On Tue, Dec 15, 2009 at 12:26:15PM +0100, Hannes Reinecke wrote:
> Michael S. Tsirkin wrote:
> > On Tue, Dec 15, 2009 at 12:59:41PM +0200, Avi Kivity wrote:
> >> On 12/15/2009 12:57 PM, Hannes Reinecke wrote:
> >>> Hi all,
> >>>
> >>> I just triggered a nasty indefinite recursion in pci_default_read_config:
> >>>
> >>> uint32_t pci_default_read_config(PCIDevice *d,
> >>> uint32_t address, int len)
> >>> {
> >>> uint32_t val = 0;
> >>> assert(len == 1 || len == 2 || len == 4);
> >>>
> >>> if (pci_access_cap_config(d, address, len)) {
> >>> return d->cap.config_read(d, address, len);
> >>> }
> >>>
> >>> len = MIN(len, pci_config_size(d) - address);
> >>> memcpy(&val, d->config + address, len);
> >>> return le32_to_cpu(val);
> >>> }
> >>>
> >>> And d->cap.config_read is pointing to pci_default_read_config:
> >>>
> >>> (gdb) print *d
> >>> $3 = {qdev = {id = 0xc99b10 "01:10.0", state = DEV_STATE_INITIALIZED,
> >>> opts = 0xc99ad0, hotplugged = 0, info = 0x837e60, parent_bus = 0xc71710,
> >>> num_gpio_out = 0, gpio_out = 0x0, num_gpio_in = 0, gpio_in = 0x0,
> >>> child_bus = {lh_first = 0x0}, num_child_bus = 0, sibling = {
> >>> le_next = 0xc99c30, le_prev = 0xc71730}},
> >>> config = 0xca3010 "\206\200\312\020\003",
> >>> cmask = 0xca3120 "\377\377\377\377", wmask = 0xca3230 "",
> >>> used = 0xca3340 "", bus = 0xc71710, devfn = 32,
> >>> name = "pci-assign", '\000'<repeats 53 times>, io_regions = {{
> >>> addr = 4060102656, size = 16384, filtered_size = 16384, type = 0 '\000',
> >>> map_func = 0x46a5f0<assigned_dev_iomem_map>}, {addr = 0, size = 0,
> >>> filtered_size = 0, type = 0 '\000', map_func = 0}, {addr = 0, size = 0,
> >>> filtered_size = 0, type = 0 '\000', map_func = 0}, {addr = 4060119040,
> >>> size = 16384, filtered_size = 16384, type = 0 '\000',
> >>> map_func = 0x46a5f0<assigned_dev_iomem_map>}, {addr = 0, size = 0,
> >>> filtered_size = 0, type = 0 '\000', map_func = 0}, {addr = 0, size = 0,
> >>> filtered_size = 0, type = 0 '\000', map_func = 0}, {addr = 0, size = 0,
> >>> filtered_size = 0, type = 0 '\000', map_func = 0}},
> >>> config_read = 0x46a050<assigned_dev_pci_read_config>,
> >>> config_write = 0x469f30<assigned_dev_pci_write_config>, irq = 0xca3450,
> >>> irq_state = 0 '\000', cap_present = 0, msix_cap = 0 '\000',
> >>> msix_entries_nr = 0, msix_table_page = 0x0, msix_mmio_index = 0,
> >>> msix_entry_used = 0x0, msix_bar_size = 0, version_id = 2,
> >>> msix_page_size = 0, msix_irq_entries = 0x0, cap = {supported = 1,
> >>> start = 64, length = 16,
> >>> config_read = 0x416770<pci_default_cap_read_config>,
> >>> config_write = 0x46b750<assigned_device_pci_cap_write_config>}}
> >>>
> >> Michael? This is likely a bad merge on my part. Can you help?
> >>
> >> --
> >> error compiling committee.c: too many arguments to function
> >
> >
> > Um, yes. I think the following is the right way to do this.
> > As a side note, we really should work to remove all these
> > hacks and make assignment use capability support
> > in upstream qemu.
> >
> > --
> >
> > diff --git a/hw/pci.c b/hw/pci.c
> > index 110a5fc..a74d3d4 100644
> > --- a/hw/pci.c
> > +++ b/hw/pci.c
> > @@ -1016,19 +1016,26 @@ static void pci_update_irq_disabled(PCIDevice *d, int was_irq_disabled)
> > }
> > }
> >
> > +uint32_t pci_read_config(PCIDevice *d,
> > + uint32_t address, int len)
> > +{
> > + uint32_t val = 0;
> > +
> > + len = MIN(len, pci_config_size(d) - address);
> > + memcpy(&val, d->config + address, len);
> > + return le32_to_cpu(val);
> > +}
> > +
> > uint32_t pci_default_read_config(PCIDevice *d,
> > uint32_t address, int len)
> > {
> > - uint32_t val = 0;
> > assert(len == 1 || len == 2 || len == 4);
> >
> > if (pci_access_cap_config(d, address, len)) {
> > return d->cap.config_read(d, address, len);
> > }
> >
> > - len = MIN(len, pci_config_size(d) - address);
> > - memcpy(&val, d->config + address, len);
> > - return le32_to_cpu(val);
> > + return pci_read_config(d, address, len);
> > }
> >
> > static void pci_write_config(PCIDevice *pci_dev,
> > @@ -1052,7 +1059,7 @@ int pci_access_cap_config(PCIDevice *pci_dev, uint32_t address, int len)
> > uint32_t pci_default_cap_read_config(PCIDevice *pci_dev,
> > uint32_t address, int len)
> > {
> > - return pci_default_read_config(pci_dev, address, len);
> > + return pci_read_config(pci_dev, address, len);
> > }
> >
> > void pci_default_cap_write_config(PCIDevice *pci_dev,
>
> Ok, works. Except for a missing prototype in hw/pci.h :-)
Should just be static in fact. Here's a better one:
diff --git a/hw/pci.c b/hw/pci.c
index 110a5fc..a74d3d4 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -1016,19 +1016,26 @@ static void pci_update_irq_disabled(PCIDevice *d, int was_irq_disabled)
}
}
+static uint32_t pci_read_config(PCIDevice *d,
+ uint32_t address, int len)
+{
+ uint32_t val = 0;
+
+ len = MIN(len, pci_config_size(d) - address);
+ memcpy(&val, d->config + address, len);
+ return le32_to_cpu(val);
+}
+
uint32_t pci_default_read_config(PCIDevice *d,
uint32_t address, int len)
{
- uint32_t val = 0;
assert(len == 1 || len == 2 || len == 4);
if (pci_access_cap_config(d, address, len)) {
return d->cap.config_read(d, address, len);
}
- len = MIN(len, pci_config_size(d) - address);
- memcpy(&val, d->config + address, len);
- return le32_to_cpu(val);
+ return pci_read_config(d, address, len);
}
static void pci_write_config(PCIDevice *pci_dev,
@@ -1052,7 +1059,7 @@ int pci_access_cap_config(PCIDevice *pci_dev, uint32_t address, int len)
uint32_t pci_default_cap_read_config(PCIDevice *pci_dev,
uint32_t address, int len)
{
- return pci_default_read_config(pci_dev, address, len);
+ return pci_read_config(pci_dev, address, len);
}
void pci_default_cap_write_config(PCIDevice *pci_dev,
--
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