Re: [PATCH v3] virtio-pci: correctly set virtio pci queue mem multiplier

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Hi Srujana,

On 23/2/24 06:26, Srujana Challa wrote:
> Currently, virtio_pci_queue_mem_mult function always returns 4K
> when VIRTIO_PCI_FLAG_PAGE_PER_VQ is set. But this won't
> work for vhost vdpa when host has page size other than 4K.
> This patch introduces a new property(host-page-per-vq) for vdpa
> use case to fix the same.
> 
> Signed-off-by: Srujana Challa <schalla@marvell.com>
> ---
> v2->v3:
> - Modified property name, page-per-vdpa-vq to host-page-per-vq.
> 
> v1->v2:
> - Introduced a new property to get virtqueue mem multiplier for
>    vdpa use case.
> 
>   hw/virtio/virtio-pci.c         | 10 ++++++++--
>   include/hw/virtio/virtio-pci.h |  5 +++++
>   2 files changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index 1a7039fb0c..f29e60830b 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -320,8 +320,12 @@ static bool virtio_pci_ioeventfd_enabled(DeviceState *d)
>   
>   static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy *proxy)
>   {
> -    return (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) ?
> -        QEMU_VIRTIO_PCI_QUEUE_MEM_MULT : 4;
> +    if (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ)
> +        return QEMU_VIRTIO_PCI_QUEUE_MEM_MULT;
> +    else if (proxy->flags & VIRTIO_PCI_FLAG_HOST_PAGE_PER_VQ)
> +        return qemu_real_host_page_size();
> +    else
> +        return 4;
 >   }

Per our coding style, this code should use braces:
https://www.qemu.org/docs/master/devel/style.html#block-structure

Regards,

Phil.