Map GSIs manually when starting the guest.
This will allow us mapping new GSIs for MSIX in the future.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
tools/kvm/builtin-run.c | 3 ++
tools/kvm/include/kvm/irq.h | 3 ++
tools/kvm/irq.c | 75 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 81 insertions(+), 0 deletions(-)
diff --git a/tools/kvm/builtin-run.c b/tools/kvm/builtin-run.c
index 941129c..f9c3e7e 100644
--- a/tools/kvm/builtin-run.c
+++ b/tools/kvm/builtin-run.c
@@ -35,6 +35,7 @@
#include <kvm/vnc.h>
#include <kvm/sdl.h>
#include <kvm/framebuffer.h>
+#include <kvm/irq.h>
/* header files for gitish interface */
#include <kvm/builtin-run.h>
@@ -573,6 +574,8 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
kvm = kvm__init(kvm_dev, ram_size, guest_name);
+ irq__init();
+
kvm->single_step = single_step;
ioeventfd__init();
diff --git a/tools/kvm/include/kvm/irq.h b/tools/kvm/include/kvm/irq.h
index 7a75a0c..2f00b18 100644
--- a/tools/kvm/include/kvm/irq.h
+++ b/tools/kvm/include/kvm/irq.h
@@ -21,4 +21,7 @@ int irq__register_device(u32 dev, u8 *num, u8 *pin, u8 *line);
struct rb_node *irq__get_pci_tree(void);
+void irq__init(void);
+u32 irq__add_msix_route(u32 low, u32 high, u32 data);
+
#endif
diff --git a/tools/kvm/irq.c b/tools/kvm/irq.c
index 15f4702..fc5d800 100644
--- a/tools/kvm/irq.c
+++ b/tools/kvm/irq.c
@@ -1,16 +1,47 @@
#include "kvm/irq.h"
+#include "kvm/kvm.h"
+#include "kvm/util.h"
#include <linux/types.h>
#include <linux/rbtree.h>
#include <linux/list.h>
+#include <linux/kvm.h>
+#include <sys/ioctl.h>
#include <stddef.h>
#include <stdlib.h>
+#define IRQ_MAX_GSI 64
+#define IRQCHIP_MASTER 0
+#define IRQCHIP_SLAVE 1
+#define IRQCHIP_IOAPIC 2
+
static u8 next_line = 3;
static u8 next_dev = 1;
static struct rb_root pci_tree = RB_ROOT;
+/* First 24 GSIs are routed between IRQCHIPs and IOAPICs */
+static u32 gsi = 24;
+
+extern struct kvm *kvm;
+
+struct kvm_irq_routing *irq_routing;
+
+static int irq__add_routing(u32 gsi, u32 type, u32 irqchip, u32 pin)
+{
+ if (gsi >= IRQ_MAX_GSI)
+ return -ENOSPC;
+
+ irq_routing->entries[irq_routing->nr++] = (struct kvm_irq_routing_entry) {
+ .gsi = gsi,
+ .type = type,
+ .u.irqchip.irqchip = irqchip,
+ .u.irqchip.pin = pin,
+ };
+
+ return 0;
+}
+
static struct pci_dev *search(struct rb_root *root, u32 id)
{
struct rb_node *node = root->rb_node;
@@ -106,6 +137,50 @@ int irq__register_device(u32 dev, u8 *num, u8 *pin, u8 *line)
return -1;
}
+void irq__init(void)
+{
+ int i, r;
+
+ irq_routing = malloc(sizeof(struct kvm_irq_routing) +
+ IRQ_MAX_GSI * sizeof(struct kvm_irq_routing_entry));
+
+ /* Hook first 8 GSIs to master IRQCHIP */
+ for (i = 0; i < 8; i++)
+ irq__add_routing(i, KVM_IRQ_ROUTING_IRQCHIP, IRQCHIP_MASTER, i);
+
+ /* Hook next 8 GSIs to slave IRQCHIP */
+ for (i = 8; i < 16; i++)
+ irq__add_routing(i, KVM_IRQ_ROUTING_IRQCHIP, IRQCHIP_SLAVE, 8-i);
+
+ /* Last but not least, IOAPIC */
+ for (i = 0; i < 24; i++) {
+ if (i == 0)
+ irq__add_routing(i, KVM_IRQ_ROUTING_IRQCHIP, IRQCHIP_IOAPIC, 2);
+ else
+ irq__add_routing(i, KVM_IRQ_ROUTING_IRQCHIP, IRQCHIP_IOAPIC, i);
+ }
+
+ r = ioctl(kvm->vm_fd, KVM_SET_GSI_ROUTING, irq_routing);
+ if (r)
+ die("Failed setting GSI routes");
+}
+
+u32 irq__add_msix_route(u32 low, u32 high, u32 data)
+{
+ irq_routing->entries[irq_routing->nr++] = (struct kvm_irq_routing_entry) {
+ .gsi = gsi,
+ .type = KVM_IRQ_ROUTING_MSI,
+ .u.msi.address_lo = low,
+ .u.msi.address_hi = high,
+ .u.msi.data = data,
+ };
+
+ if (ioctl(kvm->vm_fd, KVM_SET_GSI_ROUTING, irq_routing))
+ return -1;
+
+ return gsi++;
+}
+
struct rb_node *irq__get_pci_tree(void)
{
return rb_first(&pci_tree);
--
1.7.6
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