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Re: [Qemu-devel] [PATCH 0/4] Support more than 255 cpus
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH 0/4] Support more than 255 cpus |
Date: |
Tue, 13 May 2014 12:53:04 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2014-05-13 09:09, Li, Zhen-Hua wrote:
> From: "Li, ZhenHua" <address@hidden>
>
> These series patches are trying to make Qemu support more than 255 CPUs.
> The max cpu number changed to 4096.
>
> Support more than 255 cpus: ACPI and APIC defines
> Support more than 255 cpus: max_cpus to 4096
> Support more than 255 cpus: max cpumask bit to 4096
> Support more than 255 cpus: runtime chec
>
> include/hw/acpi/cpu_hotplug_defs.h | 4 ++--
> include/hw/i386/apic_internal.h | 2 +-
> include/hw/i386/pc.h | 2 +-
> include/sysemu/sysemu.h | 2 +-
> hw/i386/acpi-build.c | 8 ++++----
Don't we need x2APIC support to provide >255 CPUs? Where so you enforce
this, i.e. keep the restriction to 255 CPUs when we are not in KVM mode
with in-kernel APIC (the emulate APIC lacks x2APIC mode, unfortunately)?
But, wait, KVM only supports up to 255 VCPUs. So what are you targeting at?
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
- [Qemu-devel] [PATCH 0/4] Support more than 255 cpus, Li, Zhen-Hua, 2014/05/13
- [Qemu-devel] [PATCH 1/4] Support more than 255 cpus: ACPI and APIC defines, Li, Zhen-Hua, 2014/05/13
- [Qemu-devel] [PATCH 4/4] Support more than 255 cpus: runtime check, Li, Zhen-Hua, 2014/05/13
- [Qemu-devel] [PATCH 3/4] Support more than 255 cpus: max cpumask bit to 4096, Li, Zhen-Hua, 2014/05/13
- [Qemu-devel] [PATCH 2/4] Support more than 255 cpus: max_cpus to 4096, Li, Zhen-Hua, 2014/05/13
- Re: [Qemu-devel] [PATCH 0/4] Support more than 255 cpus, Andreas Färber, 2014/05/13
- Re: [Qemu-devel] [PATCH 0/4] Support more than 255 cpus,
Jan Kiszka <=