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    Subject[PATCH RFC V5 3/6] kvm : Add unhalt msr to aid (live) migration
    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:


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