From: "Radim Krčmář" <rkrcmar@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, "Lan,
Tianyu" <tianyu.lan@intel.com>,
Igor Mammedov <imammedo@redhat.com>,
Jan Kiszka <jan.kiszka@web.de>, Peter Xu <peterx@redhat.com>
Subject: Re: [PATCH v1 06/11] KVM: x86: use hardware-compatible format for APIC ID register
Date: Fri, 1 Jul 2016 17:53:50 +0200 [thread overview]
Message-ID: <20160701155349.GB5965@potion> (raw)
In-Reply-To: <0547afff-bb34-53dc-c753-3601a9fb7022@redhat.com>
2016-07-01 17:07+0200, Paolo Bonzini:
> On 01/07/2016 16:54, Radim Krčmář wrote:
>>> > (Hint: we
>>> > want kvm-unit-tests for this).
>> :) Something like this?
>>
>> enable_xapic()
>> id = apic_id()
>> set_apic_id(id+1) // ?
>> enable_x2apic()
>> id == apic_id() & 0xff
>> disable_apic()
>> enable_xapic()
>> id == apic_id()
>>
>
> Yes, plus checking that it "moves" appropriately between low and high bits.
x2APIC cannot use MMIO interface, so apic_id() already does the best we
can ... if KVM is shifting wrong somwhere, then the id should differ.
next prev parent reply other threads:[~2016-07-01 15:53 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-30 20:54 [PATCH v1 00/11] KVM: x86: break the xAPIC barrier Radim Krčmář
2016-06-30 20:54 ` [PATCH v1 01/11] KVM: x86: bump KVM_SOFT_MAX_VCPUS to 240 Radim Krčmář
2016-07-01 8:42 ` Paolo Bonzini
2016-06-30 20:54 ` [PATCH v1 02/11] KVM: x86: add kvm_apic_map_get_dest_lapic Radim Krčmář
2016-07-01 7:57 ` Paolo Bonzini
2016-07-01 12:39 ` Radim Krčmář
2016-06-30 20:54 ` [PATCH v1 03/11] KVM: x86: dynamic kvm_apic_map Radim Krčmář
2016-06-30 22:15 ` Andrew Honig
2016-07-01 8:42 ` Paolo Bonzini
2016-07-01 12:44 ` Radim Krčmář
2016-07-01 14:03 ` Paolo Bonzini
2016-07-01 14:38 ` Radim Krčmář
2016-07-01 15:06 ` Paolo Bonzini
2016-07-01 15:12 ` Paolo Bonzini
2016-07-01 15:43 ` Radim Krčmář
2016-07-01 16:38 ` Paolo Bonzini
2016-07-01 15:35 ` Radim Krčmář
2016-07-01 7:33 ` Paolo Bonzini
2016-06-30 20:54 ` [PATCH v1 04/11] KVM: x86: use u16 for logical VCPU mask in lapic Radim Krčmář
2016-07-01 7:56 ` Paolo Bonzini
2016-07-01 12:48 ` Radim Krčmář
2016-07-01 14:04 ` Paolo Bonzini
2016-06-30 20:54 ` [PATCH v1 05/11] KVM: x86: use generic function for MSI parsing Radim Krčmář
2016-07-01 8:42 ` Paolo Bonzini
2016-06-30 20:54 ` [PATCH v1 06/11] KVM: x86: use hardware-compatible format for APIC ID register Radim Krčmář
2016-07-01 8:33 ` Paolo Bonzini
2016-07-01 13:11 ` Radim Krčmář
2016-07-01 14:12 ` Paolo Bonzini
2016-07-01 14:54 ` Radim Krčmář
2016-07-01 15:07 ` Paolo Bonzini
2016-07-01 15:53 ` Radim Krčmář [this message]
2016-07-01 16:37 ` Paolo Bonzini
2016-06-30 20:54 ` [PATCH v1 07/11] KVM: VMX: optimize APIC ID read with APICv Radim Krčmář
2016-07-01 8:42 ` Paolo Bonzini
2016-06-30 20:54 ` [PATCH v1 08/11] KVM: x86: directly call recalculate_apic_map on lapic restore Radim Krčmář
2016-07-01 8:43 ` Paolo Bonzini
2016-06-30 20:54 ` [PATCH v1 09/11] KVM: x86: reset lapic base in kvm_lapic_reset Radim Krčmář
2016-07-01 8:43 ` Paolo Bonzini
2016-06-30 20:54 ` [PATCH v1 10/11] KVM: x86: add KVM_CAP_X2APIC_API Radim Krčmář
2016-07-01 8:24 ` Paolo Bonzini
2016-07-01 13:25 ` Radim Krčmář
2016-07-01 18:09 ` David Matlack
2016-07-01 18:31 ` Radim Krčmář
2016-06-30 20:54 ` [PATCH v1 11/11] KVM: x86: bump MAX_VCPUS to 288 Radim Krčmář
2016-07-01 8:43 ` Paolo Bonzini
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