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pc: pass PCI hole ranges to Guests

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Guest currently has to jump through lots of hoops to guess the PCI hole
ranges.  It's fragile, and makes us change BIOS each time we add a new
chipset.  Let's report the window in a ROM file, to make BIOS do exactly
what QEMU intends.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-05-13 20:00:23 +03:00
parent 3459a62521
commit f8c457b88d
4 changed files with 52 additions and 3 deletions
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26
hw/i386/pc.c
View file

@ -989,6 +989,31 @@ void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge)
}
}
/* pci-info ROM file. Little endian format */
typedef struct PcRomPciInfo {
uint64_t w32_min;
uint64_t w32_max;
uint64_t w64_min;
uint64_t w64_max;
} PcRomPciInfo;
static void pc_fw_cfg_guest_info(PcGuestInfo *guest_info)
{
PcRomPciInfo *info;
if (!guest_info->has_pci_info) {
return;
}
info = g_malloc(sizeof *info);
info->w32_min = cpu_to_le64(guest_info->pci_info.w32.begin);
info->w32_max = cpu_to_le64(guest_info->pci_info.w32.end);
info->w64_min = cpu_to_le64(guest_info->pci_info.w64.begin);
info->w64_max = cpu_to_le64(guest_info->pci_info.w64.end);
/* Pass PCI hole info to guest via a side channel.
* Required so guest PCI enumeration does the right thing. */
fw_cfg_add_file(guest_info->fw_cfg, "etc/pci-info", info, sizeof *info);
}
typedef struct PcGuestInfoState {
PcGuestInfo info;
Notifier machine_done;
@ -1000,6 +1025,7 @@ void pc_guest_info_machine_done(Notifier *notifier, void *data)
PcGuestInfoState *guest_info_state = container_of(notifier,
PcGuestInfoState,
machine_done);
pc_fw_cfg_guest_info(&guest_info_state->info);
}
PcGuestInfo *pc_guest_info_init(ram_addr_t below_4g_mem_size,