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Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352 |
Date: |
Fri, 11 Aug 2017 08:51:14 -0300 |
User-agent: |
Mutt/1.8.0 (2017-02-23) |
On Thu, Aug 10, 2017 at 02:08:38PM -0400, Konrad Rzeszutek Wilk wrote:
> On Wed, Aug 09, 2017 at 11:58:20PM -0400, Lan Tianyu wrote:
> > Intel Xeon phi chip will support 352 logical threads. For HPC
> > usage case, it will create a huge VM with vcpus number as same as host
> > cpus. This patch is to increase max vcpu number to 352.
>
> There is this ioctl called KVM_CAP_MAX_VCPUS. Why not use that?
>
> Oh wait, this is generic code. Perhaps there is a way to make
> this more abstract? Where this information is provided via
> an function to which various accelerators register?
We already check KVM_CAP_MAX_VCPUS, see kvm-all.c:kvm_init().
MachineClass::max_cpus is a limit defined at compile time, based
on the limitations of the existing QEMU machine/device code.
--
Eduardo
- [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352, Lan Tianyu, 2017/08/10
- [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352, Lan Tianyu, 2017/08/10
- Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352, Daniel P. Berrange, 2017/08/10
- Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352, Lan Tianyu, 2017/08/10
- Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352, Radim Krčmář, 2017/08/10
- Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352, Eduardo Habkost, 2017/08/10
- Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352, Radim Krčmář, 2017/08/10
- Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352, Lan Tianyu, 2017/08/11
Re: [Qemu-devel] [PATCH] x86: Increase max vcpu number to 352, Paolo Bonzini, 2017/08/10