Part of the feedback we received from Fabrice about the KVM patches for QEMU
is that we should create a separate device for the in-kernel APIC to avoid
having lots of if (kvm_enabled()) within the APIC code that were difficult to
understand why there were needed.
This patch separates the in-kernel PIT into a separate device. It also
introduces some configure logic to only compile in support for the in-kernel
PIT if it's available.
The result of this is that we now only need a single if (kvm_enabled()) to
determine which device to use. Besides making it more upstream friendly, I
think this makes the code much easier to understand.
Signed-off-by: Anthony Liguori <[EMAIL PROTECTED]>
diff --git a/qemu/Makefile.target b/qemu/Makefile.target
index 67a433e..2579688 100644
--- a/qemu/Makefile.target
+++ b/qemu/Makefile.target
@@ -585,6 +585,9 @@ OBJS+= ide.o pckbd.o ps2.o vga.o $(SOUND_HW) dma.o
OBJS+= fdc.o mc146818rtc.o serial.o i8259.o i8254.o pcspk.o pc.o
OBJS+= cirrus_vga.o apic.o parallel.o acpi.o piix_pci.o
OBJS+= usb-uhci.o vmmouse.o vmport.o vmware_vga.o extboot.o
+ifeq ($(USE_KVM_PIT), 1)
+OBJS+= i8254-kvm.o
+endif
CPPFLAGS += -DHAS_AUDIO -DHAS_AUDIO_CHOICE
endif
ifeq ($(TARGET_BASE_ARCH), ia64)
diff --git a/qemu/configure b/qemu/configure
index bbedddc..22f44c8 100755
--- a/qemu/configure
+++ b/qemu/configure
@@ -100,6 +100,7 @@ bsd="no"
linux="no"
kqemu="no"
kvm="no"
+kvm_cap_pit="no"
profiler="no"
kernel_path=""
cocoa="no"
@@ -612,6 +613,22 @@ int main(void) {
EOF
##########################################
+# KVM probe
+
+if test "$kvm" = "yes" ; then
+cat > $TMPC <<EOF
+#include <libkvm.h>
+#ifndef KVM_CAP_PIT
+#error "kvm no pit capability"
+#endif
+int main(void) { return 0; }
+EOF
+ if $cc $ARCH_CFLAGS -o $TMPE ${OS_CFLAGS} $TMPC 2> /dev/null ; then
+ kvm_cap_pit="yes"
+ fi
+fi
+
+##########################################
# SDL probe
sdl_too_old=no
@@ -1136,6 +1153,9 @@ configure_kvm() {
echo "#define USE_KVM 1" >> $config_h
echo "USE_KVM=1" >> $config_mak
echo "CONFIG_KVM_KERNEL_INC=$kernel_path/include" >> $config_mak
+ if test $kvm_cap_pit = "yes" ; then
+ echo "USE_KVM_PIT=1" >> $config_mak
+ fi
disable_cpu_emulation
fi
}
diff --git a/qemu/hw/i8254-kvm.c b/qemu/hw/i8254-kvm.c
new file mode 100644
index 0000000..f0669cb
--- /dev/null
+++ b/qemu/hw/i8254-kvm.c
@@ -0,0 +1,178 @@
+/*
+ * QEMU 8253/8254 interval timer emulation
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "hw.h"
+#include "pc.h"
+#include "isa.h"
+#include "i8254.h"
+
+#include "qemu-kvm.h"
+
+static PITState pit_state;
+
+static void kvm_kernel_pit_save_to_user(PITState *s)
+{
+ struct kvm_pit_state pit;
+ struct kvm_pit_channel_state *c;
+ struct PITChannelState *sc;
+ int i;
+
+ kvm_get_pit(kvm_context, &pit);
+
+ for (i = 0; i < 3; i++) {
+ c = &pit.channels[i];
+ sc = &s->channels[i];
+ sc->count = c->count;
