From 25b884a83d487fd62c3de7ac1ab5549979188482 Mon Sep 17 00:00:00 2001 From: David Vrabel Date: Fri, 3 Jan 2014 15:46:10 +0000 Subject: [PATCH] x86/xen: set regions above the end of RAM as 1:1 PCI devices may have BARs located above the end of RAM so mark such frames as identity frames in the p2m (instead of the default of missing). PFNs outside the p2m (above MAX_P2M_PFN) are also considered to be identity frames for the same reason. Signed-off-by: David Vrabel Reviewed-by: Konrad Rzeszutek Wilk Tested-by: Konrad Rzeszutek Wilk --- arch/x86/xen/p2m.c | 2 +- arch/x86/xen/setup.c | 9 +++++++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 57001443231e..9bb3d82ffec8 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -507,7 +507,7 @@ unsigned long get_phys_to_machine(unsigned long pfn) unsigned topidx, mididx, idx; if (unlikely(pfn >= MAX_P2M_PFN)) - return INVALID_P2M_ENTRY; + return IDENTITY_FRAME(pfn); topidx = p2m_top_index(pfn); mididx = p2m_mid_index(pfn); diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 2afe55e21d59..210426a26cc0 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -468,6 +468,15 @@ char * __init xen_memory_setup(void) i++; } + /* + * Set the rest as identity mapped, in case PCI BARs are + * located here. + * + * PFNs above MAX_P2M_PFN are considered identity mapped as + * well. + */ + set_phys_range_identity(map[i-1].addr / PAGE_SIZE, ~0ul); + /* * In domU, the ISA region is normal, usable memory, but we * reserve ISA memory anyway because too many things poke -- 2.20.1