Commit 358cd9af authored by Juergen Gross's avatar Juergen Gross Committed by Christoph Hellwig
Browse files

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: default avatarJuergen Gross <jgross@suse.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 5d0c230f

arch/x86/xen/setup.c

+6 −0
Original line number Diff line number Diff line
@@ -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);

include/xen/xen.h

+6 −0
Original line number Diff line number Diff line
@@ -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);