Re: [PATCH v2 2/9] pci-host: add pcie-msi read method

[Li Qiang]

P J P <ppandit@redhat.com> 于2020年6月25日周四 上午2:59写道：

>
> From: Prasad J Pandit <pjp@fedoraproject.org>
>
> Add pcie-msi mmio read method to avoid NULL pointer dereference
> issue.
>
> Reported-by: Lei Sun <slei.casper@gmail.com>
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>

Reviewed-by: Li Qiang <liq3ea@gmail.com>

> ---
>  hw/pci-host/designware.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/hw/pci-host/designware.c b/hw/pci-host/designware.c
> index 8492c18991..82262bdfdf 100644
> --- a/hw/pci-host/designware.c
> +++ b/hw/pci-host/designware.c
> @@ -21,6 +21,7 @@
>  #include "qemu/osdep.h"
>  #include "qapi/error.h"
>  #include "qemu/module.h"
> +#include "qemu/log.h"
>  #include "hw/pci/msi.h"
>  #include "hw/pci/pci_bridge.h"
>  #include "hw/pci/pci_host.h"
> @@ -63,6 +64,13 @@ designware_pcie_root_to_host(DesignwarePCIERoot *root)
>      return DESIGNWARE_PCIE_HOST(bus->parent);
>  }
>
> +static uint64_t designware_pcie_root_msi_read(void *opaque, hwaddr addr,
> +                                              unsigned size)
> +{
> +    qemu_log_mask(LOG_UNIMP, "%s not implemented\n", __func__);
> +    return 0;
> +}
> +
>  static void designware_pcie_root_msi_write(void *opaque, hwaddr addr,
>                                             uint64_t val, unsigned len)
>  {
> @@ -77,6 +85,7 @@ static void designware_pcie_root_msi_write(void *opaque, 
> hwaddr addr,
>  }
>
>  static const MemoryRegionOps designware_pci_host_msi_ops = {
> +    .read = designware_pcie_root_msi_read,
>      .write = designware_pcie_root_msi_write,
>      .endianness = DEVICE_LITTLE_ENDIAN,
>      .valid = {
> --
> 2.26.2
>