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| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-09-11 17:06:37 +1000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-09-12 12:19:46 -0700 |
| commit | c413fecc763e380ec93dc6faf726e7e735ade04e (patch) | |
| tree | deadc5f49c90dbe41081f2ca472a6b03a105de08 | |
| parent | 9863b78a1a82347fa1e727bdca0110151a5c4f10 (diff) | |
| download | blackbird-obmc-linux-c413fecc763e380ec93dc6faf726e7e735ade04e.tar.gz blackbird-obmc-linux-c413fecc763e380ec93dc6faf726e7e735ade04e.zip | |
lguest: Fix guest crash when CONFIG_X86_USE_3DNOW=y
One of the very first things lguest_init() does is a memcpy. On
Athlon/Duron/K7 or CyrixIII/VIA-C3 or Geode GX/LX, this tries to use
MMX.
memcpy -> _mmx_memcpy -> kernel_fpu_begin -> clts -> paravirt_ops.clts
But we haven't set paravirt_ops.clts yet, so we do the native version
and crash. The simplest solution is to use __memcpy.
Thanks to Michael Rasenberger for the bug report.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/lguest/lguest.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/lguest/lguest.c b/drivers/lguest/lguest.c index 6e135ac0834f..ee1c6d05c3d3 100644 --- a/drivers/lguest/lguest.c +++ b/drivers/lguest/lguest.c @@ -964,11 +964,12 @@ __init void lguest_init(void *boot) { /* Copy boot parameters first: the Launcher put the physical location * in %esi, and head.S converted that to a virtual address and handed - * it to us. */ - memcpy(&boot_params, boot, PARAM_SIZE); + * it to us. We use "__memcpy" because "memcpy" sometimes tries to do + * tricky things to go faster, and we're not ready for that. */ + __memcpy(&boot_params, boot, PARAM_SIZE); /* The boot parameters also tell us where the command-line is: save * that, too. */ - memcpy(boot_command_line, __va(boot_params.hdr.cmd_line_ptr), + __memcpy(boot_command_line, __va(boot_params.hdr.cmd_line_ptr), COMMAND_LINE_SIZE); /* We're under lguest, paravirt is enabled, and we're running at |