+ sc->latched_count = c->latched_count;
+ sc->count_latched = c->count_latched;
+ sc->status_latched = c->status_latched;
+ sc->status = c->status;
+ sc->read_state = c->read_state;
+ sc->write_state = c->write_state;
+ sc->write_latch = c->write_latch;
+ sc->rw_mode = c->rw_mode;
+ sc->mode = c->mode;
+ sc->bcd = c->bcd;
+ sc->gate = c->gate;
+ sc->count_load_time = c->count_load_time;
+ }
+}
+
+static void kvm_kernel_pit_load_from_user(PITState *s)
+{
+ struct kvm_pit_state pit;
+ struct kvm_pit_channel_state *c;
+ struct PITChannelState *sc;
+ int i;
+
+ for (i = 0; i < 3; i++) {
+ c = &pit.channels[i];
+ sc = &s->channels[i];
+ c->count = sc->count;
+ c->latched_count = sc->latched_count;
+ c->count_latched = sc->count_latched;
+ c->status_latched = sc->status_latched;
+ c->status = sc->status;
+ c->read_state = sc->read_state;
+ c->write_state = sc->write_state;
+ c->write_latch = sc->write_latch;
+ c->rw_mode = sc->rw_mode;
+ c->mode = sc->mode;
+ c->bcd = sc->bcd;
+ c->gate = sc->gate;
+ c->count_load_time = sc->count_load_time;
+ }
+
+ kvm_set_pit(kvm_context, &pit);
+}
+
+static void pit_save(QEMUFile *f, void *opaque)
+{
+ PITState *pit = opaque;
+ PITChannelState *s;
+ int i;
+
+ kvm_kernel_pit_save_to_user(pit);
+
+ for(i = 0; i < 3; i++) {
+ s = &pit->channels[i];
+ qemu_put_be32(f, s->count);
+ qemu_put_be16s(f, &s->latched_count);
+ qemu_put_8s(f, &s->count_latched);
+ qemu_put_8s(f, &s->status_latched);
+ qemu_put_8s(f, &s->status);
+ qemu_put_8s(f, &s->read_state);
+ qemu_put_8s(f, &s->write_state);
+ qemu_put_8s(f, &s->write_latch);
+ qemu_put_8s(f, &s->rw_mode);
+ qemu_put_8s(f, &s->mode);
+ qemu_put_8s(f, &s->bcd);
+ qemu_put_8s(f, &s->gate);
+ qemu_put_be64(f, s->count_load_time);
+ }
+}
+
+static int pit_load(QEMUFile *f, void *opaque, int version_id)
+{
+ PITState *pit = opaque;
+ PITChannelState *s;
+ int i;
+
+ if (version_id != 1)
+ return -EINVAL;
+
+ for(i = 0; i < 3; i++) {
+ s = &pit->channels[i];
+ s->count=qemu_get_be32(f);
+ qemu_get_be16s(f, &s->latched_count);
+ qemu_get_8s(f, &s->count_latched);
+ qemu_get_8s(f, &s->status_latched);
+ qemu_get_8s(f, &s->status);
+ qemu_get_8s(f, &s->read_state);
+ qemu_get_8s(f, &s->write_state);
+ qemu_get_8s(f, &s->write_latch);
+ qemu_get_8s(f, &s->rw_mode);
+ qemu_get_8s(f, &s->mode);
+ qemu_get_8s(f, &s->bcd);
+ qemu_get_8s(f, &s->gate);
+ s->count_load_time=qemu_get_be64(f);
+ }
+
+ kvm_kernel_pit_load_from_user(pit);
+
+ return 0;
+}
+
+static inline void pit_load_count(PITChannelState *s, int val)
+{
+ if (val == 0)
+ val = 0x10000;
+ s->count_load_time = qemu_get_clock(vm_clock);
+ s->count = val;
+}
+
+static void pit_reset(void *opaque)
+{
+ PITState *pit = opaque;
+ PITChannelState *s;
+ int i;
+
+ for(i = 0;i < 3; i++) {
+ s = &pit->channels[i];
+ s->mode = 3;
+ s->gate = (i != 2);
+ pit_load_count(s, 0);
+ }
+}
+
+PITState *kvm_pit_init(int base, qemu_irq irq)
