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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [PATCH 2/2] i386/kvm: lower requirements for Hyper-V frequency MSRs exposure |
Date: | Fri, 16 Mar 2018 15:49:30 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 |
On 12/03/2018 16:12, Vitaly Kuznetsov wrote: > > - if (has_msr_hv_frequencies && tsc_is_stable_and_known(env)) { > + if (has_msr_hv_frequencies && env->tsc_khz) { Should this be ((env->tsc_khz && has_msr_hv_reenlightenment) || tsc_is_stable_and_known(env)) so that you don't regress on older kernels? Paolo > env->features[FEAT_HYPERV_EAX] |= HV_ACCESS_FREQUENCY_MSRS; > env->features[FEAT_HYPERV_EDX] |= HV_FREQUENCY_MSRS_AVAILABLE; > }
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