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[Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V fre
From: |
Vitaly Kuznetsov |
Subject: |
[Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure |
Date: |
Tue, 20 Mar 2018 18:35:00 +0100 |
Requiring tsc_is_stable_and_known() is too restrictive: even without INVTCS
nested Hyper-V-on-KVM enables TSC pages for its guests e.g. when
Reenlightenment MSRs are present. Presence of frequency MSRs doesn't mean
these frequencies are stable, it just means they're available for reading.
Signed-off-by: Vitaly Kuznetsov <address@hidden>
---
target/i386/kvm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index 7d9f9ca0b1..74fc3d3b2c 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -651,7 +651,7 @@ static int hyperv_handle_properties(CPUState *cs)
env->features[FEAT_HYPERV_EAX] |= HV_TIME_REF_COUNT_AVAILABLE;
env->features[FEAT_HYPERV_EAX] |= HV_REFERENCE_TSC_AVAILABLE;
- if (has_msr_hv_frequencies && tsc_is_stable_and_known(env)) {
+ if (has_msr_hv_frequencies && env->tsc_khz) {
env->features[FEAT_HYPERV_EAX] |= HV_ACCESS_FREQUENCY_MSRS;
env->features[FEAT_HYPERV_EDX] |= HV_FREQUENCY_MSRS_AVAILABLE;
}
--
2.14.3
- [Qemu-devel] [PATCH v3 0/2] i386/kvm: TSC page clocksource for Hyper-V-on-KVM fixes, Vitaly Kuznetsov, 2018/03/20
- [Qemu-devel] [PATCH v3 1/2] i386/kvm: add support for Hyper-V reenlightenment MSRs, Vitaly Kuznetsov, 2018/03/20
- [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure,
Vitaly Kuznetsov <=
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Roman Kagan, 2018/03/21
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Vitaly Kuznetsov, 2018/03/21
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Roman Kagan, 2018/03/21
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Eduardo Habkost, 2018/03/21
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Roman Kagan, 2018/03/22
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Eduardo Habkost, 2018/03/22
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Roman Kagan, 2018/03/22
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Eduardo Habkost, 2018/03/22
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Roman Kagan, 2018/03/23
- Re: [Qemu-devel] [PATCH v3 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure, Eduardo Habkost, 2018/03/23