Signed-off: Peter Lieven <[email protected]>
Signed-off: Gleb Natapov <[email protected]>
Signed-off: Vadim Rozenfeld <[email protected]>
v1 -> v2
1. mark TSC page dirty as suggested by
Eric Northup <[email protected]> and Gleb
2. disable local irq when calling get_kernel_ns,
as it was done by Peter Lieven <[email protected]>
3. move check for TSC page enable from second patch
to this one.
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/include/uapi/asm/hyperv.h | 13 +++++++++++++
arch/x86/kvm/x86.c | 39 +++++++++++++++++++++++++++++++++++++-
include/uapi/linux/kvm.h | 1 +
4 files changed, 54 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index ae5d783..2fd0753 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -605,6 +605,8 @@ 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 b8f1c01..462efe7 100644
--- a/arch/x86/include/uapi/asm/hyperv.h
+++ b/arch/x86/include/uapi/asm/hyperv.h
@@ -28,6 +28,9 @@
/* Partition Reference Counter (HV_X64_MSR_TIME_REF_COUNT) available*/
#define HV_X64_MSR_TIME_REF_COUNT_AVAILABLE (1 << 1)
+/* A partition's reference time stamp counter (TSC) page */
+#define HV_X64_MSR_REFERENCE_TSC 0x40000021
+
/*
* There is a single feature flag that signifies the presence of the MSR
* that can be used to retrieve both the local APIC Timer frequency as
@@ -198,6 +201,9 @@
#define HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_MASK \
(~((1ull << HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT) - 1))
+#define HV_X64_MSR_TSC_REFERENCE_ENABLE 0x00000001
+#define HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT 12
+
#define HV_PROCESSOR_POWER_STATE_C0 0
#define HV_PROCESSOR_POWER_STATE_C1 1
#define HV_PROCESSOR_POWER_STATE_C2 2
@@ -210,4 +216,11 @@
#define HV_STATUS_INVALID_ALIGNMENT 4
#define HV_STATUS_INSUFFICIENT_BUFFERS 19
+typedef struct _HV_REFERENCE_TSC_PAGE {
+ __u32 tsc_sequence;
+ __u32 res1;
+ __u64 tsc_scale;
+ __s64 tsc_offset;
+} HV_REFERENCE_TSC_PAGE, *PHV_REFERENCE_TSC_PAGE;
+
#endif
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 21ef1ba..5e4e495a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -840,7 +840,7 @@ 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,
@@ -1826,6 +1826,8 @@ 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;
}
@@ -1865,6 +1867,29 @@ 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() +
kvm->arch.kvmclock_offset;
+ local_irq_enable();
+ break;
+ }
+ case HV_X64_MSR_REFERENCE_TSC: {
+ u64 gfn;
+ unsigned long addr;
+ HV_REFERENCE_TSC_PAGE tsc_ref;
+ tsc_ref.tsc_sequence = 0;
+ if (!(data & HV_X64_MSR_TSC_REFERENCE_ENABLE)) {
+ kvm->arch.hv_tsc_page = data;
+ break;
+ }
+ gfn = data >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
+ addr = gfn_to_hva(kvm, data >>
+ HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT);
+ if (kvm_is_error_hva(addr))
+ return 1;
+ if (__copy_to_user((void __user *)addr, &tsc_ref,
sizeof(tsc_ref)))
+ return 1;
+ mark_page_dirty(kvm, gfn);
+ kvm->arch.hv_tsc_page = data;
break;
}
default:
@@ -2291,6 +2316,17 @@ 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: {
+ u64 now_ns;
+ local_irq_disable();
+ now_ns = get_kernel_ns() + kvm->arch.kvmclock_offset;
+ data = div_u64(now_ns - kvm->arch.hv_ref_count, 100);
+ local_irq_enable();
+ 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;
@@ -2605,6 +2641,7 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_ASSIGN_DEV_IRQ:
case KVM_CAP_PCI_2_3:
#endif
+ case KVM_CAP_HYPERV_TIME:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 902f124..686c1ca 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -674,6 +674,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_ARM_EL1_32BIT 93
#define KVM_CAP_SPAPR_MULTITCE 94
#define KVM_CAP_EXT_EMUL_CPUID 95
+#define KVM_CAP_HYPERV_TIME 96
#ifdef KVM_CAP_IRQ_ROUTING
--
1.8.1.4
--
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