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SubjectRe: [PATCH RFC V5 3/6] kvm : Add unhalt msr to aid (live) migration
On Fri, Mar 23, 2012 at 01:37:26PM +0530, Raghavendra K T wrote:
> From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
>
> Currently guest does not need to know pv_unhalt state and intended to be
> used via GET/SET_MSR ioctls during migration.
>
> Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
> ---
> diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
> index 9234f13..46f9751 100644
> --- a/arch/x86/include/asm/kvm_para.h
> +++ b/arch/x86/include/asm/kvm_para.h
> @@ -40,6 +40,7 @@
> #define MSR_KVM_SYSTEM_TIME_NEW 0x4b564d01
> #define MSR_KVM_ASYNC_PF_EN 0x4b564d02
> #define MSR_KVM_STEAL_TIME 0x4b564d03
> +#define MSR_KVM_PV_UNHALT 0x4b564d04
>
> struct kvm_steal_time {
> __u64 steal;
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index bd5ef91..38e6c47 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -784,12 +784,13 @@ EXPORT_SYMBOL_GPL(kvm_rdpmc);
> * kvm-specific. Those are put in the beginning of the list.
> */
>
> -#define KVM_SAVE_MSRS_BEGIN 9
> +#define KVM_SAVE_MSRS_BEGIN 10
> static u32 msrs_to_save[] = {
> MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
> MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
> HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
> HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
> + MSR_KVM_PV_UNHALT,
> MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
> MSR_STAR,
> #ifdef CONFIG_X86_64
> @@ -1606,7 +1607,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
> kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
>
> break;
> -
> + case MSR_KVM_PV_UNHALT:
> + vcpu->pv_unhalted = (u32) data;
> + break;
> case MSR_IA32_MCG_CTL:
> case MSR_IA32_MCG_STATUS:
> case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
> @@ -1917,6 +1920,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
> case MSR_KVM_STEAL_TIME:
> data = vcpu->arch.st.msr_val;
> break;
> + case MSR_KVM_PV_UNHALT:
> + data = (u64)vcpu->pv_unhalted;
> + break;
> case MSR_IA32_P5_MC_ADDR:
> case MSR_IA32_P5_MC_TYPE:
> case MSR_IA32_MCG_CAP:

Unless there is a reason to use an MSR, should use a normal ioctl
such as KVM_{GET,SET}_MP_STATE.


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