Re: [Qemu-devel] [PATCH v4 42/47] ivshmem: use strtosz()

["Marc-André Lureau" <mlureau@redhat.com>]

----- Original Message -----
> On 24.09.2015 13:37, marcandre.lureau@redhat.com wrote:
> > From: Marc-André Lureau <marcandre.lureau@redhat.com>
> > 
> > Use the common qemu utility function to parse the memory size.
> > 
> > Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> > ---
> >  hw/misc/ivshmem.c | 36 +++++-------------------------------
> >  1 file changed, 5 insertions(+), 31 deletions(-)
> > 
> > diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
> > index 273db36..0ee61d5 100644
> > --- a/hw/misc/ivshmem.c
> > +++ b/hw/misc/ivshmem.c
> > @@ -646,33 +646,6 @@ static void ivshmem_reset(DeviceState *d)
> >      ivshmem_use_msix(s);
> >  }
> >  
> > -static uint64_t ivshmem_get_size(IVShmemState * s, Error **errp) {
> > -
> > -    uint64_t value;
> > -    char *ptr;
> > -
> > -    value = strtoull(s->sizearg, &ptr, 10);
> > -    switch (*ptr) {
> > -        case 0: case 'M': case 'm':
> > -            value <<= 20;
> > -            break;
> > -        case 'G': case 'g':
> > -            value <<= 30;
> > -            break;
> > -        default:
> > -            error_setg(errp, "invalid ram size: %s", s->sizearg);
> > -            return 0;
> > -    }
> > -
> > -    /* BARs must be a power of 2 */
> > -    if (!is_power_of_2(value)) {
> > -        error_setg(errp, "size must be power of 2");
> > -        return 0;
> > -    }
> > -
> > -    return value;
> > -}
> > -
> >  static int ivshmem_setup_msi(IVShmemState * s)
> >  {
> >      if (msix_init_exclusive_bar(PCI_DEVICE(s), s->vectors, 1)) {
> > @@ -700,16 +673,17 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error
> > **errp)
> >      uint8_t *pci_conf;
> >      uint8_t attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
> >          PCI_BASE_ADDRESS_MEM_PREFETCH;
> > -    Error *local_err = NULL;
> >  
> >      if (s->sizearg == NULL) {
> >          s->ivshmem_size = 4 << 20; /* 4 MB default */
> >      } else {
> > -        s->ivshmem_size = ivshmem_get_size(s, &local_err);
> > -        if (local_err) {
> > -            error_propagate(errp, local_err);
> > +        char *end;
> > +        int64_t size = strtosz(s->sizearg, &end);
> > +        if (size < 0 || *end != '\0') {
> 
> If there is additional validation that you need to do (in light of your
> comments to this patch),
> it could be done here instead of failing later.

It will duplicate the check done by pci bar code, but I agree it could be done here too. I'll add it.

> 
> > +            error_setg(errp, "Invalid size %s", s->sizearg);
> >              return;
> >          }
> > +        s->ivshmem_size = size;
> >      }
> >  
> >      fifo8_create(&s->incoming_fifo, sizeof(long));
> > 
> 
> 
>