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Re: [Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MS
From: |
Konrad Rzeszutek Wilk |
Subject: |
Re: [Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MSRs |
Date: |
Tue, 15 Aug 2017 21:49:38 -0400 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Tue, Aug 08, 2017 at 09:50:53PM -0300, Marcelo Tosatti wrote:
> On Mon, Aug 07, 2017 at 10:56:59AM +0200, 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(-)
> >
> > --
> > 2.9.3
>
>
> Signed-off-by: Marcelo Tosatti <address@hidden>
Come again please?
>
- [Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MSRs, Ladi Prosek, 2017/08/07
- [Qemu-devel] [PATCH v2 3/4] i386/kvm: introduce tsc_is_stable_and_known(), Ladi Prosek, 2017/08/07
- [Qemu-devel] [PATCH v2 1/4] i386/kvm: use a switch statement for MSR detection, Ladi Prosek, 2017/08/07
- [Qemu-devel] [PATCH v2 2/4] i386/kvm: set tsc_khz before configuring Hyper-V CPUID, Ladi Prosek, 2017/08/07
- [Qemu-devel] [PATCH v2 4/4] i386/kvm: advertise Hyper-V frequency MSRs, Ladi Prosek, 2017/08/07
- Re: [Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MSRs, Marcelo Tosatti, 2017/08/08
- Re: [Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MSRs,
Konrad Rzeszutek Wilk <=