]> git.baikalelectronics.ru Git - kernel.git/commit
x86/fpu: Fix get_xsave_addr() behavior under virtualization
authorHuaitong Han <huaitong.han@intel.com>
Fri, 6 Nov 2015 09:00:23 +0000 (17:00 +0800)
committerIngo Molnar <mingo@kernel.org>
Thu, 12 Nov 2015 08:34:58 +0000 (09:34 +0100)
commit89c11c5164473e18696f091192f2f37533d5a95a
treefffe4e09f04af94b9ae9b23d5604b41448d60192
parentb0086a9a145a7853727d662cd1baf490b1f6399d
x86/fpu: Fix get_xsave_addr() behavior under virtualization

KVM uses the get_xsave_addr() function in a different fashion from
the native kernel, in that the 'xsave' parameter belongs to guest vcpu,
not the currently running task.

But 'xsave' is replaced with current task's (host) xsave structure, so
get_xsave_addr() will incorrectly return the bad xsave address to KVM.

Fix it so that the passed in 'xsave' address is used - as intended
originally.

Signed-off-by: Huaitong Han <huaitong.han@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <stable@vger.kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave.hansen@intel.com
Link: http://lkml.kernel.org/r/1446800423-21622-1-git-send-email-huaitong.han@intel.com
[ Tidied up the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/kernel/fpu/xstate.c