[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 2/8] x86/hyperv: detect absolutely necessary MSRs
On 03.01.2020 12:01, Paul Durrant wrote: > On Sun, 29 Dec 2019 at 18:34, Wei Liu <wl@xxxxxxx> wrote: >> --- a/xen/arch/x86/guest/hyperv/hyperv.c >> +++ b/xen/arch/x86/guest/hyperv/hyperv.c >> @@ -32,6 +32,8 @@ static const struct hypervisor_ops ops = { >> const struct hypervisor_ops *__init hyperv_probe(void) >> { >> uint32_t eax, ebx, ecx, edx; >> + uint64_t required_msrs = HV_X64_MSR_HYPERCALL_AVAILABLE | >> + HV_X64_MSR_VP_INDEX_AVAILABLE; >> >> cpuid(0x40000000, &eax, &ebx, &ecx, &edx); >> if ( !((ebx == 0x7263694d) && /* "Micr" */ >> @@ -57,6 +59,15 @@ const struct hypervisor_ops *__init hyperv_probe(void) >> ms_hyperv.max_vp_index = eax; >> ms_hyperv.max_lp_index = ebx; >> >> + if ( (ms_hyperv.features & required_msrs) != required_msrs ) >> + { >> + /* Oops, required MSRs are not available. Treat this as >> + * "Hyper-V is not available". >> + */ > > That block comment violates default coding style. And with it corrected Acked-by: Jan Beulich <jbeulich@xxxxxxxx> Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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