Avi Kivity wrote: > Avi Kivity wrote: >> Anthony Liguori wrote: >> >>> This patch refactors the current hypercall infrastructure to better >>> support live >>> migration and SMP. It eliminates the hypercall page by trapping the UD >>> exception that would occur if you used the wrong hypercall >>> instruction for the >>> underlying architecture and replacing it with the right one lazily. >>> >>> It also introduces the infrastructure to probe for hypercall >>> available via >>> CPUID leaves 0x40000000. CPUID leaf 0x40000001 should be filled out by >>> userspace. >>> >>> A fall-out of this patch is that the unhandled hypercalls no longer >>> trap to >>> userspace. There is very little reason though to use a hypercall to >>> communicate >>> with userspace as PIO or MMIO can be used. There is no code in tree >>> that uses >>> userspace hypercalls. >>> >>> >> >> >> Surprisingly, this patch kills Windows XP (ACPI HAL). I'll try to >> find out why. >> >> > > Not trapping #UD brings things back to normal. So, Windows likes to > execute undefined instructions, and we don'd handle these well. > Okay, vmx_inject_ud() was broken. Fixed now.
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