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SubjectRe: [PATCH v2 0/7] x86/kvm/hyperv: stable clocksorce for L2 guests when running nested KVM on Hyper-V
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On 13/12/2017 16:09, Vitaly Kuznetsov wrote:
> Currently, KVM passes PVCLOCK_TSC_STABLE_BIT to its guests when running in
> so called 'masterclock' mode and this is only possible when the clocksource
> on the host is TSC. When running nested on Hyper-V we're using a different
> clocksource in L1 (Hyper-V TSC Page) which can actually be used for
> masterclock. This series brings the required support.
>
> Making KVM work with TSC page clocksource is relatively easy, it is done in
> PATCH 5 of the series. All the rest is required to support L1 migration
^^^^^^^

Patch 6. :)

> when TSC frequency changes, we use a special feature from Hyper-V to do
> the job.

Patches 5-7 are

Acked-by: Paolo Bonzini <pbonzini@redhat.com>

I would appreciate if the Hyper-V folks can provide a topic branch to be
merged in both HV and KVM trees.

Thanks,

Paolo

> Vitaly Kuznetsov (7):
> x86/hyper-v: check for required priviliges in hyperv_init()
> x86/hyper-v: add a function to read both TSC and TSC page value
> simulateneously
> x86/hyper-v: reenlightenment notifications support
> x86/hyper-v: redirect reenlightment notifications on CPU offlining
> x86/irq: Count Hyper-V reenlightenment interrupts
> x86/kvm: pass stable clocksource to guests when running nested on
> Hyper-V
> x86/kvm: support Hyper-V reenlightenment
>
> arch/x86/entry/entry_32.S | 3 +
> arch/x86/entry/entry_64.S | 3 +
> arch/x86/hyperv/hv_init.c | 133 ++++++++++++++++++++++++++++++++++-
> arch/x86/include/asm/hardirq.h | 3 +
> arch/x86/include/asm/irq_vectors.h | 7 +-
> arch/x86/include/asm/mshyperv.h | 32 +++++++--
> arch/x86/include/uapi/asm/hyperv.h | 27 ++++++++
> arch/x86/kernel/cpu/mshyperv.c | 6 ++
> arch/x86/kernel/irq.c | 9 +++
> arch/x86/kvm/x86.c | 138 ++++++++++++++++++++++++++++++-------
> 10 files changed, 329 insertions(+), 32 deletions(-)
>

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