PATCH v6 034/104] KVM: x86/mmu: Add address conversion functions for TDX shared bits

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Date:   Thu, 12 May 2022 02:50:16 -0700
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     Kai Huang <kai.huang@...el.com>
Cc:     isaku.yamahata@...el.com, 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>
Subject: Re: [RFC PATCH v6 034/104] KVM: x86/mmu: Add address conversion
 functions for TDX shared bits

On Tue, May 10, 2022 at 12:16:58PM +1200,
Kai Huang <kai.huang@...el.com> wrote:

> On Thu, 2022-05-05 at 11:14 -0700, isaku.yamahata@...el.com wrote:
> > From: Rick Edgecombe <rick.p.edgecombe@...el.com>
...
> > diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> > index 909372762363..d1c37295bb6e 100644
> > --- a/arch/x86/kvm/mmu/mmu.c
> > +++ b/arch/x86/kvm/mmu/mmu.c
> > @@ -264,8 +264,10 @@ static void kvm_flush_remote_tlbs_with_range(struct kvm *kvm,
> >  {
> >  	int ret = -ENOTSUPP;
> >  
> > -	if (range && kvm_x86_ops.tlb_remote_flush_with_range)
> > +	if (range && kvm_available_flush_tlb_with_range()) {
> > +		/* Callback should flush both private GFN and shared GFN. */
> >  		ret = static_call(kvm_x86_tlb_remote_flush_with_range)(kvm, range);
> > +	}
> 
> ??

Dropped this hunk.


> >  	if (ret)
> >  		kvm_flush_remote_tlbs(kvm);
> > @@ -4048,7 +4050,7 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault
> >  	unsigned long mmu_seq;
> >  	int r;
> >  
> > -	fault->gfn = fault->addr >> PAGE_SHIFT;
> > +	fault->gfn = gpa_to_gfn(fault->addr) & ~kvm_gfn_shared_mask(vcpu->kvm);
> >  	fault->slot = kvm_vcpu_gfn_to_memslot(vcpu, fault->gfn);
> >  
> >  	if (page_fault_handle_page_track(vcpu, fault))
> 
> As I said in previous version, this above change alone is broken:
> 
> https://lore.kernel.org/lkml/cover.1646422845.git.isaku.yamahata@intel.com/T/#mcd5c235e3577f5129810f3183f151a1c5f63466e
> 
> Why cannot this patch be merged to other patch(es) which truly adds
> private/shared mapping support?
> 
> Or did I get something wrong?

Oops. Somehow I missed this part. I moved this part to "TDP MMU TDX support".

-- 
Isaku Yamahata <isaku.yamahata@...il.com>