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x86/viridian: Time Reference Count MSR
This viridian MSR is a read-only source of time (in units of 100ns) since the domain started. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
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Paul Durrant authored and 
Jan Beulich committed
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@@ -17,13 +17,14 @@
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#include <public/hvm/hvm_op.h>
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/* Viridian MSR numbers. */
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#define VIRIDIAN_MSR_GUEST_OS_ID 0x40000000
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#define VIRIDIAN_MSR_HYPERCALL 0x40000001
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#define VIRIDIAN_MSR_VP_INDEX 0x40000002
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#define VIRIDIAN_MSR_EOI 0x40000070
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#define VIRIDIAN_MSR_ICR 0x40000071
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#define VIRIDIAN_MSR_TPR 0x40000072
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#define VIRIDIAN_MSR_APIC_ASSIST 0x40000073
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#define VIRIDIAN_MSR_GUEST_OS_ID 0x40000000
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#define VIRIDIAN_MSR_HYPERCALL 0x40000001
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#define VIRIDIAN_MSR_VP_INDEX 0x40000002
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#define VIRIDIAN_MSR_TIME_REF_COUNT 0x40000020
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#define VIRIDIAN_MSR_EOI 0x40000070
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#define VIRIDIAN_MSR_ICR 0x40000071
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#define VIRIDIAN_MSR_TPR 0x40000072
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#define VIRIDIAN_MSR_APIC_ASSIST 0x40000073
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/* Viridian Hypercall Status Codes. */
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#define HV_STATUS_SUCCESS 0x0000
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@@ -33,6 +34,7 @@
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#define HvNotifyLongSpinWait 8
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/* Viridian CPUID 4000003, Viridian MSR availability. */
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#define CPUID3A_MSR_REF_COUNT (1 << 1)
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#define CPUID3A_MSR_APIC_ACCESS (1 << 4)
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#define CPUID3A_MSR_HYPERCALL (1 << 5)
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#define CPUID3A_MSR_VP_INDEX (1 << 6)
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@@ -83,7 +85,8 @@ int cpuid_viridian_leaves(unsigned int leaf, unsigned int *eax,
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break;
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case 3:
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/* Which hypervisor MSRs are available to the guest */
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*eax = (CPUID3A_MSR_APIC_ACCESS |
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*eax = (CPUID3A_MSR_REF_COUNT |
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CPUID3A_MSR_APIC_ACCESS |
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CPUID3A_MSR_HYPERCALL |
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CPUID3A_MSR_VP_INDEX);
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break;
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@@ -305,6 +308,11 @@ int rdmsr_viridian_regs(uint32_t idx, uint64_t *val)
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*val = v->vcpu_id;
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break;
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case VIRIDIAN_MSR_TIME_REF_COUNT:
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perfc_incr(mshv_rdmsr_time_ref_count);
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*val = hvm_get_guest_time(v) / 100;
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break;
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case VIRIDIAN_MSR_ICR:
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perfc_incr(mshv_rdmsr_icr);
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*val = (((uint64_t)vlapic_get_reg(vcpu_vlapic(v), APIC_ICR2) << 32) |
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@@ -118,6 +118,7 @@ PERFCOUNTER(mshv_call_long_wait, "MS Hv Notify long wait")
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PERFCOUNTER(mshv_rdmsr_osid, "MS Hv rdmsr Guest OS ID")
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PERFCOUNTER(mshv_rdmsr_hc_page, "MS Hv rdmsr hypercall page")
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PERFCOUNTER(mshv_rdmsr_vp_index, "MS Hv rdmsr vp index")
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PERFCOUNTER(mshv_rdmsr_time_ref_count, "MS Hv rdmsr time reference count")
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PERFCOUNTER(mshv_rdmsr_icr, "MS Hv rdmsr icr")
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PERFCOUNTER(mshv_rdmsr_tpr, "MS Hv rdmsr tpr")
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PERFCOUNTER(mshv_rdmsr_apic_assist, "MS Hv rdmsr APIC assist")
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