+{
+ PITState *pit = &pit_state;
+
+ register_savevm("i8254", base, 1, pit_save, pit_load, pit);
+
+ qemu_register_reset(pit_reset, pit);
+ pit_reset(pit);
+
+ return pit;
+}
diff --git a/qemu/hw/i8254.c b/qemu/hw/i8254.c
index e215f8b..18ed5b6 100644
--- a/qemu/hw/i8254.c
+++ b/qemu/hw/i8254.c
@@ -25,40 +25,10 @@
#include "pc.h"
#include "isa.h"
#include "qemu-timer.h"
-
-#include "qemu-kvm.h"
+#include "i8254.h"
//#define DEBUG_PIT
-#define RW_STATE_LSB 1
-#define RW_STATE_MSB 2
-#define RW_STATE_WORD0 3
-#define RW_STATE_WORD1 4
-
-typedef struct PITChannelState {
- int count; /* can be 65536 */
- uint16_t latched_count;
- uint8_t count_latched;
- uint8_t status_latched;
- uint8_t status;
- uint8_t read_state;
- uint8_t write_state;
- uint8_t write_latch;
- uint8_t rw_mode;
- uint8_t mode;
- uint8_t bcd; /* not supported */
- uint8_t gate; /* timer start */
- int64_t count_load_time;
- /* irq handling */
- int64_t next_transition_time;
- QEMUTimer *irq_timer;
- qemu_irq irq;
-} PITChannelState;
-
-struct PITState {
- PITChannelState channels[3];
-};
-
static PITState pit_state;
static void pit_irq_timer_update(PITChannelState *s, int64_t current_time);
@@ -414,78 +384,12 @@ static void pit_irq_timer(void *opaque)
pit_irq_timer_update(s, s->next_transition_time);
}
-#ifdef KVM_CAP_PIT
-
-static void kvm_kernel_pit_save_to_user(PITState *s)
-{
- struct kvm_pit_state pit;
- struct kvm_pit_channel_state *c;
- struct PITChannelState *sc;
- int i;
-
- kvm_get_pit(kvm_context, &pit);
-
- for (i = 0; i < 3; i++) {
- c = &pit.channels[i];
- sc = &s->channels[i];
- sc->count = c->count;
- sc->latched_count = c->latched_count;
- sc->count_latched = c->count_latched;
- sc->status_latched = c->status_latched;
- sc->status = c->status;
- sc->read_state = c->read_state;
- sc->write_state = c->write_state;
- sc->write_latch = c->write_latch;
- sc->rw_mode = c->rw_mode;
- sc->mode = c->mode;
- sc->bcd = c->bcd;
- sc->gate = c->gate;
- sc->count_load_time = c->count_load_time;
- }
-}
-
-static void kvm_kernel_pit_load_from_user(PITState *s)
-{
- struct kvm_pit_state pit;
- struct kvm_pit_channel_state *c;
- struct PITChannelState *sc;
- int i;
-
- for (i = 0; i < 3; i++) {
- c = &pit.channels[i];
- sc = &s->channels[i];
- c->count = sc->count;
- c->latched_count = sc->latched_count;
- c->count_latched = sc->count_latched;
- c->status_latched = sc->status_latched;
- c->status = sc->status;
- c->read_state = sc->read_state;
- c->write_state = sc->write_state;
- c->write_latch = sc->write_latch;
- c->rw_mode = sc->rw_mode;
- c->mode = sc->mode;
- c->bcd = sc->bcd;
- c->gate = sc->gate;
- c->count_load_time = sc->count_load_time;
- }
-
- kvm_set_pit(kvm_context, &pit);
-}
-
-#endif
-
static void pit_save(QEMUFile *f, void *opaque)
{
PITState *pit = opaque;
PITChannelState *s;
int i;
-#ifdef KVM_CAP_PIT
