On Tue, Jun 14, 2016 at 10:21:41AM +0200, Paolo Bonzini wrote:
>
>
> On 14/06/2016 07:01, Chao Peng wrote:
> >> >
> >> > Which are the CPUID leaves for which KVM_GET_SUPPORTED_CPUID is not
> >> > stateless? I cannot find any.
> > I have though leaf 0xd, sub leaf 1 is not stateless, as the size
On 14/06/2016 07:01, Chao Peng wrote:
>> >
>> > Which are the CPUID leaves for which KVM_GET_SUPPORTED_CPUID is not
>> > stateless? I cannot find any.
> I have though leaf 0xd, sub leaf 1 is not stateless, as the size of
> xsave buffer(EBX) is based on XCR0 | IA32_XSS. But after looking KVM
>
On Mon, Jun 13, 2016 at 12:02:41PM +0200, Paolo Bonzini wrote:
>
>
> On 13/06/2016 04:21, Chao Peng wrote:
> > KVM_GET_SUPPORTED_CPUID ioctl is called frequently when initializing
> > CPU. Depends on CPU features and CPU count, the number of calls can be
> > extremely high which slows down QEMU
On 13/06/2016 04:21, Chao Peng wrote:
> KVM_GET_SUPPORTED_CPUID ioctl is called frequently when initializing
> CPU. Depends on CPU features and CPU count, the number of calls can be
> extremely high which slows down QEMU booting significantly. In our
> testing, we saw 5922 calls with switches:
>
KVM_GET_SUPPORTED_CPUID ioctl is called frequently when initializing
CPU. Depends on CPU features and CPU count, the number of calls can be
extremely high which slows down QEMU booting significantly. In our
testing, we saw 5922 calls with switches:
-cpu SandyBridge -smp
