Re: [PATCH v2 2/3] tools: build qemu-vmsr-helper

[Paolo Bonzini]

On 10/31/23 15:46, Anthony Harivel wrote:
> +
> +static uint64_t vmsr_read_msr(uint32_t reg, unsigned int cpu_id)
> +{
> +    int fd;
> +    uint64_t data;
> +
> +    char path[MAX_PATH_LEN];
> +    snprintf(path, MAX_PATH_LEN, "/dev/cpu/%u/msr", cpu_id);

If you allow any CPU here, the thread id is really unused.  You can 
however call sched_getaffinity(), and check that the CPU id is included 
in the thread's affinity.  sched_getaffinity() does not need any extra 
capability.

Paolo