linux-kernel - Re: [PATCH] Implement missing x86_64 function smp_call_function

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Date:	Thu, 23 Aug 2007 11:34:45 +0200
From:	Laurent Vivier <Laurent.Vivier@...l.net>
To:	Andi Kleen <ak@...e.de>
Cc:	discuss@...-64.org, linux-kernel <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...ranet.com>
Subject: Re: [PATCH] Implement missing x86_64 function smp_call_function_mask()

Andi Kleen wrote:
> On Thursday 23 August 2007 09:36:05 Laurent Vivier wrote:
>> This patch defines the missing function smp_call_function_mask() for x86_64,
>> this is more or less a cut&paste of i386 function.
> 
> What do you need it for?

Hi Andi,

it is for KVM:

drivers/kvm/kvm_main.c:

 203 void kvm_flush_remote_tlbs(struct kvm *kvm)
 204 {
...
 227         /*
 228          * We really want smp_call_function_mask() here.  But that's not
 229          * available, so ipi all cpus in parallel and wait for them
 230          * to complete.
 231          */
 232         for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus))
 233                 smp_call_function_single(cpu, ack_flush, &completed, 1, 0);
 234         while (atomic_read(&completed) != needed) {
 235                 cpu_relax();
 236                 barrier();
 237         }
 238 }

Regards,
Laurent
-- 
------------- Laurent.Vivier@...l.net  --------------
          "Software is hard" - Donald Knuth


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