Re: [Xen-devel] HVMOP_guest_request_vm_event only works from guest in ring0

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 04/08/16 08:13, Jan Beulich wrote:
>>>> On 03.08.16 at 22:44, <andrew.cooper3@xxxxxxxxxx> wrote:
>> --- a/xen/arch/x86/hvm/hvm.c
>> +++ b/xen/arch/x86/hvm/hvm.c
>> @@ -5194,8 +5194,14 @@ int hvm_do_hypercall(struct cpu_user_regs *regs)
>>      switch ( mode )
>>      {
>>      case 8:       
>> +        if ( eax == __HYPERVISOR_hvm_op &&
>> +             regs->rdi == HVMOP_guest_request_vm_event )
>> +            break;
>>      case 4:
>>      case 2:
>> +        if ( eax == __HYPERVISOR_hvm_op &&
>> +             regs->ebx == HVMOP_guest_request_vm_event )
> I think you really mean _ebx here.

True, but it is very hard in 32 or 16bit code to have upper bits set in
the 64bit register.

~Andrew

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