Re: [Qemu-devel] [PATCH 08/11] Goldfish: Added the memory logger device.

[Stefan Hajnoczi <stefanha@gmail.com>]

On Mon, Aug 22, 2011 at 10:39 AM, Patrick Jackson
<patricksjackson@gmail.com> wrote:
> +static void memlog_write(void *opaque, target_phys_addr_t offset, uint32_t
> val)
> +{
> +    static unsigned info[8];

The size should be 2, not 8.

Using a static variable is a bit lazy here.  We're already accessing
GoldfishMemlogDevice so we might as well use a proper per-device
info[] array.

> +    char buf[128];
> +    GoldfishMemlogDevice *s = (GoldfishMemlogDevice *)opaque;
> +    int ret;
> +
> +    (void)s->dev;
> +
> +    if (offset < 8*4)
> +        info[offset / 4] = val;
> +
> +    if (offset == 0) {
> +            /* write PID and VADDR to logfile */
> +        snprintf(buf, sizeof buf, "%08x %08x\n", info[0], info[1]);
> +        do {
> +            ret = write(s->fd, buf, strlen(buf));
> +        } while (ret < 0 && errno == EINTR);
> +    }
> +}
> +
> +
> +static CPUReadMemoryFunc *memlog_readfn[] = {
> +   memlog_read,
> +   memlog_read,
> +   memlog_read
> +};

Do you really need memlog_read?  I would just use NULL read functions.

> +static GoldfishDeviceInfo goldfish_memlog_info = {
> +    .init = goldfish_memlog_init,
> +    .readfn = memlog_readfn,
> +    .writefn = memlog_writefn,
> +    .qdev.name  = "goldfish_memlog",
> +    .qdev.size  = sizeof(GoldfishMemlogDevice),
> +    .qdev.props = (Property[]) {
> +        DEFINE_PROP_UINT32("base", GoldfishDevice, base, 0),
> +        DEFINE_PROP_UINT32("id", GoldfishDevice, id, 0),
> +        DEFINE_PROP_UINT32("size", GoldfishDevice, size, 0x1000),
> +        DEFINE_PROP_UINT32("irq", GoldfishDevice, irq, 0),
> +        DEFINE_PROP_UINT32("irq_count", GoldfishDevice, irq_count, 0),
> +        DEFINE_PROP_STRING("name", GoldfishDevice, name),
> +        DEFINE_PROP_INT32("fd", GoldfishMemlogDevice, fd, -1),

I'm not sure these fields all need to be defined here.  Why make fd a
qdev property?

Stefan