[tip: x86/entry] x86/entry: Convert Device not available exception to IDTENTRY

From: tip-bot2 for Thomas Gleixner
Date: Tue May 19 2020 - 16:01:45 EST

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The following commit has been merged into the x86/entry branch of tip:

Commit-ID: 02974050e002189d08d76a7e1d0aa1af74957f01
Gitweb: https://git.kernel.org/tip/02974050e002189d08d76a7e1d0aa1af74957f01
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Tue, 25 Feb 2020 23:16:19 +01:00
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Tue, 19 May 2020 16:03:59 +02:00

x86/entry: Convert Device not available exception to IDTENTRY

Convert #NM to IDTENTRY:
- Implement the C entry point with DEFINE_IDTENTRY
- Emit the ASM stub with DECLARE_IDTENTRY
- Remove the ASM idtentry in 64bit
- Remove the open coded ASM entry code in 32bit
- Fixup the XEN/PV code
- Remove the old prototypes
- Remove the RCU warning as the new entry macro ensures correctness

No functional change.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Alexandre Chartre <alexandre.chartre@xxxxxxxxxx>
Acked-by: Andy Lutomirski <luto@xxxxxxxxxx>
Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20200505134905.056243863@xxxxxxxxxxxxx

---
arch/x86/entry/entry_32.S | 7 -------
arch/x86/entry/entry_64.S | 1 -
arch/x86/include/asm/idtentry.h | 1 +
arch/x86/include/asm/traps.h | 3 ---
arch/x86/kernel/idt.c | 2 +-
arch/x86/kernel/traps.c | 8 ++------
arch/x86/xen/enlighten_pv.c | 2 +-
arch/x86/xen/xen-asm_64.S | 2 +-
8 files changed, 6 insertions(+), 20 deletions(-)

diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index 95a9602..7d7f283 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1311,13 +1311,6 @@ SYM_CODE_START(simd_coprocessor_error)
jmp common_exception
SYM_CODE_END(simd_coprocessor_error)

-SYM_CODE_START(device_not_available)
- ASM_CLAC
- pushl $0
- pushl $do_device_not_available
- jmp common_exception
-SYM_CODE_END(device_not_available)
-
#ifdef CONFIG_PARAVIRT
SYM_CODE_START(native_iret)
iret
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index ebd5f9f..d7cf000 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1073,7 +1073,6 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt smp_irq_work_interrupt
*/

idtentry X86_TRAP_BP int3 do_int3 has_error_code=0
-idtentry X86_TRAP_NM device_not_available do_device_not_available has_error_code=0
idtentry X86_TRAP_OLD_MF coprocessor_segment_overrun do_coprocessor_segment_overrun has_error_code=0
idtentry X86_TRAP_TS invalid_TSS do_invalid_TSS has_error_code=1
idtentry X86_TRAP_NP segment_not_present do_segment_not_present has_error_code=1
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index f34630f..fd6f996 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -81,5 +81,6 @@ DECLARE_IDTENTRY(X86_TRAP_DE, exc_divide_error);
DECLARE_IDTENTRY(X86_TRAP_OF, exc_overflow);
DECLARE_IDTENTRY(X86_TRAP_BR, exc_bounds);
DECLARE_IDTENTRY(X86_TRAP_UD, exc_invalid_op);
+DECLARE_IDTENTRY(X86_TRAP_NM, exc_device_not_available);

