linux-kernel - Re: [PATCH v13 09/35] KVM: Add KVM_EXIT_MEMORY_FAULT exit to report faults to userspace

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Message-ID: <55672e5b0ff9855e609654b6565f610dbffa56fd.camel@intel.com>
Date:   Thu, 2 Nov 2023 18:35:20 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>
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Subject: Re: [PATCH v13 09/35] KVM: Add KVM_EXIT_MEMORY_FAULT exit to report
 faults to userspace

On Thu, 2023-11-02 at 08:44 -0700, Sean Christopherson wrote:
> On Thu, Nov 02, 2023, Paolo Bonzini wrote:
> > On 11/2/23 10:35, Huang, Kai wrote:
> > > IIUC KVM can already handle the case of poisoned
> > > page by sending signal to user app:
> > > 
> > >  	static int kvm_handle_error_pfn(struct kvm_vcpu *vcpu, 			struct
> > > kvm_page_fault *fault)                                               	{
> > >  		...
> > > 
> > >         		if (fault->pfn == KVM_PFN_ERR_HWPOISON) {
> > >                		kvm_send_hwpoison_signal(fault->slot, fault->gfn);
> 
> No, this doesn't work, because that signals the host virtual address

Ah, right :-)