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| author |   Juergen Gross <jgross@suse.com> | 2023-06-12 09:57:18 +0200 |
|---|---|---|
| committer |   Christoph Hellwig <hch@lst.de> | 2023-07-31 17:54:27 +0200 |
| commit | 358cd9afd069992cf5170f02987011f51a163d1d (patch) | |
| tree | 213d02f2e0e632e66e0d31ea1ed7065a3bac2955 | |
| parent | Linux 6.5-rc4 (diff) | |
| download | wireguard-linux-358cd9afd069992cf5170f02987011f51a163d1d.tar.xz wireguard-linux-358cd9afd069992cf5170f02987011f51a163d1d.zip | |
xen/pci: add flag for PCI passthrough being possible
When running as a Xen PV guests passed through PCI devices only have a
chance to work if the Xen supplied memory map has some PCI space
reserved.
Add a flag xen_pv_pci_possible which will be set in early boot in case
the memory map has at least one area with the type E820_TYPE_RESERVED.
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
| -rw-r--r-- | arch/x86/xen/setup.c | 6 | ||||
| -rw-r--r-- | include/xen/xen.h | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 8b5cf7bb1f47..e6c796a9d499 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -44,6 +44,9 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata; /* Number of pages released from the initial allocation. */ unsigned long xen_released_pages; +/* Memory map would allow PCI passthrough. */ +bool xen_pv_pci_possible; + /* E820 map used during setting up memory. */ static struct e820_table xen_e820_table __initdata; @@ -814,6 +817,9 @@ char * __init xen_memory_setup(void) chunk_size = size; type = xen_e820_table.entries[i].type; + if (type == E820_TYPE_RESERVED) + xen_pv_pci_possible = true; + if (type == E820_TYPE_RAM) { if (addr < mem_end) { chunk_size = min(size, mem_end - addr); diff --git a/include/xen/xen.h b/include/xen/xen.h index f989162983c3..a1e5b3f18d69 100644 --- a/include/xen/xen.h +++ b/include/xen/xen.h @@ -29,6 +29,12 @@ extern bool xen_pvh; extern uint32_t xen_start_flags; +#ifdef CONFIG_XEN_PV +extern bool xen_pv_pci_possible; +#else +#define xen_pv_pci_possible 0 +#endif + #include <xen/interface/hvm/start_info.h> extern struct hvm_start_info pvh_start_info; void xen_prepare_pvh(void); |