- if (kvm_enabled() && qemu_kvm_pit_in_kernel()) {
- kvm_kernel_pit_save_to_user(pit);
- }
-#endif
-
for(i = 0; i < 3; i++) {
s = &pit->channels[i];
qemu_put_be32(f, s->count);
@@ -537,13 +441,6 @@ static int pit_load(QEMUFile *f, void *opaque, int
version_id)
qemu_get_timer(f, s->irq_timer);
}
}
-
-#ifdef KVM_CAP_PIT
- if (kvm_enabled() && qemu_kvm_pit_in_kernel()) {
- kvm_kernel_pit_load_from_user(pit);
- }
-#endif
-
return 0;
}
@@ -566,12 +463,10 @@ PITState *pit_init(int base, qemu_irq irq)
PITState *pit = &pit_state;
PITChannelState *s;
- if (!kvm_enabled() || !qemu_kvm_pit_in_kernel()) {
- s = &pit->channels[0];
- /* the timer 0 is connected to an IRQ */
- s->irq_timer = qemu_new_timer(vm_clock, pit_irq_timer, s);
- s->irq = irq;
- }
+ s = &pit->channels[0];
+ /* the timer 0 is connected to an IRQ */
+ s->irq_timer = qemu_new_timer(vm_clock, pit_irq_timer, s);
+ s->irq = irq;
register_savevm("i8254", base, 1, pit_save, pit_load, pit);
diff --git a/qemu/hw/i8254.h b/qemu/hw/i8254.h
new file mode 100644
index 0000000..6ee86db
--- /dev/null
+++ b/qemu/hw/i8254.h
@@ -0,0 +1,36 @@
+#ifndef _QEMU_I8254_H
+#define _QEMU_I8254_H
+
+#include "hw.h"
+#include "qemu-timer.h"
+
+#define RW_STATE_LSB 1
+#define RW_STATE_MSB 2
+#define RW_STATE_WORD0 3
+#define RW_STATE_WORD1 4
+
+typedef struct PITChannelState {
+ int count; /* can be 65536 */
+ uint16_t latched_count;
+ uint8_t count_latched;
+ uint8_t status_latched;
+ uint8_t status;
+ uint8_t read_state;
+ uint8_t write_state;
+ uint8_t write_latch;
+ uint8_t rw_mode;
+ uint8_t mode;
+ uint8_t bcd; /* not supported */
+ uint8_t gate; /* timer start */
+ int64_t count_load_time;
+ /* irq handling */
+ int64_t next_transition_time;
+ QEMUTimer *irq_timer;
+ qemu_irq irq;
+} PITChannelState;
+
+struct PITState {
+ PITChannelState channels[3];
+};
+
+#endif
diff --git a/qemu/hw/pc.c b/qemu/hw/pc.c
index 1122b87..b8419f0 100644
--- a/qemu/hw/pc.c
+++ b/qemu/hw/pc.c
@@ -983,7 +983,10 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
if (pci_enabled) {
ioapic = ioapic_init();
}
- pit = pit_init(0x40, i8259[0]);
+ if (kvm_enabled() && qemu_kvm_pit_in_kernel())
+ pit = kvm_pit_init(0x40, i8259[0]);
+ else
+ pit = pit_init(0x40, i8259[0]);
pcspk_init(pit);
if (pci_enabled) {
pic_set_alt_irq_func(isa_pic, ioapic_set_irq, ioapic);
diff --git a/qemu/hw/pc.h b/qemu/hw/pc.h
index f879f30..e0da49d 100644
--- a/qemu/hw/pc.h
+++ b/qemu/hw/pc.h
@@ -58,6 +58,10 @@ int pit_get_initial_count(PITState *pit, int channel);
int pit_get_mode(PITState *pit, int channel);
int pit_get_out(PITState *pit, int channel, int64_t current_time);
+/* i8254-kvm.c */
+
+PITState *kvm_pit_init(int base, qemu_irq irq);
+
/* vmport.c */
void vmport_init(CPUState *env);
void vmport_register(unsigned char command, IOPortReadFunc *func, void
*opaque);
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