On 23.05.2013 11:54, Paolo Bonzini wrote:
Il 23/05/2013 08:17, Peter Lieven ha scritto:
On 22.05.2013 23:55, Paolo Bonzini wrote:
Il 22/05/2013 09:32, Vadim Rozenfeld ha scritto:
@@ -1827,6 +1829,29 @@ 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;
+ local_irq_disable();
+ kvm->arch.hv_ref_count = get_kernel_ns();
+ local_irq_enable();
+ break;
local_irq_disable/local_irq_enable not needed.
What is the reasoning behind reading this time value at msr write time?
[VR] Windows writs this MSR only once, during HAL initialization.
So, I decided to treat this call as a partition crate event.
But is it expected by Windows that the reference count starts counting
up from 0 at partition creation time? If you could just use
(get_kernel_ns() + kvm->arch.kvmclock_offset) / 100, it would also be
simpler for migration purposes.
I can just report, that I have used the patch that does it that way and
it works.
What do you mean by "that way"? :)
Ups sorry… I meant the way it was implemented in the old patch (I sent a few
days ago).
@@ -1426,6 +1428,21 @@ static int set_msr_hyperv_pw(struct kvm_
if (__copy_to_user((void *)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 hv_tsc_sequence;
+ gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
+ addr = gfn_to_hva(kvm, gfn);
+ if (kvm_is_error_hva(addr))
+ return 1;
+ hv_tsc_sequence = 0x0; //invalid
+ if (__copy_to_user((void *)addr, (void __user *)
&hv_tsc_sequence, sizeof(hv_tsc_sequence)))
+ return 1;
+ kvm->arch.hv_reference_tsc = data;
break;
}
default:
@@ -1826,6 +1843,17 @@ static int get_msr_hyperv_pw(struct kvm_
case HV_X64_MSR_HYPERCALL:
data = kvm->arch.hv_hypercall;
break;
+ 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;
+ }
+ case HV_X64_MSR_REFERENCE_TSC:
+ data = kvm->arch.hv_reference_tsc;
+ break;
default:
pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
return 1;
Peter
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