Stefano Stabellini
2011-Jun-15 16:36 UTC
[Xen-devel] [PATCH v2] xen: fix interrupt routing
Compared to the last version I only added a comment to the code.
- remove i440FX-xen and i440fx_write_config_xen
we don''t need to intercept pci config writes to i440FX anymore;
- introduce PIIX3-xen and piix3_write_config_xen
we do need to intercept pci config write to the PCI-ISA bridge to update
the PCI link routing;
- set the number of PIIX3-xen interrupts line to 128;
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
diff --git a/hw/pc.h b/hw/pc.h
index 0dcbee7..6d5730b 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -176,7 +176,6 @@ struct PCII440FXState;
typedef struct PCII440FXState PCII440FXState;
PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn, qemu_irq
*pic, ram_addr_t ram_size);
-PCIBus *i440fx_xen_init(PCII440FXState **pi440fx_state, int *piix3_devfn,
qemu_irq *pic, ram_addr_t ram_size);
void i440fx_init_memory_mappings(PCII440FXState *d);
/* piix4.c */
diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 9a22a8a..ba198de 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -124,11 +124,7 @@ static void pc_init1(ram_addr_t ram_size,
isa_irq = qemu_allocate_irqs(isa_irq_handler, isa_irq_state, 24);
if (pci_enabled) {
- if (!xen_enabled()) {
- pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, isa_irq,
ram_size);
- } else {
- pci_bus = i440fx_xen_init(&i440fx_state, &piix3_devfn,
isa_irq, ram_size);
- }
+ pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, isa_irq,
ram_size);
} else {
pci_bus = NULL;
i440fx_state = NULL;
diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index 7f1c4cc..1e29ec4 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -40,6 +40,7 @@ typedef PCIHostState I440FXState;
#define PIIX_NUM_PIC_IRQS 16 /* i8259 * 2 */
#define PIIX_NUM_PIRQS 4ULL /* PIRQ[A-D] */
+#define XEN_PIIX_NUM_PIRQS 128ULL
#define PIIX_PIRQC 0x60
typedef struct PIIX3State {
@@ -78,6 +79,8 @@ struct PCII440FXState {
#define I440FX_SMRAM 0x72
static void piix3_set_irq(void *opaque, int pirq, int level);
+static void piix3_write_config_xen(PCIDevice *dev,
+ uint32_t address, uint32_t val, int len);
/* return the global irq number corresponding to a given device irq
pin. We could also use the bus number to have a more precise
@@ -173,13 +176,6 @@ static void i440fx_write_config(PCIDevice *dev,
}
}
-static void i440fx_write_config_xen(PCIDevice *dev,
- uint32_t address, uint32_t val, int len)
-{
- xen_piix_pci_write_config_client(address, val, len);
- i440fx_write_config(dev, address, val, len);
-}
-
static int i440fx_load_old(QEMUFile* f, void *opaque, int version_id)
{
PCII440FXState *d = opaque;
@@ -267,8 +263,21 @@ static PCIBus *i440fx_common_init(const char *device_name,
d = pci_create_simple(b, 0, device_name);
*pi440fx_state = DO_UPCAST(PCII440FXState, dev, d);
- piix3 = DO_UPCAST(PIIX3State, dev,
- pci_create_simple_multifunction(b, -1, true,
"PIIX3"));
+ /* Xen supports additional interrupt routes from the PCI devices to
+ * the IOAPIC: the four pins of each PCI device on the bus are also
+ * connected to the IOAPIC directly.
+ * These additional routes can be discovered through ACPI. */
+ if (xen_enabled()) {
+ piix3 = DO_UPCAST(PIIX3State, dev,
+ pci_create_simple_multifunction(b, -1, true,
"PIIX3-xen"));
+ pci_bus_irqs(b, xen_piix3_set_irq, xen_pci_slot_get_pirq,
+ piix3, XEN_PIIX_NUM_PIRQS);
+ } else {
+ piix3 = DO_UPCAST(PIIX3State, dev,
+ pci_create_simple_multifunction(b, -1, true,
"PIIX3"));
+ pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq, piix3,
+ PIIX_NUM_PIRQS);
+ }
piix3->pic = pic;
(*pi440fx_state)->piix3 = piix3;
@@ -289,21 +298,6 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int
*piix3_devfn,
PCIBus *b;
b = i440fx_common_init("i440FX", pi440fx_state, piix3_devfn, pic,
ram_size);
- pci_bus_irqs(b, piix3_set_irq, pci_slot_get_pirq,
(*pi440fx_state)->piix3,
- PIIX_NUM_PIRQS);
-
- return b;
-}
-
-PCIBus *i440fx_xen_init(PCII440FXState **pi440fx_state, int *piix3_devfn,
- qemu_irq *pic, ram_addr_t ram_size)
-{
- PCIBus *b;
-
- b = i440fx_common_init("i440FX-xen", pi440fx_state, piix3_devfn,
pic, ram_size);
- pci_bus_irqs(b, xen_piix3_set_irq, xen_pci_slot_get_pirq,
- (*pi440fx_state)->piix3, PIIX_NUM_PIRQS);
-
return b;
}
@@ -365,6 +359,13 @@ 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);
+ piix3_write_config(dev, address, val, len);
+}
+
static void piix3_reset(void *opaque)
{
PIIX3State *d = opaque;
@@ -465,14 +466,6 @@ static PCIDeviceInfo i440fx_info[] = {
.init = i440fx_initfn,
.config_write = i440fx_write_config,
},{
- .qdev.name = "i440FX-xen",
- .qdev.desc = "Host bridge",
- .qdev.size = sizeof(PCII440FXState),
- .qdev.vmsd = &vmstate_i440fx,
- .qdev.no_user = 1,
- .init = i440fx_initfn,
- .config_write = i440fx_write_config_xen,
- },{
.qdev.name = "PIIX3",
.qdev.desc = "ISA bridge",
.qdev.size = sizeof(PIIX3State),
@@ -482,6 +475,15 @@ static PCIDeviceInfo i440fx_info[] = {
.init = piix3_initfn,
.config_write = piix3_write_config,
},{
+ .qdev.name = "PIIX3-xen",
+ .qdev.desc = "ISA bridge",
+ .qdev.size = sizeof(PIIX3State),
+ .qdev.vmsd = &vmstate_piix3,
+ .qdev.no_user = 1,
+ .no_hotplug = 1,
+ .init = piix3_initfn,
+ .config_write = piix3_write_config_xen,
+ },{
/* end of list */
}
};
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