From cb9e444b5aaa900bb4310da411315b6947c53e37 Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Fri, 4 Sep 2015 14:18:08 +0200 Subject: [PATCH] xen: limit memory to architectural maximum MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit When a pv-domain (including dom0) is started it tries to size it's p2m list according to the maximum possible memory amount it ever can achieve. Limit the initial maximum memory size to the architectural limit of the hardware in order to avoid overflows during remapping of memory. This problem will occur when dom0 is started with an initial memory size being a multiple of 1GB, but without specifying it's maximum memory size. The kernel must be configured without CONFIG_XEN_BALLOON_MEMORY_HOTPLUG for the problem to happen. Reported-by: Roger Pau Monné Tested-by: Roger Pau Monné Signed-off-by: Juergen Gross Signed-off-by: David Vrabel --- arch/x86/xen/setup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 7a5d5666677f..70de4c8b8f27 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -531,7 +531,7 @@ static unsigned long __init xen_get_pages_limit(void) #ifdef CONFIG_X86_32 limit = GB(64) / PAGE_SIZE; #else - limit = ~0ul; + limit = MAXMEM / PAGE_SIZE; if (!xen_initial_domain() && xen_512gb_limit) limit = GB(512) / PAGE_SIZE; #endif -- 2.20.1