Re: [PATCH 2/2] hw/i386/xen/xen-hvm: Inline xen_piix_pci_write_config_client() and remove it

["Michael S. Tsirkin" <mst@redhat.com>]

On Sun, Jun 26, 2022 at 11:46:56AM +0200, Bernhard Beschow wrote:
> xen_piix_pci_write_config_client() is implemented in the xen sub tree and
> uses PIIX constants internally, thus creating a direct dependency on
> PIIX. Now that xen_set_pci_link_route() is stubbable, the logic of
> xen_piix_pci_write_config_client() can be moved to PIIX which resolves
> the dependency.
> 
> Signed-off-by: Bernhard Beschow <shentey@gmail.com>

Fine by me

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/i386/xen/xen-hvm.c | 18 ------------------
>  hw/isa/piix3.c        | 15 ++++++++++++++-
>  include/hw/xen/xen.h  |  1 -
>  stubs/xen-hw-stub.c   |  4 ----
>  4 files changed, 14 insertions(+), 24 deletions(-)
> 
> diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
> index 204fda7949..e4293d6d66 100644
> --- a/hw/i386/xen/xen-hvm.c
> +++ b/hw/i386/xen/xen-hvm.c
> @@ -15,7 +15,6 @@
>  #include "hw/pci/pci.h"
>  #include "hw/pci/pci_host.h"
>  #include "hw/i386/pc.h"
> -#include "hw/southbridge/piix.h"
>  #include "hw/irq.h"
>  #include "hw/hw.h"
>  #include "hw/i386/apic-msidef.h"
> @@ -149,23 +148,6 @@ void xen_piix3_set_irq(void *opaque, int irq_num, int level)
>                             irq_num & 3, level);
>  }
>  
> -void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
> -{
> -    int i;
> -
> -    /* Scan for updates to PCI link routes (0x60-0x63). */
> -    for (i = 0; i < len; i++) {
> -        uint8_t v = (val >> (8 * i)) & 0xff;
> -        if (v & 0x80) {
> -            v = 0;
> -        }
> -        v &= 0xf;
> -        if (((address + i) >= PIIX_PIRQCA) && ((address + i) <= PIIX_PIRQCD)) {
> -            xen_set_pci_link_route(address + i - PIIX_PIRQCA, v);
> -        }
> -    }
> -}
> -
>  int xen_set_pci_link_route(uint8_t link, uint8_t irq)
>  {
>      return xendevicemodel_set_pci_link_route(xen_dmod, xen_domid, link, irq);
> diff --git a/hw/isa/piix3.c b/hw/isa/piix3.c
> index 6388558f92..48f9ab1096 100644
> --- a/hw/isa/piix3.c
> +++ b/hw/isa/piix3.c
> @@ -138,7 +138,20 @@ static void piix3_write_config(PCIDevice *dev,
>  static void piix3_write_config_xen(PCIDevice *dev,
>                                     uint32_t address, uint32_t val, int len)
>  {
> -    xen_piix_pci_write_config_client(address, val, len);
> +    int i;
> +
> +    /* Scan for updates to PCI link routes (0x60-0x63). */
> +    for (i = 0; i < len; i++) {
> +        uint8_t v = (val >> (8 * i)) & 0xff;
> +        if (v & 0x80) {
> +            v = 0;
> +        }
> +        v &= 0xf;
> +        if (((address + i) >= PIIX_PIRQCA) && ((address + i) <= PIIX_PIRQCD)) {
> +            xen_set_pci_link_route(address + i - PIIX_PIRQCA, v);
> +        }
> +    }
> +
>      piix3_write_config(dev, address, val, len);
>  }
>  
> diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
> index 13bffaef53..afdf9c436a 100644
> --- a/include/hw/xen/xen.h
> +++ b/include/hw/xen/xen.h
> @@ -23,7 +23,6 @@ extern bool xen_domid_restrict;
>  int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num);
>  int xen_set_pci_link_route(uint8_t link, uint8_t irq);
>  void xen_piix3_set_irq(void *opaque, int irq_num, int level);
> -void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len);
>  void xen_hvm_inject_msi(uint64_t addr, uint32_t data);
>  int xen_is_pirq_msi(uint32_t msi_data);
>  
> diff --git a/stubs/xen-hw-stub.c b/stubs/xen-hw-stub.c
> index 743967623f..34a22f2ad7 100644
> --- a/stubs/xen-hw-stub.c
> +++ b/stubs/xen-hw-stub.c
> @@ -19,10 +19,6 @@ void xen_piix3_set_irq(void *opaque, int irq_num, int level)
>  {
>  }
>  
> -void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
> -{
> -}
> -
>  int xen_set_pci_link_route(uint8_t link, uint8_t irq)
>  {
>      return -1;
> -- 
> 2.36.1