>>> On 05.11.15 at 11:49, <andrew.coop...@citrix.com> wrote: > On 05/11/15 10:42, Jan Beulich wrote: >>>>> On 05.11.15 at 10:52, <rcojoc...@bitdefender.com> wrote: >>> I need to get the XSAVE size from userspace. The easiest way seems to be >>> to use the XEN_DOMCTL_getvcpuextstate hypercall, but that hypercall is >>> not public / there's no xenctrl.h wrapper for it. >> Before going into any detail of the rest of your mail - any reason you >> can't just consult CPUID output? > > It depends on precisely what you want. > > CPUID.0xD[0].ecx gives you the maximum xsave area on this processor > CPUID.0xD[0].ebx gives you the current size for the value in xcr0, but > that is not very useful from userspace.
Why would the maximum size not be sufficient for most (all?) user mode purposes? Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
