Gleb Natapov wrote:
I thought KVM emulates the syscall instruction? I swear I've seen patches for that.It is. Starting from 2.6.32.
Okay, so this is a performance vs. migration compatibility issue then?BTW, couldn't we just not advertise syscall in cpuid? That should fix it too without sacrificing migration compatibility. We get a slight slowdown on AMD hosts but that's probably minor compared to the cost of using emulated syscall on Intel hosts.
Regards, Anthony Liguori
