If a source device is connected to the IOPMP device, its memory
transaction will be checked by the IOPMP rule.
When using RISC-V virt machine option "iopmp=on", the generic PCIe host
bridge connects to IOPMP. The PCI devices on the bridge will connect to
IOPMP with default source id(SID) from PCI BDF.
- Add 'iopmp=on' option to add an iopmp device. It checks dma
operations from the generic PCIe host bridge. This option is assumed
to be "off"
- Add 'iopmp_cascade=on' option to add second iopmp device which is
cascaded by first iopmp device to machine. When iopmp option is "off"
, this option has no effect.
Signed-off-by: Ethan Chen <ethan84@andestech.com>
---
docs/system/riscv/virt.rst | 12 ++++
hw/riscv/Kconfig | 1 +
hw/riscv/virt.c | 110 ++++++++++++++++++++++++++++++++++++-
include/hw/riscv/virt.h | 8 ++-
4 files changed, 128 insertions(+), 3 deletions(-)
diff --git a/docs/system/riscv/virt.rst b/docs/system/riscv/virt.rst
index 9a06f95a34..ffcbe3a562 100644
--- a/docs/system/riscv/virt.rst
+++ b/docs/system/riscv/virt.rst
@@ -116,6 +116,18 @@ The following machine-specific options are supported:
having AIA IMSIC (i.e. "aia=aplic-imsic" selected). When not specified,
the default number of per-HART VS-level AIA IMSIC pages is 0.
+- iopmp=[on|off]
+
+ When this option is "on", an IOPMP device is added to machine. It checks dma
+ operations from the generic PCIe host bridge. This option is assumed to be
+ "off".
+
+- iopmp_cascade=[on|off]
+
+ When this option is "on", a second IOPMP device which is cascaded by first
+ IOPMP device is added to machine. When IOPMP option is "off", this option has
+ no effect. This option is assumed to be "off".
+
Running Linux kernel
--------------------
diff --git a/hw/riscv/Kconfig b/hw/riscv/Kconfig
index a50717be87..c207b94747 100644
--- a/hw/riscv/Kconfig
+++ b/hw/riscv/Kconfig
@@ -46,6 +46,7 @@ config RISCV_VIRT
select PLATFORM_BUS
select ACPI
select ACPI_PCI
+ select RISCV_IOPMP
config SHAKTI_C
bool
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index f9fd1341fc..9a3afca8d7 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -52,6 +52,7 @@
#include "hw/display/ramfb.h"
#include "hw/acpi/aml-build.h"
#include "qapi/qapi-visit-common.h"
+#include "hw/misc/riscv_iopmp.h"
/* KVM AIA only supports APLIC MSI. APLIC Wired is always emulated by QEMU. */
static bool virt_use_kvm_aia(RISCVVirtState *s)
@@ -74,6 +75,8 @@ static const MemMapEntry virt_memmap[] = {
[VIRT_UART0] = { 0x10000000, 0x100 },
[VIRT_VIRTIO] = { 0x10001000, 0x1000 },
[VIRT_FW_CFG] = { 0x10100000, 0x18 },
+ [VIRT_IOPMP] = { 0x10200000, 0x100000 },
+ [VIRT_IOPMP2] = { 0x10300000, 0x100000 },
[VIRT_FLASH] = { 0x20000000, 0x4000000 },
[VIRT_IMSIC_M] = { 0x24000000, VIRT_IMSIC_MAX_SIZE },
[VIRT_IMSIC_S] = { 0x28000000, VIRT_IMSIC_MAX_SIZE },
@@ -1011,6 +1014,42 @@ static void create_fdt_fw_cfg(RISCVVirtState *s, const MemMapEntry *memmap)
g_free(nodename);
}
+static void create_fdt_iopmp(RISCVVirtState *s, const MemMapEntry *memmap,
