On Thu, May 16, 2013 at 07:13:41PM +1000, Vadim Rozenfeld wrote: > On Thu, 2013-05-16 at 11:34 +0300, Gleb Natapov wrote: > > On Mon, May 13, 2013 at 09:45:16PM +1000, Vadim Rozenfeld wrote: > > > Signed-off: Peter Lieven <pl@xxxxxxx> > > > Signed-off: Gleb Natapov <gleb@xxxxxxxxxx> > > > Signed-off: Vadim Rozenfeld <vrozenfe@xxxxxxxxxx> > > > > > > The following patch allows to activate Hyper-V > > > reference time counter > > > --- > > > arch/x86/include/asm/kvm_host.h | 2 ++ > > > arch/x86/include/uapi/asm/hyperv.h | 3 +++ > > > arch/x86/kvm/x86.c | 25 ++++++++++++++++++++++++- > > > 3 files changed, 29 insertions(+), 1 deletion(-) > > > > > > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h > > > index 3741c65..f0fee35 100644 > > > --- a/arch/x86/include/asm/kvm_host.h > > > +++ b/arch/x86/include/asm/kvm_host.h > > > @@ -575,6 +575,8 @@ struct kvm_arch { > > > /* fields used by HYPER-V emulation */ > > > u64 hv_guest_os_id; > > > u64 hv_hypercall; > > > + u64 hv_ref_count; > > > + u64 hv_tsc_page; > > > > > > #ifdef CONFIG_KVM_MMU_AUDIT > > > int audit_point; > > > diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h > > > index b80420b..9711819 100644 > > > --- a/arch/x86/include/uapi/asm/hyperv.h > > > +++ b/arch/x86/include/uapi/asm/hyperv.h > > > @@ -136,6 +136,9 @@ > > > /* MSR used to read the per-partition time reference counter */ > > > #define HV_X64_MSR_TIME_REF_COUNT 0x40000020 > > > > > > +/* A partition's reference time stamp counter (TSC) page */ > > > +#define HV_X64_MSR_REFERENCE_TSC 0x40000021 > > > + > > > /* Define the virtual APIC registers */ > > > #define HV_X64_MSR_EOI 0x40000070 > > > #define HV_X64_MSR_ICR 0x40000071 > > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > > > index 094b5d9..1a4036d 100644 > > > --- a/arch/x86/kvm/x86.c > > > +++ b/arch/x86/kvm/x86.c > > > @@ -843,7 +843,7 @@ EXPORT_SYMBOL_GPL(kvm_rdpmc); > > > 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_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,HV_X64_MSR_TIME_REF_COUNT, > > > HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME, > > > MSR_KVM_PV_EOI_EN, > > > MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, > > > @@ -1764,6 +1764,8 @@ static bool kvm_hv_msr_partition_wide(u32 msr) > > > switch (msr) { > > > case HV_X64_MSR_GUEST_OS_ID: > > > case HV_X64_MSR_HYPERCALL: > > > + case HV_X64_MSR_REFERENCE_TSC: > > > + case HV_X64_MSR_TIME_REF_COUNT: > > > r = true; > > > break; > > > } > > > @@ -1803,6 +1805,21 @@ static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data) > > > if (__copy_to_user((void __user *)addr, instructions, 4)) > > > return 1; > > > kvm->arch.hv_hypercall = data; > > > + kvm->arch.hv_ref_count = get_kernel_ns(); > > > + break; > > > + } > > > + case HV_X64_MSR_REFERENCE_TSC: { > > > + u64 gfn; > > > + unsigned long addr; > > > + u32 tsc_ref; > > > + gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT; > > Shouldn't you check HV_X64_MSR_TSC_REFERENCE_ENABLE here? > > Yes, I have this check added in the second patch. > Move it here please. > > > > > + addr = gfn_to_hva(kvm, gfn); > > > + if (kvm_is_error_hva(addr)) > > > + return 1; > > > + tsc_ref = 0; > > > + if(__copy_to_user((void __user *)addr, &tsc_ref, sizeof(tsc_ref))) > > > + return 1; > > > + kvm->arch.hv_tsc_page = data; > > > break; > > > } > > > default: > > > @@ -2229,6 +2246,12 @@ static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) > > > case HV_X64_MSR_HYPERCALL: > > > data = kvm->arch.hv_hypercall; > > > break; > > > + case HV_X64_MSR_TIME_REF_COUNT: > > > + data = div_u64(get_kernel_ns() - kvm->arch.hv_ref_count,100); > > > + break; > > > + case HV_X64_MSR_REFERENCE_TSC: > > > + data = kvm->arch.hv_tsc_page; > > > + break; > > > default: > > > vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr); > > > return 1; > > > -- > > > 1.8.1.2 > > > > -- > > Gleb. > -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html