Re: [PATCH v3 04/15] target/arm: ensure KVM traps set appropriate MemTxAttrs

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

On 27/9/22 16:14, Alex Bennée wrote:
> Although most KVM users will use the in-kernel GIC emulation it is
> perfectly possible not to. In this case we need to ensure the
> MemTxAttrs are correctly populated so the GIC can divine the source
> CPU of the operation.
> 
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> 
> ---
> v3
>    - new for v3
> ---
>   target/arm/kvm.c | 12 ++++++++----
>   1 file changed, 8 insertions(+), 4 deletions(-)

>   void kvm_arm_vm_state_change(void *opaque, bool running, RunState state)
> @@ -1003,6 +1004,10 @@ int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
>       hwaddr xlat, len, doorbell_gpa;
>       MemoryRegionSection mrs;
>       MemoryRegion *mr;
> +    MemTxAttrs attrs = {
> +        .requester_type = MTRT_PCI,
> +        .requester_id = pci_requester_id(dev)
> +    };

Can we add a MEMTXATTRS_PCI() macro similar to MEMTXATTRS_CPU()?

   #define MEMTXATTRS_PCI(pci_dev) ((MemTxAttrs) \
                             {.requester_type = MTRT_PCI, \
                              .requester_id = pci_requester_id(pci_dev)})

So here we can use:

   MemTxAttrs attrs = MEMTXATTRS_PCI(dev);

> @@ -1012,8 +1017,7 @@ int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
>   
>       RCU_READ_LOCK_GUARD();
>   
> -    mr = address_space_translate(as, address, &xlat, &len, true,
> -                                 MEMTXATTRS_UNSPECIFIED);
> +    mr = address_space_translate(as, address, &xlat, &len, true, attrs);
>   
>       if (!mr) {
>           return 1;

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>