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[Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MSRs
From: |
Ladi Prosek |
Subject: |
[Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MSRs |
Date: |
Mon, 7 Aug 2017 10:56:59 +0200 |
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
- [Qemu-devel] [PATCH v2 0/4] i386/kvm: advertise Hyper-V frequency MSRs,
Ladi Prosek <=
- [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