Fix guest OS hang when 64bit PCI bar present
This patch addresses the issue fully described here: http://lists.nongnu.org/archive/html/qemu-devel/2013-02/msg01804.html Linux kernels prior to 2.6.36 do not disable the PCI device during enumeration process. Since lower and higher parts of a 64bit BAR are programmed separately this leads to qemu receiving a request to occupy a completely wrong address region for a short period of time. We have found that the boot process screws up completely if kvm-apic range is overlapped even for a short period of time (it is fine for other regions though). This patch raises the priority of the kvm-apic memory region, so it is never pushed out by PCI devices. The patch is quite safe as it does not touch memory manager. Signed-off-by: Alexey Korolev <akorolex@gmail.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
parent
2af234e61d
commit
7feb640cf3
27
hw/sysbus.c
27
hw/sysbus.c
@ -48,7 +48,8 @@ void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
|
|||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
|
static void sysbus_mmio_map_common(SysBusDevice *dev, int n, hwaddr addr,
|
||||||
|
bool may_overlap, unsigned priority)
|
||||||
{
|
{
|
||||||
assert(n >= 0 && n < dev->num_mmio);
|
assert(n >= 0 && n < dev->num_mmio);
|
||||||
|
|
||||||
@ -61,11 +62,29 @@ void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
|
|||||||
memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
|
memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
|
||||||
}
|
}
|
||||||
dev->mmio[n].addr = addr;
|
dev->mmio[n].addr = addr;
|
||||||
memory_region_add_subregion(get_system_memory(),
|
if (may_overlap) {
|
||||||
addr,
|
memory_region_add_subregion_overlap(get_system_memory(),
|
||||||
dev->mmio[n].memory);
|
addr,
|
||||||
|
dev->mmio[n].memory,
|
||||||
|
priority);
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
memory_region_add_subregion(get_system_memory(),
|
||||||
|
addr,
|
||||||
|
dev->mmio[n].memory);
|
||||||
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
|
||||||
|
{
|
||||||
|
sysbus_mmio_map_common(dev, n, addr, false, 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
|
||||||
|
unsigned priority)
|
||||||
|
{
|
||||||
|
sysbus_mmio_map_common(dev, n, addr, true, priority);
|
||||||
|
}
|
||||||
|
|
||||||
/* Request an IRQ source. The actual IRQ object may be populated later. */
|
/* Request an IRQ source. The actual IRQ object may be populated later. */
|
||||||
void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
|
void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
|
||||||
|
@ -56,6 +56,8 @@ void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size);
|
|||||||
|
|
||||||
void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq);
|
void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq);
|
||||||
void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr);
|
void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr);
|
||||||
|
void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
|
||||||
|
unsigned priority);
|
||||||
void sysbus_add_memory(SysBusDevice *dev, hwaddr addr,
|
void sysbus_add_memory(SysBusDevice *dev, hwaddr addr,
|
||||||
MemoryRegion *mem);
|
MemoryRegion *mem);
|
||||||
void sysbus_add_memory_overlap(SysBusDevice *dev, hwaddr addr,
|
void sysbus_add_memory_overlap(SysBusDevice *dev, hwaddr addr,
|
||||||
|
@ -2088,7 +2088,8 @@ static void x86_cpu_apic_init(X86CPU *cpu, Error **errp)
|
|||||||
/* NOTE: the APIC is directly connected to the CPU - it is not
|
/* NOTE: the APIC is directly connected to the CPU - it is not
|
||||||
on the global memory bus. */
|
on the global memory bus. */
|
||||||
/* XXX: what if the base changes? */
|
/* XXX: what if the base changes? */
|
||||||
sysbus_mmio_map(SYS_BUS_DEVICE(env->apic_state), 0, MSI_ADDR_BASE);
|
sysbus_mmio_map_overlap(SYS_BUS_DEVICE(env->apic_state), 0,
|
||||||
|
MSI_ADDR_BASE, 0x1000);
|
||||||
apic_mapped = 1;
|
apic_mapped = 1;
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
Loading…
Reference in New Issue
Block a user