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[Qemu-devel] [PATCH v12 14/27] q35: ioapic: add support for emulated IOA
From: |
Peter Xu |
Subject: |
[Qemu-devel] [PATCH v12 14/27] q35: ioapic: add support for emulated IOAPIC IR |
Date: |
Thu, 14 Jul 2016 13:56:23 +0800 |
This patch translates all IOAPIC interrupts into MSI ones. One pseudo
ioapic address space is added to transfer the MSI message. By default,
it will be system memory address space. When IR is enabled, it will be
IOMMU address space.
Currently, only emulated IOAPIC is supported.
Idea suggested by Jan Kiszka and Rita Sinha in the following patch:
https://lists.gnu.org/archive/html/qemu-devel/2016-03/msg01933.html
Signed-off-by: Peter Xu <address@hidden>
---
hw/i386/intel_iommu.c | 6 +++++-
hw/i386/pc.c | 3 +++
hw/intc/ioapic.c | 28 ++++++++++++++++++++++++----
include/hw/i386/apic-msidef.h | 1 +
include/hw/i386/ioapic_internal.h | 1 +
include/hw/i386/pc.h | 4 ++++
6 files changed, 38 insertions(+), 5 deletions(-)
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 3d1b15d..feaf806 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -28,6 +28,7 @@
#include "hw/i386/pc.h"
#include "hw/boards.h"
#include "hw/i386/x86-iommu.h"
+#include "hw/pci-host/q35.h"
/*#define DEBUG_INTEL_IOMMU*/
#ifdef DEBUG_INTEL_IOMMU
@@ -2369,7 +2370,8 @@ static AddressSpace *vtd_host_dma_iommu(PCIBus *bus, void
*opaque, int devfn)
static void vtd_realize(DeviceState *dev, Error **errp)
{
- PCIBus *bus = PC_MACHINE(qdev_get_machine())->bus;
+ PCMachineState *pcms = PC_MACHINE(qdev_get_machine());
+ PCIBus *bus = pcms->bus;
IntelIOMMUState *s = INTEL_IOMMU_DEVICE(dev);
VTD_DPRINTF(GENERAL, "");
@@ -2385,6 +2387,8 @@ static void vtd_realize(DeviceState *dev, Error **errp)
vtd_init(s);
sysbus_mmio_map(SYS_BUS_DEVICE(s), 0, Q35_HOST_BRIDGE_IOMMU_ADDR);
pci_setup_iommu(bus, vtd_host_dma_iommu, dev);
+ /* Pseudo address space under root PCI bus. */
+ pcms->ioapic_as = vtd_host_dma_iommu(bus, s, Q35_PSEUDO_DEVFN_IOAPIC);
}
static void vtd_class_init(ObjectClass *klass, void *data)
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index cd1745e..4c67bae 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1375,6 +1375,9 @@ void pc_memory_init(PCMachineState *pcms,
rom_add_option(option_rom[i].name, option_rom[i].bootindex);
}
pcms->fw_cfg = fw_cfg;
+
+ /* Init default IOAPIC address space */
+ pcms->ioapic_as = &address_space_memory;
}
qemu_irq pc_allocate_cpu_irq(void)
diff --git a/hw/intc/ioapic.c b/hw/intc/ioapic.c
index 273bb08..36dd42a 100644
--- a/hw/intc/ioapic.c
+++ b/hw/intc/ioapic.c
@@ -29,6 +29,8 @@
#include "hw/i386/ioapic_internal.h"
#include "include/hw/pci/msi.h"
#include "sysemu/kvm.h"
+#include "target-i386/cpu.h"
+#include "hw/i386/apic-msidef.h"
//#define DEBUG_IOAPIC
@@ -50,13 +52,15 @@ extern int ioapic_no;
static void ioapic_service(IOAPICCommonState *s)
{
+ AddressSpace *ioapic_as = PC_MACHINE(qdev_get_machine())->ioapic_as;
+ uint32_t addr, data;
uint8_t i;
uint8_t trig_mode;
uint8_t vector;
uint8_t delivery_mode;
uint32_t mask;
uint64_t entry;
- uint8_t dest;
+ uint16_t dest_idx;
uint8_t dest_mode;
for (i = 0; i < IOAPIC_NUM_PINS; i++) {
@@ -67,7 +71,14 @@ static void ioapic_service(IOAPICCommonState *s)
entry = s->ioredtbl[i];
if (!(entry & IOAPIC_LVT_MASKED)) {
trig_mode = ((entry >> IOAPIC_LVT_TRIGGER_MODE_SHIFT) & 1);
- dest = entry >> IOAPIC_LVT_DEST_SHIFT;
+ /*
+ * By default, this would be dest_id[8] +
+ * reserved[8]. When IR is enabled, this would be
+ * interrupt_index[15] + interrupt_format[1]. This
+ * field never means anything, but only used to
+ * generate corresponding MSI.
