> > On Wed, Jul 2, 2014 at 2:14 PM, <kan.li...@intel.com> wrote: > > From: Kan Liang <kan.li...@intel.com> > > > > x86, perf: Protect LBR and offcore rsp against KVM lying > > > > With -cpu host, KVM reports LBR and offcore support, if the host has > support. > > When the guest perf driver tries to access LBR or offcore_rsp MSR, it > > #GPs all MSR accesses,since KVM doesn't handle LBR and offcore support. > > So check the related MSRs access right once at initialization time to avoid > the error access at runtime. > > > > For reproducing the issue, please build the kernel with > CONFIG_KVM_INTEL = y. > This is for host kernel, > > And CONFIG_PARAVIRT = n and CONFIG_KVM_GUEST = n. > And this is for guest kernel, right? >
Right. > -Jidong
