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Commit 3701d863 authored by Ingo Molnar's avatar Ingo Molnar Committed by Thomas Gleixner
Browse files

x86: fixup more paravirt fallout 



Use a common irq_return entry point for all the iret places, which
need the paravirt INTERRUPT return wrapper.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 1ec7fd50

arch/x86/kernel/entry_32.S

+6 −9
Original line number Diff line number Diff line
@@ -409,7 +409,8 @@ restore_nocheck_notrace: 
	RESTORE_REGS

	addl $4, %esp			# skip orig_eax/error_code

	CFI_ADJUST_CFA_OFFSET -4

1:	INTERRUPT_RETURN

ENTRY(irq_return)

	INTERRUPT_RETURN

.section .fixup,"ax"

iret_exc:

	pushl $0			# no error code
@@ -418,7 +419,7 @@ iret_exc: 
.previous

.section __ex_table,"a"

	.align 4

	.long 1b,iret_exc

	.long irq_return,iret_exc

.previous



	CFI_RESTORE_STATE
@@ -865,20 +866,16 @@ nmi_espfix_stack: 
	RESTORE_REGS

	lss 12+4(%esp), %esp		# back to espfix stack

	CFI_ADJUST_CFA_OFFSET -24

1:	INTERRUPT_RETURN

	jmp irq_return

	CFI_ENDPROC

.section __ex_table,"a"

	.align 4

	.long 1b,iret_exc

.previous

KPROBE_END(nmi)



#ifdef CONFIG_PARAVIRT

ENTRY(native_iret)

1:	iret

	iret

.section __ex_table,"a"

	.align 4

	.long 1b,iret_exc

	.long native_iret, iret_exc

.previous

END(native_iret)

arch/x86/kernel/entry_64.S

+13 −5
Original line number Diff line number Diff line
@@ -582,15 +582,23 @@ retint_restore_args: /* return to kernel space */ 
	TRACE_IRQS_IRETQ

restore_args:

	RESTORE_ARGS 0,8,0

#ifdef CONFIG_PARAVIRT



ENTRY(irq_return)

	INTERRUPT_RETURN

#endif



	.section __ex_table, "a"

	.quad irq_return, bad_iret

	.previous



#ifdef CONFIG_PARAVIRT

ENTRY(native_iret)

	iretq



	.section __ex_table,"a"

	.quad native_iret, bad_iret

	.previous

#endif



	.section .fixup,"ax"

bad_iret:

	/*
@@ -804,7 +812,7 @@ paranoid_swapgs\trace: 
	SWAPGS_UNSAFE_STACK

paranoid_restore\trace:

	RESTORE_ALL 8

	INTERRUPT_RETURN

	jmp irq_return

paranoid_userspace\trace:

	GET_THREAD_INFO(%rcx)

	movl threadinfo_flags(%rcx),%ebx
@@ -919,7 +927,7 @@ error_kernelspace: 
	   iret run with kernel gs again, so don't set the user space flag.

	   B stepping K8s sometimes report an truncated RIP for IRET 

	   exceptions returning to compat mode. Check for these here too. */

	leaq native_iret(%rip),%rbp

	leaq irq_return(%rip),%rbp

	cmpq %rbp,RIP(%rsp) 

	je   error_swapgs

	movl %ebp,%ebp	/* zero extend */