+ */
+ dest_idx = entry >> IOAPIC_LVT_DEST_IDX_SHIFT;
dest_mode = (entry >> IOAPIC_LVT_DEST_MODE_SHIFT) & 1;
delivery_mode =
(entry >> IOAPIC_LVT_DELIV_MODE_SHIFT) & IOAPIC_DM_MASK;
@@ -97,8 +108,17 @@ static void ioapic_service(IOAPICCommonState *s)
#else
(void)coalesce;
#endif
- apic_deliver_irq(dest, dest_mode, delivery_mode, vector,
- trig_mode);
+ /* No matter whether IR is enabled, we translate
+ * the IOAPIC message into a MSI one, and its
+ * address space will decide whether we need a
+ * translation. */
+ addr = APIC_DEFAULT_ADDRESS | \
+ (dest_idx << MSI_ADDR_DEST_IDX_SHIFT) |
+ (dest_mode << MSI_ADDR_DEST_MODE_SHIFT);
+ data = (vector << MSI_DATA_VECTOR_SHIFT) |
+ (trig_mode << MSI_DATA_TRIGGER_SHIFT) |
+ (delivery_mode << MSI_DATA_DELIVERY_MODE_SHIFT);
+ stl_le_phys(ioapic_as, addr, data);
}
}
}
diff --git a/include/hw/i386/apic-msidef.h b/include/hw/i386/apic-msidef.h
index 6e2eb71..8b4d4cc 100644
--- a/include/hw/i386/apic-msidef.h
+++ b/include/hw/i386/apic-msidef.h
@@ -25,6 +25,7 @@
#define MSI_ADDR_REDIRECTION_SHIFT 3
#define MSI_ADDR_DEST_ID_SHIFT 12
+#define MSI_ADDR_DEST_IDX_SHIFT 4
#define MSI_ADDR_DEST_ID_MASK 0x00ffff0
#endif /* HW_APIC_MSIDEF_H */
diff --git a/include/hw/i386/ioapic_internal.h
b/include/hw/i386/ioapic_internal.h
index cab9e67..31dafb3 100644
--- a/include/hw/i386/ioapic_internal.h
+++ b/include/hw/i386/ioapic_internal.h
@@ -31,6 +31,7 @@
#define IOAPIC_VERSION 0x11
#define IOAPIC_LVT_DEST_SHIFT 56
+#define IOAPIC_LVT_DEST_IDX_SHIFT 48
#define IOAPIC_LVT_MASKED_SHIFT 16
#define IOAPIC_LVT_TRIGGER_MODE_SHIFT 15
#define IOAPIC_LVT_REMOTE_IRR_SHIFT 14
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 2123532..ef199fd 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -72,6 +72,10 @@ struct PCMachineState {
/* NUMA information: */
uint64_t numa_nodes;
uint64_t *node_mem;
+
+ /* Address space used by IOAPIC device. All IOAPIC interrupts
+ * will be translated to MSI messages in the address space. */
+ AddressSpace *ioapic_as;
};
#define PC_MACHINE_ACPI_DEVICE_PROP "acpi-device"
--
2.4.11
- [Qemu-devel] [PATCH v12 06/27] intel_iommu: allow queued invalidation for IR, (continued)
- [Qemu-devel] [PATCH v12 06/27] intel_iommu: allow queued invalidation for IR, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 07/27] intel_iommu: set IR bit for ECAP register, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 08/27] acpi: add DMAR scope definition for root IOAPIC, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 09/27] intel_iommu: define interrupt remap table addr register, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 10/27] intel_iommu: handle interrupt remap enable, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 11/27] intel_iommu: define several structs for IOMMU IR, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 12/27] intel_iommu: add IR translation faults defines, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 13/27] intel_iommu: Add support for PCI MSI remap, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 14/27] q35: ioapic: add support for emulated IOAPIC IR,
Peter Xu <=
- [Qemu-devel] [PATCH v12 15/27] ioapic: introduce ioapic_entry_parse() helper, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 16/27] intel_iommu: add support for split irqchip, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 17/27] x86-iommu: introduce IEC notifiers, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 18/27] ioapic: register IOMMU IEC notifier for ioapic, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 19/27] intel_iommu: Add support for Extended Interrupt Mode, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 20/27] intel_iommu: add SID validation for IR, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 21/27] kvm-irqchip: simplify kvm_irqchip_add_msi_route, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 22/27] kvm-irqchip: i386: add hook for add/remove virq, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 23/27] kvm-irqchip: x86: add msi route notify fn, Peter Xu, 2016/07/14
- [Qemu-devel] [PATCH v12 24/27] kvm-irqchip: do explicit commit when update irq, Peter Xu, 2016/07/14