[Qemu-devel] [PATCH 12/15] piix_pci: Introduces Xen specific call for irq.

[stefano.stabellini@eu.citrix.com]

From: Anthony PERARD <anthony.perard@citrix.com>

This patch introduces Xen specific call in piix_pci.

The specific part for Xen is in write_config, set_irq and get_pirq.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 hw/piix_pci.c |   19 ++++++++++++++++---
 hw/xen.h      |    3 +++
 xen-all.c     |   25 +++++++++++++++++++++++++
 xen-stub.c    |    9 +++++++++
 4 files changed, 53 insertions(+), 3 deletions(-)

diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index f152a0f..994057f 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -28,6 +28,7 @@
 #include "pci_host.h"
 #include "isa.h"
 #include "sysbus.h"
+#include "xen.h"
 
 /*
  * I440FX chipset data sheet.
@@ -61,9 +62,13 @@ static void piix3_set_irq(void *opaque, int irq_num, int level);
    mapping. */
 static int pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
 {
-    int slot_addend;
-    slot_addend = (pci_dev->devfn >> 3) - 1;
-    return (irq_num + slot_addend) & 3;
+    if (!xen_enabled()) {
+        int slot_addend;
+        slot_addend = (pci_dev->devfn >> 3) - 1;
+        return (irq_num + slot_addend) & 3;
+    } else {
+        return irq_num + ((pci_dev->devfn >> 3) << 2);
+    }
 }
 
 static void update_pam(PCII440FXState *d, uint32_t start, uint32_t end, int r)
@@ -142,6 +147,9 @@ static void i440fx_write_config(PCIDevice *dev,
 {
     PCII440FXState *d = DO_UPCAST(PCII440FXState, dev, dev);
 
+    if (xen_enabled())
+        xen_piix_pci_write_config_client(address, val, len);
+
     /* XXX: implement SMRAM.D_LOCK */
     pci_default_write_config(dev, address, val, len);
     if (ranges_overlap(address, len, I440FX_PAM, I440FX_PAM_SIZE) ||
@@ -255,6 +263,11 @@ static void piix3_set_irq(void *opaque, int irq_num, int level)
     int i, pic_irq, pic_level;
     PIIX3State *piix3 = opaque;
 
+    if (xen_enabled()) {
+        xen_piix3_set_irq(irq_num, level);
+        return;
+    }
+
     piix3->pci_irq_levels[irq_num] = level;
 
     /* now we change the pic irq level according to the piix irq mappings */
diff --git a/hw/xen.h b/hw/xen.h
index f1d01d3..77012c2 100644
--- a/hw/xen.h
+++ b/hw/xen.h
@@ -26,4 +26,7 @@ extern int xen_allowed;
 #define xen_enabled() (0)
 #endif
 
+void xen_piix3_set_irq(int irq_num, int level);
+void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len);
+
 #endif /* QEMU_HW_XEN_H */
diff --git a/xen-all.c b/xen-all.c
index e69de29..2d789ad 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -0,0 +1,25 @@
+#include "config.h"
+
+#include "hw/xen.h"
+#include "hw/xen_backend.h"
+
+void xen_piix3_set_irq(int irq_num, int level)
+{
+    xc_hvm_set_pci_intx_level(xen_xc, xen_domid, 0, 0, irq_num >> 2,
+            irq_num & 3, level);
+}
+
+void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
+{
+    int i;
+
+    /* Scan for updates to PCI link routes (0x60-0x63). */
+    for (i = 0; i < len; i++) {
+        uint8_t v = (val >> (8*i)) & 0xff;
+        if (v & 0x80)
+            v = 0;
+        v &= 0xf;
+        if (((address+i) >= 0x60) && ((address+i) <= 0x63))
+            xc_hvm_set_pci_link_route(xen_xc, xen_domid, address + i - 0x60, v);
+    }
+}
diff --git a/xen-stub.c b/xen-stub.c
index e69de29..38c64cf 100644
--- a/xen-stub.c
+++ b/xen-stub.c
@@ -0,0 +1,9 @@
+#include "hw/xen.h"
+
+void xen_piix3_set_irq(int irq_num, int level)
+{
+}
+
+void xen_piix_pci_write_config_client(uint32_t address, uint32_t val, int len)
+{
+}
-- 
1.7.0.4