[RFC PATCH v11 12/29] KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory

[Xiaoyao Li]

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.

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.