On 09/10/12 14:21, Gleb Natapov wrote:
On Mon, Sep 10, 2012 at 02:15:49PM +0200, Paolo Bonzini wrote:
Il 10/09/2012 13:52, Peter Lieven ha scritto:
dd if=/dev/cpu/0/msr skip=$((0x194)) bs=8 count=1 | xxd
dd if=/dev/cpu/0/msr skip=$((0xCE)) bs=8 count=1 | xxd
it only works without the skip. but the msr device returns all zeroes.
Hmm, the strange API of the MSR device doesn't work well with dd (dd
skips to 0x194 * 8 because bs is 8. You can try this program:
There is rdmsr/wrmsr in msr-tools.
rdmsr returns it cannot read those MSRs. regardless if I use -cpu host
or -cpu qemu64.
peter
#include<fcntl.h>
#include<stdio.h>
#include<stdlib.h>
int rdmsr(int fd, long reg)
{
char msg[40];
long long val;
sprintf(msg, "rdmsr(%#x)", reg);
if (pread(fd,&val, 8, reg)< 0) {
perror(msg);
} else {
printf("%s: %#016llx\n", msg, val);
fflush(stdout);
}
}
int main()
{
int fd = open("/dev/cpu/0/msr", O_RDONLY);
if (fd< 0) { perror("open"); exit(1); }
rdmsr(fd, 0x194);
rdmsr(fd, 0xCE);
}
Paolo
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Gleb.
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