From 358cd9afd069992cf5170f02987011f51a163d1d Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Mon, 12 Jun 2023 09:57:18 +0200 Subject: 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 Signed-off-by: Christoph Hellwig --- arch/x86/xen/setup.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'arch/x86/xen') 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); -- cgit v1.2.3-58-ga151