From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: kvm-tools: can't seem to set guest_mac and KVM_GET_SUPPORTED_CPUID
 failed.
Date: Thu, 17 Nov 2011 18:49:16 +0200
Message-ID: <4EC53B0C.4090300@redhat.com>
References: <1321510055.4221.5.camel@lappy> <CAOJsxLFb7pGQryfYrBxGfkj_T1PQwakEA3kN1WLuC6i_JiJLzQ@mail.gmail.com> <1321512998.4221.7.camel@lappy> <20111117153833.GA5915@dancer.ca.sandia.gov> <1321544629.8010.9.camel@lappy> <20111117155000.GB5915@dancer.ca.sandia.gov> <1321545120.8010.10.camel@lappy> <4EC52E0E.1000502@redhat.com> <20111117161200.GB25489@dancer.ca.sandia.gov> <4EC53451.5070209@redhat.com> <20111117162959.GC25489@dancer.ca.sandia.gov>
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Cc: Sasha Levin <levinsasha928@gmail.com>,
	Pekka Enberg <penberg@kernel.org>, kvm@vger.kernel.org
To: David Evensky <evensky@dancer.ca.sandia.gov>
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On 11/17/2011 06:29 PM, David Evensky wrote:
> Avi,
>
> evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x01 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
> KVM_GET_SUPPORTED_CPUID returned -1 with errno 7: 3
> Returned entries: 31: 9995
> Returned entries: 32: 1
> Returned entries: 64: 1
> evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x02 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
> KVM_GET_SUPPORTED_CPUID returned -1 with errno 7: 1
> Returned entries: 31: 9999
> evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x03 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
> KVM_GET_SUPPORTED_CPUID returned -1 with errno 7: 3
> Returned entries: 31: 9995
> Returned entries: 57: 1
> Returned entries: 58: 1
> evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x04 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
> Returned entries: 31: 10000
> evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x08 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
> KVM_GET_SUPPORTED_CPUID returned -1 with errno 7: 1
> Returned entries: 31: 9998
> Returned entries: 54: 1
>

Please run the attached program (which works for me, btw). 

-- 
error compiling committee.c: too many arguments to function


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#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <linux/kvm.h>

int main(void)
{
    struct kvm_cpuid2 *cpuid;
    int kvm, r = 0, i, j;

    for (i = 0; i < 1000000; ++i) {
        kvm = open("/dev/kvm", O_RDWR);
        cpuid = malloc(sizeof(*cpuid) + sizeof(struct kvm_cpuid_entry2) * 100);
        cpuid->nent = 100;

        r = ioctl(kvm, KVM_GET_SUPPORTED_CPUID, cpuid);
        if (r)
            printf("KVM_GET_SUPPORTED_CPUID returned %d with errno %d\n", r, errno);
        else if (cpuid->nent > 31) {
            printf("Returned entries: %d\n", cpuid->nent);
            for (j = 0; j < cpuid->nent; ++j) {
                struct kvm_cpuid_entry2 *e = &cpuid->entries[j];

                printf("func %08x ind %08x flags %08x -> %08x %08x %08x %08x\n",
                       e->function, e->index, e->flags,
                       e->eax, e->ebx, e->ecx, e->edx);
	    }
            return 1;
        }

	free(cpuid);
	close(kvm);
    }

    return 0;
}

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