linux-kernel - Re: [PATCH V9 0/2] KVM: x86: Make bus clock frequency for vAPIC timer configurable

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Message-ID: <c622488e-78e4-4f50-b487-52cdd6490e35@intel.com>
Date: Wed, 10 Jul 2024 10:14:44 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Sean Christopherson <seanjc@...gle.com>
CC: <isaku.yamahata@...el.com>, <pbonzini@...hat.com>,
	<erdemaktas@...gle.com>, <vkuznets@...hat.com>, <vannapurve@...gle.com>,
	<jmattson@...gle.com>, <mlevitsk@...hat.com>, <xiaoyao.li@...el.com>,
	<chao.gao@...el.com>, <rick.p.edgecombe@...el.com>, <yuan.yao@...el.com>,
	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V9 0/2] KVM: x86: Make bus clock frequency for vAPIC timer
 configurable



On 7/10/24 8:42 AM, Sean Christopherson wrote:
> On Fri, Jun 28, 2024, Reinette Chatre wrote:

>> Now that the x86 udelay() utility no longer use cpu_relax(), should ARM
>> and RISC-V's udelay() be modified to match in this regard? I can prepare
>> (unable to test) changes for you to consider on your return.
> 
> I don't think so?  IIUC, arm64's "yield", used by cpu_relax() doesn't trigger the
> "on spin" exists.  Such exist are only triggered by "wfet" and friends.

ah, I see, thank you very much Sean.

Reinette