+ uint32_t irq_mmio_phandle) {
+ g_autofree char *name = NULL;
+ MachineState *ms = MACHINE(s);
+
+ name = g_strdup_printf("/soc/iopmp@%lx", (long)memmap[VIRT_IOPMP].base);
+ qemu_fdt_add_subnode(ms->fdt, name);
+ qemu_fdt_setprop_string(ms->fdt, name, "compatible", "riscv_iopmp");
+ qemu_fdt_setprop_cells(ms->fdt, name, "reg", 0x0, memmap[VIRT_IOPMP].base,
+ 0x0, memmap[VIRT_IOPMP].size);
+ qemu_fdt_setprop_cell(ms->fdt, name, "interrupt-parent", irq_mmio_phandle);
+ if (s->aia_type == VIRT_AIA_TYPE_NONE) {
+ qemu_fdt_setprop_cell(ms->fdt, name, "interrupts", IOPMP_IRQ);
+ } else {
+ qemu_fdt_setprop_cells(ms->fdt, name, "interrupts", IOPMP_IRQ, 0x4);
+ }
+}
+
+static void create_fdt_iopmp2(RISCVVirtState *s, const MemMapEntry *memmap,
+ uint32_t irq_mmio_phandle) {
+ g_autofree char *name;
+ MachineState *ms = MACHINE(s);
+
+ name = g_strdup_printf("/soc/iopmp2@%lx", (long)memmap[VIRT_IOPMP2].base);
+ qemu_fdt_add_subnode(ms->fdt, name);
+ qemu_fdt_setprop_string(ms->fdt, name, "compatible", "riscv_iopmp");
+ qemu_fdt_setprop_cells(ms->fdt, name, "reg", 0x0, memmap[VIRT_IOPMP2].base,
+ 0x0, memmap[VIRT_IOPMP2].size);
+ qemu_fdt_setprop_cell(ms->fdt, name, "interrupt-parent", irq_mmio_phandle);
+ if (s->aia_type == VIRT_AIA_TYPE_NONE) {
+ qemu_fdt_setprop_cell(ms->fdt, name, "interrupts", IOPMP2_IRQ);
+ } else {
+ qemu_fdt_setprop_cells(ms->fdt, name, "interrupts", IOPMP2_IRQ, 0x4);
+ }
+}
+
static void finalize_fdt(RISCVVirtState *s)
{
uint32_t phandle = 1, irq_mmio_phandle = 1, msi_pcie_phandle = 1;
@@ -1029,6 +1068,13 @@ static void finalize_fdt(RISCVVirtState *s)
create_fdt_uart(s, virt_memmap, irq_mmio_phandle);
create_fdt_rtc(s, virt_memmap, irq_mmio_phandle);
+
+ if (s->have_iopmp) {
+ create_fdt_iopmp(s, virt_memmap, irq_mmio_phandle);
+ if (s->have_iopmp_cascade) {
+ create_fdt_iopmp2(s, virt_memmap, irq_mmio_phandle);
+ }
+ }
}
static void create_fdt(RISCVVirtState *s, const MemMapEntry *memmap)
@@ -1363,7 +1409,7 @@ static void virt_machine_init(MachineState *machine)
MemoryRegion *system_memory = get_system_memory();
MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
char *soc_name;
- DeviceState *mmio_irqchip, *virtio_irqchip, *pcie_irqchip;
+ DeviceState *mmio_irqchip, *virtio_irqchip, *pcie_irqchip, *gpex_dev;
int i, base_hartid, hart_count;
int socket_count = riscv_socket_count(machine);
@@ -1531,7 +1577,7 @@ static void virt_machine_init(MachineState *machine)
qdev_get_gpio_in(virtio_irqchip, VIRTIO_IRQ + i));
}
- gpex_pcie_init(system_memory, pcie_irqchip, s);
+ gpex_dev = gpex_pcie_init(system_memory, pcie_irqchip, s);
create_platform_bus(s, mmio_irqchip);
@@ -1542,6 +1588,23 @@ static void virt_machine_init(MachineState *machine)
sysbus_create_simple("goldfish_rtc", memmap[VIRT_RTC].base,
qdev_get_gpio_in(mmio_irqchip, RTC_IRQ));
+ if (s->have_iopmp) {
+ /* IOPMP */
+ DeviceState *iopmp_dev = sysbus_create_simple(TYPE_IOPMP,
+ memmap[VIRT_IOPMP].base,
