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Re: [Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MS
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MSRs |
Date: |
Mon, 11 Sep 2017 11:52:43 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 |
On 07/08/2017 10:56, Ladi Prosek wrote:
> This is the QEMU part of the changes required for nested Hyper-V to read
> timestamps with RDTSC + TSC page. Without exposing the frequency MSRs,
> Windows with the Hyper-V role enabled use the much slower
> HV_X64_MSR_TIME_REF_COUNT (0x40000020) RDMSR to read timestamps.
>
> The new registers are exposed only if the TSC frequency is stable across
> migration and known, as suggested by Paolo.
>
> v1->v2:
> * deleted an extra empty line in patch 1
> * added patch 3 introducing a helper function for the "TSC is stable and
> known" check (David)
>
> Ladi Prosek (4):
> i386/kvm: use a switch statement for MSR detection
> i386/kvm: set tsc_khz before configuring Hyper-V CPUID
> i386/kvm: introduce tsc_is_stable_and_known()
> i386/kvm: advertise Hyper-V frequency MSRs
>
> target/i386/kvm.c | 138
> ++++++++++++++++++++++++++++--------------------------
> 1 file changed, 71 insertions(+), 67 deletions(-)
>
Queued, thanks.
Paolo
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