From: "Radim Krčmář" <rkrcmar@redhat.com>
To: Eduardo Habkost <ehabkost@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
peterx@redhat.com, Andrew Jones <drjones@redhat.com>,
kvm@vger.kernel.org
Subject: Re: GET_SUPPORTED_CPUID and irqchip (was Re: kvm_pv_unhalt and kernel_irqchip=off)
Date: Mon, 15 Aug 2016 20:32:37 +0200 [thread overview]
Message-ID: <20160815183236.GC12385@potion> (raw)
In-Reply-To: <20160815180023.GR5627@thinpad.lan.raisama.net>
2016-08-15 15:00-0300, Eduardo Habkost:
> On Mon, Aug 15, 2016 at 07:50:59PM +0200, Radim Krčmář wrote:
> [...]
>> +static void kvm_clear_invalid_cpuid(struct kvm_vcpu *vcpu)
>> +{
>> + struct kvm *kvm = vcpu->kvm;
>> + struct kvm_cpuid_entry2 *best;
>> +
>> + if (!kvm->clear_invalid_cpuid)
>> + return;
>> +
>> + best = kvm_find_cpuid_entry(vcpu, 1, 0);
>> + if (best && !lapic_in_kernel(vcpu))
>> + best->ecx &= ~F(X2APIC);
>
> Isn't it possible to implement x2apic support in userspace APIC
> using the current KVM interfaces?
No, MSR accesses never get to userspace. We'll probably implement it in
the future as there already has been a proposal for unhandled MSRs.
prev parent reply other threads:[~2016-08-15 18:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-10 18:27 kvm_pv_unhalt and kernel_irqchip=off Eduardo Habkost
2016-08-10 19:04 ` Radim Krčmář
2016-08-10 20:58 ` Radim Krčmář
2016-08-12 18:37 ` GET_SUPPORTED_CPUID and irqchip (was Re: kvm_pv_unhalt and kernel_irqchip=off) Eduardo Habkost
2016-08-13 12:43 ` Radim Krčmář
2016-08-15 13:03 ` Eduardo Habkost
2016-08-15 13:21 ` Paolo Bonzini
2016-08-15 17:50 ` Radim Krčmář
2016-08-15 18:00 ` Eduardo Habkost
2016-08-15 18:32 ` Radim Krčmář [this message]
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