[RFC PATCH v11 12/29] KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory
Sean Christopherson
seanjc at google.com
Fri Jul 21 17:42:58 UTC 2023
On Fri, Jul 21, 2023, Xiaoyao Li wrote:
> On 7/21/2023 11:05 PM, Xiaoyao Li wrote:
> > On 7/19/2023 7:44 AM, Sean Christopherson wrote:
> > > @@ -6255,12 +6298,17 @@ int kvm_init(unsigned vcpu_size, unsigned
> > > vcpu_align, struct module *module)
> > > if (r)
> > > goto err_async_pf;
> > > + r = kvm_gmem_init();
> > > + if (r)
> > > + goto err_gmem;
> > > +
> > > kvm_chardev_ops.owner = module;
> > > kvm_preempt_ops.sched_in = kvm_sched_in;
> > > kvm_preempt_ops.sched_out = kvm_sched_out;
> > > kvm_init_debug();
> > > + kvm_gmem_init();
> >
> > why kvm_gmem_init() needs to be called again? by mistake?
>
> I'm sure it's a mistake.
Yeah, definitely a bug.
> I'm testing the gmem QEMU with this series. SW_PROTECTED_VM gets stuck in a
> loop in early OVMF code due to two shared page of OVMF get zapped and
> re-mapped infinitely. Removing the second call of kvm_gmem_init() can solve
> the issue, though I'm not sure about the reason.
Not worth investigating unless you want to satiate your curiosity :-)
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