x86/speculation: Fix typo IBRS_ATT, which should be IBRS_ALL

Fixes: 117cc7a ("x86/retpoline: Fill return stack buffer on vmexit")
Signed-off-by: Darren Kenny <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Konrad Rzeszutek Wilk <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: David Woodhouse <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

Author: darrenkenny

arch/x86/include/asm/nospec-branch.h

@@ -150,7 +150,7 @@ extern char __indirect_thunk_end[];
  * On VMEXIT we must ensure that no RSB predictions learned in the guest
  * can be followed in the host, by overwriting the RSB completely. Both
  * retpoline and IBRS mitigations for Spectre v2 need this; only on future
- * CPUs with IBRS_ATT *might* it be avoided.
+ * CPUs with IBRS_ALL *might* it be avoided.
  */
 static inline void vmexit_fill_RSB(void)
 {