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[Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate |
Date: |
Tue, 9 Sep 2014 14:30:08 +0200 |
From: Pavel Dovgalyuk <address@hidden>
This patch disables raising an irq while loading the state of PCI bridge.
The aim of this patch is preserving the same behavior while saving and
restoring the VM state. IRQ is not raised while saving the state of the bridge.
That's why the behavior of the restored system will differ from
the original one. This patch eliminates raising an irq and just restores
the calculated state fields in post_load function.
Signed-off-by: Pavel Dovgalyuk <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
hw/pci-host/piix.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index e0e0946..cd50435 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -409,7 +409,7 @@ static void piix3_set_irq_pic(PIIX3State *piix3, int
pic_irq)
(pic_irq * PIIX_NUM_PIRQS))));
}
-static void piix3_set_irq_level(PIIX3State *piix3, int pirq, int level)
+static void piix3_set_irq_level_internal(PIIX3State *piix3, int pirq, int
level)
{
int pic_irq;
uint64_t mask;
@@ -422,6 +422,18 @@ static void piix3_set_irq_level(PIIX3State *piix3, int
pirq, int level)
mask = 1ULL << ((pic_irq * PIIX_NUM_PIRQS) + pirq);
piix3->pic_levels &= ~mask;
piix3->pic_levels |= mask * !!level;
+}
+
+static void piix3_set_irq_level(PIIX3State *piix3, int pirq, int level)
+{
+ int pic_irq;
+
+ pic_irq = piix3->dev.config[PIIX_PIRQC + pirq];
+ if (pic_irq >= PIIX_NUM_PIC_IRQS) {
+ return;
+ }
+
+ piix3_set_irq_level_internal(piix3, pirq, level);
piix3_set_irq_pic(piix3, pic_irq);
}
@@ -527,7 +539,18 @@ static void piix3_reset(void *opaque)
static int piix3_post_load(void *opaque, int version_id)
{
PIIX3State *piix3 = opaque;
- piix3_update_irq_levels(piix3);
+ int pirq;
+
+ /* Update irq levels without raising an interrupt which could
+ * happen in piix3_update_irq_levels. Raising an IRQ will
+ * bring the system to a different state than the saved one.
+ * Interrupt state is serialized separately through the i8259.
+ */
+ piix3->pic_levels = 0;
+ for (pirq = 0; pirq < PIIX_NUM_PIRQS; pirq++) {
+ piix3_set_irq_level_internal(piix3, pirq,
+ pci_bus_get_irq_level(piix3->dev.bus, pirq));
+ }
return 0;
}
--
2.1.0
- Re: [Qemu-devel] [PATCH 06/10] parallel: adding vmstate for save/restore, (continued)
- [Qemu-devel] [PATCH 05/10] fdc: adding vmstate for save/restore, Paolo Bonzini, 2014/09/09
- [Qemu-devel] [PATCH 07/10] serial: fixing vmstate for save/restore, Paolo Bonzini, 2014/09/09
- [Qemu-devel] [PATCH 08/10] pckbd: adding new fields to vmstate, Paolo Bonzini, 2014/09/09
- [Qemu-devel] [PATCH 10/10] mc146818rtc: add missed field to vmstate, Paolo Bonzini, 2014/09/09
- [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Juan Quintela, 2014/09/09
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Michael S. Tsirkin, 2014/09/09
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Paolo Bonzini, 2014/09/09
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Michael S. Tsirkin, 2014/09/09
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Paolo Bonzini, 2014/09/10
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Peter Maydell, 2014/09/10
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Paolo Bonzini, 2014/09/10
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Michael S. Tsirkin, 2014/09/10
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Michael S. Tsirkin, 2014/09/10
- Re: [Qemu-devel] [PATCH 09/10] piix: do not raise irq while loading vmstate, Paolo Bonzini, 2014/09/10