+ qdev_get_gpio_in(DEVICE(mmio_irqchip), IOPMP_IRQ));
+
+ /* PCI with IOPMP */
+ iopmp_setup_pci(iopmp_dev, PCI_HOST_BRIDGE(gpex_dev)->bus);
+
+ if (s->have_iopmp_cascade) {
+ DeviceState *iopmp_dev2 = sysbus_create_simple(TYPE_IOPMP,
+ memmap[VIRT_IOPMP2].base,
+ qdev_get_gpio_in(DEVICE(mmio_irqchip), IOPMP2_IRQ));
+ cascade_iopmp(iopmp_dev, iopmp_dev2);
+ }
+ }
+
for (i = 0; i < ARRAY_SIZE(s->flash); i++) {
/* Map legacy -drive if=pflash to machine properties */
pflash_cfi01_legacy_drive(s->flash[i],
@@ -1647,6 +1710,35 @@ static void virt_set_aclint(Object *obj, bool value, Error **errp)
s->have_aclint = value;
}
+static bool virt_get_iopmp(Object *obj, Error **errp)
+{
+ RISCVVirtState *s = RISCV_VIRT_MACHINE(obj);
+
+ return s->have_iopmp;
+}
+
+static void virt_set_iopmp(Object *obj, bool value, Error **errp)
+{
+ RISCVVirtState *s = RISCV_VIRT_MACHINE(obj);
+
+ s->have_iopmp = value;
+}
+
+static bool virt_get_iopmp_cascade(Object *obj, Error **errp)
+{
+ RISCVVirtState *s = RISCV_VIRT_MACHINE(obj);
+
+ return s->have_iopmp_cascade;
+}
+
+static void virt_set_iopmp_cascade(Object *obj, bool value, Error **errp)
+{
+ RISCVVirtState *s = RISCV_VIRT_MACHINE(obj);
+
+ s->have_iopmp_cascade = value;
+}
+
+
bool virt_is_acpi_enabled(RISCVVirtState *s)
{
return s->acpi != ON_OFF_AUTO_OFF;
@@ -1749,6 +1841,20 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
NULL, NULL);
object_class_property_set_description(oc, "acpi",
"Enable ACPI");
+
+ object_class_property_add_bool(oc, "iopmp", virt_get_iopmp,
+ virt_set_iopmp);
+ object_class_property_set_description(oc, "iopmp",
+ "Set on/off to enable/disable "
+ "iopmp device");
+
+ object_class_property_add_bool(oc, "iopmp-cascade",
+ virt_get_iopmp_cascade,
+ virt_set_iopmp_cascade);
+ object_class_property_set_description(oc, "iopmp-cascade",
+ "Set on/off to enable/disable "
+ "iopmp2 device which is cascaded by "
+ "iopmp1 device");
}
static const TypeInfo virt_machine_typeinfo = {
diff --git a/include/hw/riscv/virt.h b/include/hw/riscv/virt.h
index f89790fd58..07d95fde61 100644
--- a/include/hw/riscv/virt.h
+++ b/include/hw/riscv/virt.h
@@ -55,6 +55,8 @@ struct RISCVVirtState {
int fdt_size;
bool have_aclint;
+ bool have_iopmp;
+ bool have_iopmp_cascade;
RISCVVirtAIAType aia_type;
int aia_guests;
char *oem_id;
@@ -84,12 +86,16 @@ enum {
VIRT_PCIE_MMIO,
VIRT_PCIE_PIO,
VIRT_PLATFORM_BUS,
- VIRT_PCIE_ECAM
+ VIRT_PCIE_ECAM,
+ VIRT_IOPMP,
+ VIRT_IOPMP2,
};
enum {
UART0_IRQ = 10,
RTC_IRQ = 11,
+ IOPMP_IRQ = 12,
+ IOPMP2_IRQ = 13,
VIRTIO_IRQ = 1, /* 1 to 8 */
VIRTIO_COUNT = 8,
PCIE_IRQ = 0x20, /* 32 to 35 */
--
2.34.1
On 2/7/24 06:34, Ethan Chen wrote:
> If a source device is connected to the IOPMP device, its memory
> transaction will be checked by the IOPMP rule.
>
> When using RISC-V virt machine option "iopmp=on", the generic PCIe host
> bridge connects to IOPMP. The PCI devices on the bridge will connect to
> IOPMP with default source id(SID) from PCI BDF.
