Re: [Xen-devel] Bug: Xen panics with #UD in acpi_processor_idle()

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 22.11.10 at 14:02, Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Somehow offtopic: what is the purpose of cheating about
> MSR_IA32_MISC_ENABLE_MONITOR_ENABLE state to dom0 in rdmsr emulation ?
> xen-4.0-testing.hg/xen/arch/x86/traps.c:2364
>         case MSR_IA32_MISC_ENABLE:
>             if ( rdmsr_safe(regs->ecx, regs->eax, regs->edx) )
>                 goto fail;
>             regs->eax &= ~(MSR_IA32_MISC_ENABLE_PERF_AVAIL |
>                            MSR_IA32_MISC_ENABLE_MONITOR_ENABLE);
>             regs->eax |= MSR_IA32_MISC_ENABLE_BTS_UNAVAIL |
>                          MSR_IA32_MISC_ENABLE_PEBS_UNAVAIL |
>                          MSR_IA32_MISC_ENABLE_XTPR_DISABLE; 
>             break;

This is dealing with bits corresponding to features no domain
should use (directly).

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel