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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>
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1 changed files with 4 additions and 3 deletions
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@ -964,11 +964,12 @@ __init void lguest_init(void *boot)
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{
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/* Copy boot parameters first: the Launcher put the physical location
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* in %esi, and head.S converted that to a virtual address and handed
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* it to us. */
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memcpy(&boot_params, boot, PARAM_SIZE);
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* it to us. We use "__memcpy" because "memcpy" sometimes tries to do
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* tricky things to go faster, and we're not ready for that. */
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__memcpy(&boot_params, boot, PARAM_SIZE);
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/* The boot parameters also tell us where the command-line is: save
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* that, too. */
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memcpy(boot_command_line, __va(boot_params.hdr.cmd_line_ptr),
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__memcpy(boot_command_line, __va(boot_params.hdr.cmd_line_ptr),
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COMMAND_LINE_SIZE);
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/* We're under lguest, paravirt is enabled, and we're running at
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