On Tue, 2013-05-14 at 16:14 +0200, Peter Lieven wrote: > On 13.05.2013 13:45, Vadim Rozenfeld wrote: > > Signed-off: Peter Lieven <[email protected]> > > Signed-off: Gleb Natapov <[email protected]> > > Signed-off: Vadim Rozenfeld <[email protected]> > > > > 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; > > + 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; > > > in an earlier version of this patch I have the following: > > + case HV_X64_MSR_TIME_REF_COUNT: { > + u64 now_ns; > + local_irq_disable(); > + now_ns = get_kernel_ns(); > + data = div_u64(now_ns + kvm->arch.kvmclock_offset - > kvm->arch.hv_ref_count,100); > + local_irq_enable(); > + break; > + } > > I do not know if this is right, but I can report that this one is working > without any flaws > since approx. 1.5 years.
Hi Peter, I created this patch based on the original code posted in thread http://marc.info/?l=kvm&m=133278705514826 But please feel free to send your version, if you see any problem in the current code. Best regards, Vadim. > Peter -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