#endif
diff --git a/arch/x86/include/asm/traps.h b/arch/x86/include/asm/traps.h
index 71a4a7e..e5f2c90 100644
--- a/arch/x86/include/asm/traps.h
+++ b/arch/x86/include/asm/traps.h
@@ -14,7 +14,6 @@
asmlinkage void debug(void);
asmlinkage void nmi(void);
asmlinkage void int3(void);
-asmlinkage void device_not_available(void);
#ifdef CONFIG_X86_64
asmlinkage void double_fault(void);
#endif
@@ -37,7 +36,6 @@ asmlinkage void simd_coprocessor_error(void);
asmlinkage void xen_xennmi(void);
asmlinkage void xen_xendebug(void);
asmlinkage void xen_int3(void);
-asmlinkage void xen_device_not_available(void);
asmlinkage void xen_double_fault(void);
asmlinkage void xen_coprocessor_segment_overrun(void);
asmlinkage void xen_invalid_TSS(void);
@@ -57,7 +55,6 @@ asmlinkage void xen_simd_coprocessor_error(void);
dotraplinkage void do_debug(struct pt_regs *regs, long error_code);
dotraplinkage void do_nmi(struct pt_regs *regs, long error_code);
dotraplinkage void do_int3(struct pt_regs *regs, long error_code);
-dotraplinkage void do_device_not_available(struct pt_regs *regs, long error_code);
dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsigned long cr2);
dotraplinkage void do_coprocessor_segment_overrun(struct pt_regs *regs, long error_code);
dotraplinkage void do_invalid_TSS(struct pt_regs *regs, long error_code);
diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
index 8b48f54..cdc2d8b 100644
--- a/arch/x86/kernel/idt.c
+++ b/arch/x86/kernel/idt.c
@@ -77,7 +77,7 @@ static const __initconst struct idt_data def_idts[] = {
INTG(X86_TRAP_NMI, nmi),
INTG(X86_TRAP_BR, asm_exc_bounds),
INTG(X86_TRAP_UD, asm_exc_invalid_op),
- INTG(X86_TRAP_NM, device_not_available),
+ INTG(X86_TRAP_NM, asm_exc_device_not_available),
INTG(X86_TRAP_OLD_MF, coprocessor_segment_overrun),
INTG(X86_TRAP_TS, invalid_TSS),
INTG(X86_TRAP_NP, segment_not_present),
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 71ac43d..b8af5eb 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -882,13 +882,10 @@ do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
*/
}

-dotraplinkage void
-do_device_not_available(struct pt_regs *regs, long error_code)
+DEFINE_IDTENTRY(exc_device_not_available)
{
unsigned long cr0 = read_cr0();

- RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
-
#ifdef CONFIG_MATH_EMULATION
if (!boot_cpu_has(X86_FEATURE_FPU) && (cr0 & X86_CR0_EM)) {
struct math_emu_info info = { };
@@ -913,10 +910,9 @@ do_device_not_available(struct pt_regs *regs, long error_code)
* to kill the task than getting stuck in a never-ending
* loop of #NM faults.
*/
- die("unexpected #NM exception", regs, error_code);
+ die("unexpected #NM exception", regs, 0);
}
}
-NOKPROBE_SYMBOL(do_device_not_available);

#ifdef CONFIG_X86_32
dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 87f409a..3ca2abf 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -626,7 +626,7 @@ static struct trap_array_entry trap_array[] = {
TRAP_ENTRY(exc_divide_error, false ),
TRAP_ENTRY(exc_bounds, false ),
TRAP_ENTRY(exc_invalid_op, false ),
- { device_not_available, xen_device_not_available, false },
+ TRAP_ENTRY(exc_device_not_available, false ),
{ coprocessor_segment_overrun, xen_coprocessor_segment_overrun, false },
{ invalid_TSS, xen_invalid_TSS, false },
{ segment_not_present, xen_segment_not_present, false },
diff --git a/arch/x86/xen/xen-asm_64.S b/arch/x86/xen/xen-asm_64.S
index 999f09e..5215e57 100644
--- a/arch/x86/xen/xen-asm_64.S
+++ b/arch/x86/xen/xen-asm_64.S
@@ -36,7 +36,7 @@ xen_pv_trap xennmi
xen_pv_trap asm_exc_overflow
xen_pv_trap asm_exc_bounds
xen_pv_trap asm_exc_invalid_op
-xen_pv_trap device_not_available
+xen_pv_trap asm_exc_device_not_available
xen_pv_trap double_fault
xen_pv_trap coprocessor_segment_overrun
xen_pv_trap invalid_TSS

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