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[11/17] linux-user: reserve 4GB of vmem for 32-on-64

Message ID 288e65b9eea0c9b3cbe21be46f3e24e4e8b2a090.1333729958.git.riku.voipio@linaro.org
State New
Headers show

Commit Message

Riku Voipio April 6, 2012, 4:35 p.m. UTC 
From: Alexander Graf <agraf@suse.de>

When running 32-on-64 bit guests, we should always reserve as much
virtual memory as we possibly can for the guest process, so it can
never overlap with QEMU address space.

Fortunately we already have the infrastructure for that. All that's
missing is some sane default value to also make use of it!

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
---
 linux-user/main.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
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Patch

diff --git a/linux-user/main.c b/linux-user/main.c
index aa95db3..23ad357 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -48,8 +48,19 @@  unsigned long mmap_min_addr;
 #if defined(CONFIG_USE_GUEST_BASE)
 unsigned long guest_base;
 int have_guest_base;
+#if (TARGET_LONG_BITS == 32) && (HOST_LONG_BITS == 64)
+/*
+ * When running 32-on-64 we should make sure we can fit all of the possible
+ * guest address space into a contiguous chunk of virtual host memory.
+ *
+ * This way we will never overlap with our own libraries or binaries or stack
+ * or anything else that QEMU maps.
+ */
+unsigned long reserved_va = 0xf7000000;
+#else
 unsigned long reserved_va;
 #endif
+#endif
 
 static void usage(void);