Re: [PATCH v5 1/6] hw/arm/virt: Add a control for the the highmem PCIe MMIO

[Eric Auger <eric.auger@redhat.com>]

Hi Marc,

On 1/14/22 3:07 PM, Marc Zyngier wrote:
> Just like we can control the enablement of the highmem PCIe ECAM
> region using highmem_ecam, let's add a control for the highmem
> PCIe MMIO  region.
>
> Similarily to highmem_ecam, this region is disabled when highmem
> is off.
>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric
> ---
>  hw/arm/virt-acpi-build.c | 10 ++++------
>  hw/arm/virt.c            |  7 +++++--
>  include/hw/arm/virt.h    |  1 +
>  3 files changed, 10 insertions(+), 8 deletions(-)
>
> diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> index f2514ce77c..449fab0080 100644
> --- a/hw/arm/virt-acpi-build.c
> +++ b/hw/arm/virt-acpi-build.c
> @@ -158,10 +158,9 @@ static void acpi_dsdt_add_virtio(Aml *scope,
>  }
>  
>  static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap,
> -                              uint32_t irq, bool use_highmem, bool highmem_ecam,
> -                              VirtMachineState *vms)
> +                              uint32_t irq, VirtMachineState *vms)
>  {
> -    int ecam_id = VIRT_ECAM_ID(highmem_ecam);
> +    int ecam_id = VIRT_ECAM_ID(vms->highmem_ecam);
>      struct GPEXConfig cfg = {
>          .mmio32 = memmap[VIRT_PCIE_MMIO],
>          .pio    = memmap[VIRT_PCIE_PIO],
> @@ -170,7 +169,7 @@ static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap,
>          .bus    = vms->bus,
>      };
>  
> -    if (use_highmem) {
> +    if (vms->highmem_mmio) {
>          cfg.mmio64 = memmap[VIRT_HIGH_PCIE_MMIO];
>      }
>  
> @@ -869,8 +868,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
>      acpi_dsdt_add_fw_cfg(scope, &memmap[VIRT_FW_CFG]);
>      acpi_dsdt_add_virtio(scope, &memmap[VIRT_MMIO],
>                      (irqmap[VIRT_MMIO] + ARM_SPI_BASE), NUM_VIRTIO_TRANSPORTS);
> -    acpi_dsdt_add_pci(scope, memmap, (irqmap[VIRT_PCIE] + ARM_SPI_BASE),
> -                      vms->highmem, vms->highmem_ecam, vms);
> +    acpi_dsdt_add_pci(scope, memmap, irqmap[VIRT_PCIE] + ARM_SPI_BASE, vms);
>      if (vms->acpi_dev) {
>          build_ged_aml(scope, "\\_SB."GED_DEVICE,
>                        HOTPLUG_HANDLER(vms->acpi_dev),
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index b45b52c90e..ed8ea96acc 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -1412,7 +1412,7 @@ static void create_pcie(VirtMachineState *vms)
>                               mmio_reg, base_mmio, size_mmio);
>      memory_region_add_subregion(get_system_memory(), base_mmio, mmio_alias);
>  
> -    if (vms->highmem) {
> +    if (vms->highmem_mmio) {
>          /* Map high MMIO space */
>          MemoryRegion *high_mmio_alias = g_new0(MemoryRegion, 1);
>  
> @@ -1466,7 +1466,7 @@ static void create_pcie(VirtMachineState *vms)
>      qemu_fdt_setprop_sized_cells(ms->fdt, nodename, "reg",
>                                   2, base_ecam, 2, size_ecam);
>  
> -    if (vms->highmem) {
> +    if (vms->highmem_mmio) {
>          qemu_fdt_setprop_sized_cells(ms->fdt, nodename, "ranges",
>                                       1, FDT_PCI_RANGE_IOPORT, 2, 0,
>                                       2, base_pio, 2, size_pio,
> @@ -2105,6 +2105,8 @@ static void machvirt_init(MachineState *machine)
>  
>      virt_flash_fdt(vms, sysmem, secure_sysmem ?: sysmem);
>  
> +    vms->highmem_mmio &= vms->highmem;
> +
>      create_gic(vms, sysmem);
>  
>      virt_cpu_post_init(vms, sysmem);
> @@ -2802,6 +2804,7 @@ static void virt_instance_init(Object *obj)
>      vms->gic_version = VIRT_GIC_VERSION_NOSEL;
>  
>      vms->highmem_ecam = !vmc->no_highmem_ecam;
> +    vms->highmem_mmio = true;
>  
>      if (vmc->no_its) {
>          vms->its = false;
> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
> index dc6b66ffc8..9c54acd10d 100644
> --- a/include/hw/arm/virt.h
> +++ b/include/hw/arm/virt.h
> @@ -143,6 +143,7 @@ struct VirtMachineState {
>      bool secure;
>      bool highmem;
>      bool highmem_ecam;
> +    bool highmem_mmio;
>      bool its;
>      bool tcg_its;
>      bool virt;