>
> - Add 'iopmp=on' option to add an iopmp device. It checks dma
> operations from the generic PCIe host bridge. This option is assumed
> to be "off"
> - Add 'iopmp_cascade=on' option to add second iopmp device which is
> cascaded by first iopmp device to machine. When iopmp option is "off"
> , this option has no effect.
>
> Signed-off-by: Ethan Chen <ethan84@andestech.com>
> ---
> docs/system/riscv/virt.rst | 12 ++++
> hw/riscv/Kconfig | 1 +
> hw/riscv/virt.c | 110 ++++++++++++++++++++++++++++++++++++-
> include/hw/riscv/virt.h | 8 ++-
> 4 files changed, 128 insertions(+), 3 deletions(-)
>
> diff --git a/docs/system/riscv/virt.rst b/docs/system/riscv/virt.rst
> index 9a06f95a34..ffcbe3a562 100644
> --- a/docs/system/riscv/virt.rst
> +++ b/docs/system/riscv/virt.rst
> @@ -116,6 +116,18 @@ The following machine-specific options are supported:
> having AIA IMSIC (i.e. "aia=aplic-imsic" selected). When not specified,
> the default number of per-HART VS-level AIA IMSIC pages is 0.
>
> +- iopmp=[on|off]
> +
> + When this option is "on", an IOPMP device is added to machine. It checks dma
> + operations from the generic PCIe host bridge. This option is assumed to be
> + "off".
> +
> +- iopmp_cascade=[on|off]
> +
> + When this option is "on", a second IOPMP device which is cascaded by first
> + IOPMP device is added to machine. When IOPMP option is "off", this option has
> + no effect. This option is assumed to be "off".
> +
> Running Linux kernel
> --------------------
>
> diff --git a/hw/riscv/Kconfig b/hw/riscv/Kconfig
> index a50717be87..c207b94747 100644
> --- a/hw/riscv/Kconfig
> +++ b/hw/riscv/Kconfig
> @@ -46,6 +46,7 @@ config RISCV_VIRT
> select PLATFORM_BUS
> select ACPI
> select ACPI_PCI
> + select RISCV_IOPMP
>
> config SHAKTI_C
> bool
> diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
> index f9fd1341fc..9a3afca8d7 100644
> --- a/hw/riscv/virt.c
> +++ b/hw/riscv/virt.c
> @@ -52,6 +52,7 @@
> #include "hw/display/ramfb.h"
> #include "hw/acpi/aml-build.h"
> #include "qapi/qapi-visit-common.h"
> +#include "hw/misc/riscv_iopmp.h"
>
> /* KVM AIA only supports APLIC MSI. APLIC Wired is always emulated by QEMU. */
> static bool virt_use_kvm_aia(RISCVVirtState *s)
> @@ -74,6 +75,8 @@ static const MemMapEntry virt_memmap[] = {
> [VIRT_UART0] = { 0x10000000, 0x100 },
> [VIRT_VIRTIO] = { 0x10001000, 0x1000 },
> [VIRT_FW_CFG] = { 0x10100000, 0x18 },
> + [VIRT_IOPMP] = { 0x10200000, 0x100000 },
> + [VIRT_IOPMP2] = { 0x10300000, 0x100000 },
> [VIRT_FLASH] = { 0x20000000, 0x4000000 },
> [VIRT_IMSIC_M] = { 0x24000000, VIRT_IMSIC_MAX_SIZE },
> [VIRT_IMSIC_S] = { 0x28000000, VIRT_IMSIC_MAX_SIZE },
> @@ -1011,6 +1014,42 @@ static void create_fdt_fw_cfg(RISCVVirtState *s, const MemMapEntry *memmap)
> g_free(nodename);
> }
>
> +static void create_fdt_iopmp(RISCVVirtState *s, const MemMapEntry *memmap,
> + uint32_t irq_mmio_phandle) {
> + g_autofree char *name = NULL;
> + MachineState *ms = MACHINE(s);
> +
> + name = g_strdup_printf("/soc/iopmp@%lx", (long)memmap[VIRT_IOPMP].base);
> + qemu_fdt_add_subnode(ms->fdt, name);
> + qemu_fdt_setprop_string(ms->fdt, name, "compatible", "riscv_iopmp");
> + qemu_fdt_setprop_cells(ms->fdt, name, "reg", 0x0, memmap[VIRT_IOPMP].base,
> + 0x0, memmap[VIRT_IOPMP].size);
> + qemu_fdt_setprop_cell(ms->fdt, name, "interrupt-parent", irq_mmio_phandle);
> + if (s->aia_type == VIRT_AIA_TYPE_NONE) {
> + qemu_fdt_setprop_cell(ms->fdt, name, "interrupts", IOPMP_IRQ);
> + } else {
> + qemu_fdt_setprop_cells(ms->fdt, name, "interrupts", IOPMP_IRQ, 0x4);
> + }
> +}
> +
> +static void create_fdt_iopmp2(RISCVVirtState *s, const MemMapEntry *memmap,
> + uint32_t irq_mmio_phandle) {
> + g_autofree char *name;
I believe we need to always initialize g_autofree variables. Please initialize it with
'NULL' like you did up there in create_fdt_iopmp().
