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[Xen-devel] Re: [Qemu-devel] [PATCH V9 09/16] xen: add a 8259 Interrupt

To: anthony.perard@xxxxxxxxxx
Subject: [Xen-devel] Re: [Qemu-devel] [PATCH V9 09/16] xen: add a 8259 Interrupt Controller
From: Anthony Liguori <anthony@xxxxxxxxxxxxx>
Date: Wed, 26 Jan 2011 17:04:04 -0600
Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, QEMU-devel <qemu-devel@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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On 01/25/2011 08:29 AM, anthony.perard@xxxxxxxxxx wrote:
From: Anthony PERARD<anthony.perard@xxxxxxxxxx>

Introduce a 8259 Interrupt Controller for target-xen; every set_irq
call makes a Xen hypercall.

Signed-off-by: Anthony PERARD<anthony.perard@xxxxxxxxxx>
Signed-off-by: Stefano Stabellini<stefano.stabellini@xxxxxxxxxxxxx>
---
  hw/xen_common.h     |    2 ++
  hw/xen_machine_fv.c |    5 ++---
  xen-all.c           |   12 ++++++++++++
  3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/hw/xen_common.h b/hw/xen_common.h
index b98d107..0cc935a 100644
--- a/hw/xen_common.h
+++ b/hw/xen_common.h
@@ -42,4 +42,6 @@ static inline int xc_fd(xc_interface *xen_xc)
  }
  #endif

+qemu_irq *i8259_xen_init(void);
+
  #endif /* QEMU_HW_XEN_COMMON_H */
diff --git a/hw/xen_machine_fv.c b/hw/xen_machine_fv.c
index 2f51625..0a90312 100644
--- a/hw/xen_machine_fv.c
+++ b/hw/xen_machine_fv.c
@@ -37,6 +37,7 @@
  #include "xen_common.h"
  #include "xen/hvm/hvm_info_table.h"
  #include "xen_platform.h"
+#include "xen_common.h"

  #define MAX_IDE_BUS 2

@@ -52,7 +53,6 @@ static void xen_init_fv(ram_addr_t ram_size,
      PCIBus *pci_bus;
      PCII440FXState *i440fx_state;
      int piix3_devfn = -1;
-    qemu_irq *cpu_irq;
      qemu_irq *isa_irq;
      qemu_irq *i8259;
      qemu_irq *cmos_s3;
@@ -76,8 +76,7 @@ static void xen_init_fv(ram_addr_t ram_size,
      env = cpu_init(cpu_model);
      env->halted = 1;

-    cpu_irq = pc_allocate_cpu_irq();
-    i8259 = i8259_init(cpu_irq[0]);
+    i8259 = i8259_xen_init();
      isa_irq_state = qemu_mallocz(sizeof (*isa_irq_state));
      isa_irq_state->i8259 = i8259;

diff --git a/xen-all.c b/xen-all.c
index 8a51873..205cbc4 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -43,6 +43,18 @@ void xen_piix_pci_write_config_client(uint32_t address, 
uint32_t val, int len)
      }
  }

+/* i8259 */
+
+static void i8259_set_irq(void *opaque, int irq, int level)
+{
+    xc_hvm_set_isa_irq_level(xen_xc, xen_domid, irq, level);
+}
+
+qemu_irq *i8259_xen_init(void)
+{
+    return qemu_allocate_irqs(i8259_set_irq, NULL, 16);
+}
+


I think it would make more sense to just call it a Xen interrupt controller as it's clearly not an i8259. Xen may emulate an i8259 in the kernel but this has nothing to do with that AFAIK.

Regards,

Anthony Liguori

  /* Initialise Xen */

  int xen_init(int smp_cpus)


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