On 09/07/2011 07:45 PM, Liu, Jinsong wrote:
Avi Kivity wrote: >> >> --- a/arch/x86/include/asm/msr-index.h >> +++ b/arch/x86/include/asm/msr-index.h >> @@ -229,6 +229,8 @@ >> #define MSR_IA32_APICBASE_ENABLE (1<<11) >> #define MSR_IA32_APICBASE_BASE (0xfffff<<12) >> >> +#define MSR_IA32_TSCDEADLINE 0x000006e0 >> + >> #define MSR_IA32_UCODE_WRITE 0x00000079 >> #define MSR_IA32_UCODE_REV 0x0000008b >> > > Need to add to msrs_to_save so live migration works. > 2 questions: 1). how about add to emulated_msrs instead of msrs_to_save? msrs_to_save modified at runtime and depend on capacibility of host cpu.
Look at kvm_init_msrs_list(), it does the checks.
2). do we need add code at qemu (kvm_get_msrs/ kvm_put_msrs) to expose MSR_IA32_TSCDEADLINE to userspace?
It should be automatic. Better check it though that you can live-migrate a guest that uses TSC deadline. Please add a testcase to kvm-unit-tests.git (there's x86/apic.c, can probably be added there easily).
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