With this change:
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
> + MachineState *ms = MACHINE(s);
> +
> + name = g_strdup_printf("/soc/iopmp2@%lx", (long)memmap[VIRT_IOPMP2].base);
> + qemu_fdt_add_subnode(ms->fdt, name);
> + qemu_fdt_setprop_string(ms->fdt, name, "compatible", "riscv_iopmp");
> + qemu_fdt_setprop_cells(ms->fdt, name, "reg", 0x0, memmap[VIRT_IOPMP2].base,
> + 0x0, memmap[VIRT_IOPMP2].size);
> + qemu_fdt_setprop_cell(ms->fdt, name, "interrupt-parent", irq_mmio_phandle);
> + if (s->aia_type == VIRT_AIA_TYPE_NONE) {
> + qemu_fdt_setprop_cell(ms->fdt, name, "interrupts", IOPMP2_IRQ);
> + } else {
> + qemu_fdt_setprop_cells(ms->fdt, name, "interrupts", IOPMP2_IRQ, 0x4);
> + }
> +}
> +
> static void finalize_fdt(RISCVVirtState *s)
> {
> uint32_t phandle = 1, irq_mmio_phandle = 1, msi_pcie_phandle = 1;
> @@ -1029,6 +1068,13 @@ static void finalize_fdt(RISCVVirtState *s)
> create_fdt_uart(s, virt_memmap, irq_mmio_phandle);
>
> create_fdt_rtc(s, virt_memmap, irq_mmio_phandle);
> +
> + if (s->have_iopmp) {
> + create_fdt_iopmp(s, virt_memmap, irq_mmio_phandle);
> + if (s->have_iopmp_cascade) {
> + create_fdt_iopmp2(s, virt_memmap, irq_mmio_phandle);
> + }
> + }
> }
>
> static void create_fdt(RISCVVirtState *s, const MemMapEntry *memmap)
> @@ -1363,7 +1409,7 @@ static void virt_machine_init(MachineState *machine)
> MemoryRegion *system_memory = get_system_memory();
> MemoryRegion *mask_rom = g_new(MemoryRegion, 1);
> char *soc_name;
> - DeviceState *mmio_irqchip, *virtio_irqchip, *pcie_irqchip;
> + DeviceState *mmio_irqchip, *virtio_irqchip, *pcie_irqchip, *gpex_dev;
> int i, base_hartid, hart_count;
> int socket_count = riscv_socket_count(machine);
>
> @@ -1531,7 +1577,7 @@ static void virt_machine_init(MachineState *machine)
> qdev_get_gpio_in(virtio_irqchip, VIRTIO_IRQ + i));
> }
>
> - gpex_pcie_init(system_memory, pcie_irqchip, s);
> + gpex_dev = gpex_pcie_init(system_memory, pcie_irqchip, s);
>
> create_platform_bus(s, mmio_irqchip);
>
> @@ -1542,6 +1588,23 @@ static void virt_machine_init(MachineState *machine)
> sysbus_create_simple("goldfish_rtc", memmap[VIRT_RTC].base,
> qdev_get_gpio_in(mmio_irqchip, RTC_IRQ));
>
> + if (s->have_iopmp) {
> + /* IOPMP */
> + DeviceState *iopmp_dev = sysbus_create_simple(TYPE_IOPMP,
> + memmap[VIRT_IOPMP].base,
> + qdev_get_gpio_in(DEVICE(mmio_irqchip), IOPMP_IRQ));
> +
> + /* PCI with IOPMP */
> + iopmp_setup_pci(iopmp_dev, PCI_HOST_BRIDGE(gpex_dev)->bus);
> +
> + if (s->have_iopmp_cascade) {
> + DeviceState *iopmp_dev2 = sysbus_create_simple(TYPE_IOPMP,
> + memmap[VIRT_IOPMP2].base,
