[Xen-devel] [PATCH v6 1/5] xen: do not initialize the interval timer and PCSPK emulator

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

PIT and PCSPK are emulated by the hypervisor so we don't need to emulate
them in Qemu: this patch prevents Qemu from waking up needlessly at
PIT_FREQ on Xen.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 hw/pc.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index 67f0479..08c69e9 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -46,6 +46,7 @@
 #include "ui/qemu-spice.h"
 #include "memory.h"
 #include "exec-memory.h"
+#include "arch_init.h"
 
 /* output Bochs bios info messages */
 //#define DEBUG_BIOS
@@ -1089,7 +1090,7 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq *gsi,
     qemu_irq pit_alt_irq = NULL;
     qemu_irq rtc_irq = NULL;
     qemu_irq *a20_line;
-    ISADevice *i8042, *port92, *vmmouse, *pit;
+    ISADevice *i8042, *port92, *vmmouse, *pit = NULL;
     qemu_irq *cpu_exit_irq;
 
     register_ioport_write(0x80, 1, 1, ioport80_write, NULL);
@@ -1120,14 +1121,16 @@ void pc_basic_device_init(ISABus *isa_bus, qemu_irq 
*gsi,
 
     if (kvm_irqchip_in_kernel()) {
         pit = kvm_pit_init(isa_bus, 0x40);
-    } else {
+    } else if (!xen_available()) {
         pit = pit_init(isa_bus, 0x40, pit_isa_irq, pit_alt_irq);
     }
     if (hpet) {
         /* connect PIT to output control line of the HPET */
         qdev_connect_gpio_out(hpet, 0, qdev_get_gpio_in(&pit->qdev, 0));
     }
-    pcspk_init(isa_bus, pit);
+    if (!xen_available()) {
+        pcspk_init(isa_bus, pit);
+    }
 
     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
         if (serial_hds[i]) {
-- 
1.7.2.5


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