2011-12-14 02:35:41 +01:00
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From ac233b323ad7e498c665e8c74df7e44de4a542c0 Mon Sep 17 00:00:00 2001
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From: Alexander Graf <agraf@suse.de>
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Date: Wed, 14 Dec 2011 00:33:28 +0100
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2012-02-01 00:10:40 +01:00
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Subject: [PATCH] linux-user: reserve 4GB of vmem for 32-on-64
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2011-12-14 02:35:41 +01:00
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When running 32-on-64 bit guests, we should always reserve as much
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virtual memory as we possibly can for the guest process, so it can
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never overlap with QEMU address space.
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Fortunately we already have the infrastructure for that. All that's
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missing is some sane default value to also make use of it!
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Signed-off-by: Alexander Graf <agraf@suse.de>
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---
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linux-user/main.c | 11 +++++++++++
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1 files changed, 11 insertions(+), 0 deletions(-)
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diff --git a/linux-user/main.c b/linux-user/main.c
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index 788ff98..3ffee40 100644
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--- a/linux-user/main.c
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+++ b/linux-user/main.c
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@@ -48,8 +48,19 @@ unsigned long mmap_min_addr;
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#if defined(CONFIG_USE_GUEST_BASE)
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unsigned long guest_base;
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int have_guest_base;
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+#if (TARGET_LONG_BITS == 32) && (HOST_LONG_BITS == 64)
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+/*
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+ * When running 32-on-64 we should make sure we can fit all of the possible
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+ * guest address space into a contiguous chunk of virtual host memory.
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+ *
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+ * This way we will never overlap with our own libraries or binaries or stack
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+ * or anything else that QEMU maps.
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+ */
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+unsigned long reserved_va = 0xf7000000;
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+#else
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unsigned long reserved_va;
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#endif
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+#endif
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static void usage(void);
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extern int use_stopflag;
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--
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1.6.0.2
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