Merge tag 'powerpc-5.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:

 - Fix a regression in the conversion of the 64-bit BookE interrupt
   entry to C.

 - Fix KVM hosts running with the hash MMU since the recent KVM gfn
   changes.

 - Fix a deadlock in our paravirt spinlocks when hcall tracing is
   enabled.

 - Several fixes for oopses in our runtime code patching for security
   mitigations.

 - A couple of minor fixes for the recent conversion of 32-bit interrupt
   entry/exit to C.

 - Fix __get_user() causing spurious crashes in sigreturn due to a bad
   inline asm constraint, spotted with GCC 11.

 - A fix for the way we track IRQ masking state vs NMI interrupts when
   using the new scv system call entry path.

 - A couple more minor fixes.

Thanks to Cédric Le Goater, Christian Zigotzky, Christophe Leroy,
Naveen N. Rao, Nicholas Piggin Paul Menzel, and Sean Christopherson.

* tag 'powerpc-5.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64e/interrupt: Fix nvgprs being clobbered
  powerpc/64s: Make NMI record implicitly soft-masked code as irqs disabled
  powerpc/64s: Fix stf mitigation patching w/strict RWX & hash
  powerpc/64s: Fix entry flush patching w/strict RWX & hash
  powerpc/64s: Fix crashes when toggling entry flush barrier
  powerpc/64s: Fix crashes when toggling stf barrier
  KVM: PPC: Book3S HV: Fix kvm_unmap_gfn_range_hv() for Hash MMU
  powerpc/legacy_serial: Fix UBSAN: array-index-out-of-bounds
  powerpc/signal: Fix possible build failure with unsafe_copy_fpr_{to/from}_user
  powerpc/uaccess: Fix __get_user() with CONFIG_CC_HAS_ASM_GOTO_OUTPUT
  powerpc/pseries: warn if recursing into the hcall tracing code
  powerpc/pseries: use notrace hcall variant for H_CEDE idle
  powerpc/pseries: Don't trace hcall tracing wrapper
  powerpc/pseries: Fix hcall tracing recursion in pv queued spinlocks
  powerpc/syscall: Calling kuap_save_and_lock() is wrong
  powerpc/interrupts: Fix kuep_unlock() call

1 files changed, 24 insertions, 14 deletions

diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index 7c3654b0d0f4..f1ae710274bc 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -340,6 +340,12 @@ ret_from_mc_except:
 	andi.	r10,r10,IRQS_DISABLED;	/* yes -> go out of line */ \
 	bne	masked_interrupt_book3e_##n
 
+/*
+ * Additional regs must be re-loaded from paca before EXCEPTION_COMMON* is
+ * called, because that does SAVE_NVGPRS which must see the original register
+ * values, otherwise the scratch values might be restored when exiting the
+ * interrupt.
+ */
 #define PROLOG_ADDITION_2REGS_GEN(n)					    \
 	std	r14,PACA_EXGEN+EX_R14(r13);				    \
 	std	r15,PACA_EXGEN+EX_R15(r13)
@@ -535,6 +541,10 @@ __end_interrupts:
 				PROLOG_ADDITION_2REGS)
 	mfspr	r14,SPRN_DEAR
 	mfspr	r15,SPRN_ESR
+	std	r14,_DAR(r1)
+	std	r15,_DSISR(r1)
+	ld	r14,PACA_EXGEN+EX_R14(r13)
+	ld	r15,PACA_EXGEN+EX_R15(r13)
 	EXCEPTION_COMMON(0x300)
 	b	storage_fault_common
 
@@ -544,6 +554,10 @@ __end_interrupts:
 				PROLOG_ADDITION_2REGS)
 	li	r15,0
 	mr	r14,r10
+	std	r14,_DAR(r1)
+	std	r15,_DSISR(r1)
+	ld	r14,PACA_EXGEN+EX_R14(r13)
+	ld	r15,PACA_EXGEN+EX_R15(r13)
 	EXCEPTION_COMMON(0x400)
 	b	storage_fault_common
 
@@ -557,6 +571,10 @@ __end_interrupts:
 				PROLOG_ADDITION_2REGS)
 	mfspr	r14,SPRN_DEAR
 	mfspr	r15,SPRN_ESR
+	std	r14,_DAR(r1)
+	std	r15,_DSISR(r1)
+	ld	r14,PACA_EXGEN+EX_R14(r13)
+	ld	r15,PACA_EXGEN+EX_R15(r13)
 	EXCEPTION_COMMON(0x600)
 	b	alignment_more	/* no room, go out of line */
 
@@ -565,10 +583,10 @@ __end_interrupts:
 	NORMAL_EXCEPTION_PROLOG(0x700, BOOKE_INTERRUPT_PROGRAM,
 				PROLOG_ADDITION_1REG)
 	mfspr	r14,SPRN_ESR
-	EXCEPTION_COMMON(0x700)
 	std	r14,_DSISR(r1)
-	addi	r3,r1,STACK_FRAME_OVERHEAD
 	ld	r14,PACA_EXGEN+EX_R14(r13)
+	EXCEPTION_COMMON(0x700)
+	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	program_check_exception
 	REST_NVGPRS(r1)
 	b	interrupt_return
@@ -725,11 +743,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
 	 * normal exception
 	 */
 	mfspr	r14,SPRN_DBSR
-	EXCEPTION_COMMON_CRIT(0xd00)
 	std	r14,_DSISR(r1)
-	addi	r3,r1,STACK_FRAME_OVERHEAD
 	ld	r14,PACA_EXCRIT+EX_R14(r13)
 	ld	r15,PACA_EXCRIT+EX_R15(r13)
+	EXCEPTION_COMMON_CRIT(0xd00)
+	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	DebugException
 	REST_NVGPRS(r1)
 	b	interrupt_return
@@ -796,11 +814,11 @@ kernel_dbg_exc:
 	 * normal exception
 	 */
 	mfspr	r14,SPRN_DBSR
-	EXCEPTION_COMMON_DBG(0xd08)
 	std	r14,_DSISR(r1)
-	addi	r3,r1,STACK_FRAME_OVERHEAD
 	ld	r14,PACA_EXDBG+EX_R14(r13)
 	ld	r15,PACA_EXDBG+EX_R15(r13)
+	EXCEPTION_COMMON_DBG(0xd08)
+	addi	r3,r1,STACK_FRAME_OVERHEAD
 	bl	DebugException
 	REST_NVGPRS(r1)
 	b	interrupt_return
@@ -931,11 +949,7 @@ masked_interrupt_book3e_0x2c0:
  * original values stashed away in the PACA
  */
 storage_fault_common:
-	std	r14,_DAR(r1)
-	std	r15,_DSISR(r1)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
-	ld	r14,PACA_EXGEN+EX_R14(r13)
-	ld	r15,PACA_EXGEN+EX_R15(r13)
 	bl	do_page_fault
 	b	interrupt_return
 
@@ -944,11 +958,7 @@ storage_fault_common:
  * continues here.
  */
 alignment_more:
-	std	r14,_DAR(r1)
-	std	r15,_DSISR(r1)
 	addi	r3,r1,STACK_FRAME_OVERHEAD
-	ld	r14,PACA_EXGEN+EX_R14(r13)
-	ld	r15,PACA_EXGEN+EX_R15(r13)
 	bl	alignment_exception
 	REST_NVGPRS(r1)
 	b	interrupt_return