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Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host |
Date: |
Mon, 10 Sep 2012 14:15:49 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0 |
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:
#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
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Avi Kivity, 2012/09/06
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Peter Lieven, 2012/09/10
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Paolo Bonzini, 2012/09/10
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Peter Lieven, 2012/09/10
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Peter Lieven, 2012/09/10
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host,
Paolo Bonzini <=
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Gleb Natapov, 2012/09/10
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Peter Lieven, 2012/09/10
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Avi Kivity, 2012/09/10
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Peter Lieven, 2012/09/10
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Peter Lieven, 2012/09/13
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Paolo Bonzini, 2012/09/13
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Gleb Natapov, 2012/09/13
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Paolo Bonzini, 2012/09/13
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Gleb Natapov, 2012/09/13
- Re: [Qemu-devel] memtest 4.20+ does not work with -cpu host, Peter Lieven, 2012/09/13