From a9b5bff66b2a63f7d0f42434f5da9024b442159c Mon Sep 17 00:00:00 2001 From: David Vrabel Date: Mon, 6 Jan 2014 11:55:13 +0000 Subject: [PATCH] x86/xen: fix set_phys_range_identity() if pfn_e > MAX_P2M_PFN Allow set_phys_range_identity() to work with a range that overlaps MAX_P2M_PFN by clamping pfn_e to MAX_P2M_PFN. Signed-off-by: David Vrabel Reviewed-by: Konrad Rzeszutek Wilk Tested-by: Konrad Rzeszutek Wilk --- arch/x86/xen/p2m.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 4fc71cc1705b..82c8c9305510 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -774,7 +774,7 @@ unsigned long __init set_phys_range_identity(unsigned long pfn_s, { unsigned long pfn; - if (unlikely(pfn_s >= MAX_P2M_PFN || pfn_e >= MAX_P2M_PFN)) + if (unlikely(pfn_s >= MAX_P2M_PFN)) return 0; if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) @@ -783,6 +783,9 @@ unsigned long __init set_phys_range_identity(unsigned long pfn_s, if (pfn_s > pfn_e) return 0; + if (pfn_e > MAX_P2M_PFN) + pfn_e = MAX_P2M_PFN; + for (pfn = (pfn_s & ~(P2M_MID_PER_PAGE * P2M_PER_PAGE - 1)); pfn < ALIGN(pfn_e, (P2M_MID_PER_PAGE * P2M_PER_PAGE)); pfn += P2M_MID_PER_PAGE * P2M_PER_PAGE) -- 2.20.1