> + qdev_get_gpio_in(DEVICE(mmio_irqchip), IOPMP2_IRQ));
> + cascade_iopmp(iopmp_dev, iopmp_dev2);
> + }
> + }
> +
> for (i = 0; i < ARRAY_SIZE(s->flash); i++) {
> /* Map legacy -drive if=pflash to machine properties */
> pflash_cfi01_legacy_drive(s->flash[i],
> @@ -1647,6 +1710,35 @@ static void virt_set_aclint(Object *obj, bool value, Error **errp)
> s->have_aclint = value;
> }
>
> +static bool virt_get_iopmp(Object *obj, Error **errp)
> +{
> + RISCVVirtState *s = RISCV_VIRT_MACHINE(obj);
> +
> + return s->have_iopmp;
> +}
> +
> +static void virt_set_iopmp(Object *obj, bool value, Error **errp)
> +{
> + RISCVVirtState *s = RISCV_VIRT_MACHINE(obj);
> +
> + s->have_iopmp = value;
> +}
> +
> +static bool virt_get_iopmp_cascade(Object *obj, Error **errp)
> +{
> + RISCVVirtState *s = RISCV_VIRT_MACHINE(obj);
> +
> + return s->have_iopmp_cascade;
> +}
> +
> +static void virt_set_iopmp_cascade(Object *obj, bool value, Error **errp)
> +{
> + RISCVVirtState *s = RISCV_VIRT_MACHINE(obj);
> +
> + s->have_iopmp_cascade = value;
> +}
> +
> +
> bool virt_is_acpi_enabled(RISCVVirtState *s)
> {
> return s->acpi != ON_OFF_AUTO_OFF;
> @@ -1749,6 +1841,20 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
> NULL, NULL);
> object_class_property_set_description(oc, "acpi",
> "Enable ACPI");
> +
> + object_class_property_add_bool(oc, "iopmp", virt_get_iopmp,
> + virt_set_iopmp);
> + object_class_property_set_description(oc, "iopmp",
> + "Set on/off to enable/disable "
> + "iopmp device");
> +
> + object_class_property_add_bool(oc, "iopmp-cascade",
> + virt_get_iopmp_cascade,
> + virt_set_iopmp_cascade);
> + object_class_property_set_description(oc, "iopmp-cascade",
> + "Set on/off to enable/disable "
> + "iopmp2 device which is cascaded by "
> + "iopmp1 device");
> }
>
> static const TypeInfo virt_machine_typeinfo = {
> diff --git a/include/hw/riscv/virt.h b/include/hw/riscv/virt.h
> index f89790fd58..07d95fde61 100644
> --- a/include/hw/riscv/virt.h
> +++ b/include/hw/riscv/virt.h
> @@ -55,6 +55,8 @@ struct RISCVVirtState {
>
> int fdt_size;
> bool have_aclint;
> + bool have_iopmp;
> + bool have_iopmp_cascade;
> RISCVVirtAIAType aia_type;
> int aia_guests;
> char *oem_id;
> @@ -84,12 +86,16 @@ enum {
> VIRT_PCIE_MMIO,
> VIRT_PCIE_PIO,
> VIRT_PLATFORM_BUS,
> - VIRT_PCIE_ECAM
> + VIRT_PCIE_ECAM,
> + VIRT_IOPMP,
> + VIRT_IOPMP2,
> };
>
> enum {
> UART0_IRQ = 10,
> RTC_IRQ = 11,
> + IOPMP_IRQ = 12,
> + IOPMP2_IRQ = 13,
> VIRTIO_IRQ = 1, /* 1 to 8 */
> VIRTIO_COUNT = 8,
> PCIE_IRQ = 0x20, /* 32 to 35 */
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