From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
PIT is emulated by the hypervisor so we don't need to emulate it 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 | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/hw/pc.c b/hw/pc.c
index 33778fe..a0ae981 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -43,6 +43,7 @@
#include "ui/qemu-spice.h"
#include "memory.h"
#include "exec-memory.h"
+#include "arch_init.h"
/* output Bochs bios info messages */
//#define DEBUG_BIOS
@@ -1121,7 +1122,7 @@ void pc_basic_device_init(qemu_irq *gsi,
DriveInfo *fd[MAX_FD];
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);
@@ -1142,7 +1143,9 @@ void pc_basic_device_init(qemu_irq *gsi,
qemu_register_boot_set(pc_boot_set, *rtc_state);
- pit = pit_init(0x40, 0);
+ if (!xen_available()) {
+ pit = pit_init(0x40, 0);
+ }
pcspk_init(pit);
for(i = 0; i < MAX_SERIAL_PORTS; i++) {
--
1.7.2.3
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