* KVM_GET_SUPPORTED_CPUID returning -E2BIG
@ 2011-05-08 5:15 Sasha Levin
2011-05-08 8:56 ` Avi Kivity
0 siblings, 1 reply; 2+ messages in thread
From: Sasha Levin @ 2011-05-08 5:15 UTC (permalink / raw)
To: kvm; +Cc: Ingo Molnar, Pekka Enberg, Cyrill Gorcunov, Asias He,
Prasad Joshi
Hello,
I'm seeing a case where KVM tools occasionally fails with the following
error message: "KVM_GET_SUPPORTED_CPUID failed: Argument list too long",
which means that we get -E2BIG back from KVM_GET_SUPPORTED_CPUID.
Why would it happen if we pass KVM_MAX_CPUID_ENTRIES as the max number
of entries (in the nent field of struct kvm_cpuid2)?
Also, Why would it happen randomly and not each time the code is run?
--
Sasha.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: KVM_GET_SUPPORTED_CPUID returning -E2BIG
2011-05-08 5:15 KVM_GET_SUPPORTED_CPUID returning -E2BIG Sasha Levin
@ 2011-05-08 8:56 ` Avi Kivity
0 siblings, 0 replies; 2+ messages in thread
From: Avi Kivity @ 2011-05-08 8:56 UTC (permalink / raw)
To: Sasha Levin
Cc: kvm, Ingo Molnar, Pekka Enberg, Cyrill Gorcunov, Asias He,
Prasad Joshi
On 05/08/2011 08:15 AM, Sasha Levin wrote:
> Hello,
>
> I'm seeing a case where KVM tools occasionally fails with the following
> error message: "KVM_GET_SUPPORTED_CPUID failed: Argument list too long",
> which means that we get -E2BIG back from KVM_GET_SUPPORTED_CPUID.
>
> Why would it happen if we pass KVM_MAX_CPUID_ENTRIES as the max number
> of entries (in the nent field of struct kvm_cpuid2)?
KVM_MAX_CPUID_ENTRIES is a private define, not exported to userspace
(since it can change).
> Also, Why would it happen randomly and not each time the code is run?
Probably you have some bug. E2BIG is returned when nent is smaller than
the number of entries returned (which only depends on the host cpu type).
--
error compiling committee.c: too many arguments to function
^ permalink raw reply [flat|nested] 2+ messages in thread
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