[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] xsave=0 workaround needed on 3.2 kernels with Xen 4.1 or Xen-unstable.
>>> On 08.05.12 at 01:57, AP <apxeng@xxxxxxxxx> wrote: > On Mon, May 7, 2012 at 7:15 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote: >> Sure, as it's a kernel problem. It's the kernel that needs logging added, >> to find out why the CR4 write supposedly happening immediately >> prior to the XSETBV (set_in_cr4(X86_CR4_OSXSAVE)) doesn't actually >> happen, or doesn't set the flag. Perhaps something fishy going on > > xen_write_cr4 explicitly turns off X86_CR4_OSXSAVE. > > static void xen_write_cr4(unsigned long cr4) > { > cr4 &= ~X86_CR4_PGE; > cr4 &= ~X86_CR4_PSE; > cr4 &= ~X86_CR4_OSXSAVE; > > native_write_cr4(cr4); > } That's definitely not the case in _any_ upstream Linux release. Which means that this must be introduced by a distro-specific (and broken) patch. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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