Merge tag 'powerpc-5.10-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Some more powerpc fixes for 5.10:

   - regression fix for a boot failure on some 32-bit machines.

   - fix for host crashes in the KVM system reset handling.

   - fix for a possible oops in the KVM XIVE interrupt handling on
     Power9.

   - fix for host crashes triggerable via the KVM emulated MMIO handling
     when running HPT guests.

   - a couple of small build fixes.

  Thanks to Andreas Schwab, Cédric Le Goater, Christophe Leroy, Erhard
  Furtner, Greg Kurz, Greg Kurz, Németh Márton, Nicholas Piggin, Nick
  Desaulniers, Serge Belyshev, and Stephen Rothwell"

* tag 'powerpc-5.10-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64s: Fix allnoconfig build since uaccess flush
  powerpc/64s/exception: KVM Fix for host DSI being taken in HPT guest MMU context
  powerpc: Drop -me200 addition to build flags
  KVM: PPC: Book3S HV: XIVE: Fix possible oops when accessing ESB page
  powerpc/64s: Fix KVM system reset handling when CONFIG_PPC_PSERIES=y
  powerpc/32s: Use relocation offset when setting early hash table

arch/powerpc/Makefile

@@ -248,7 +248,6 @@ KBUILD_CFLAGS		+= $(call cc-option,-mno-string)
 cpu-as-$(CONFIG_40x)		+= -Wa,-m405
 cpu-as-$(CONFIG_44x)		+= -Wa,-m440
 cpu-as-$(CONFIG_ALTIVEC)	+= $(call as-option,-Wa$(comma)-maltivec)
-cpu-as-$(CONFIG_E200)		+= -Wa,-me200
 cpu-as-$(CONFIG_E500)		+= -Wa,-me500
 
 # When using '-many -mpower4' gas will first try and find a matching power4

arch/powerpc/include/asm/book3s/64/kup-radix.h

@@ -63,6 +63,8 @@
 
 #else /* !__ASSEMBLY__ */
 
+#include <linux/jump_label.h>
+
 DECLARE_STATIC_KEY_FALSE(uaccess_flush_key);
 
 #ifdef CONFIG_PPC_KUAP

arch/powerpc/kernel/exceptions-64s.S

@@ -1000,8 +1000,6 @@ TRAMP_REAL_BEGIN(system_reset_idle_wake)
  * Vectors for the FWNMI option.  Share common code.
  */
 TRAMP_REAL_BEGIN(system_reset_fwnmi)
-	/* XXX: fwnmi guest could run a nested/PR guest, so why no test?  */
-	__IKVM_REAL(system_reset)=0
 	GEN_INT_ENTRY system_reset, virt=0
 
 #endif /* CONFIG_PPC_PSERIES */
@@ -1412,6 +1410,11 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
  *   If none is found, do a Linux page fault. Linux page faults can happen in
  *   kernel mode due to user copy operations of course.
  *
+ *   KVM: The KVM HDSI handler may perform a load with MSR[DR]=1 in guest
+ *   MMU context, which may cause a DSI in the host, which must go to the
+ *   KVM handler. MSR[IR] is not enabled, so the real-mode handler will
+ *   always be used regardless of AIL setting.
+ *
  * - Radix MMU
  *   The hardware loads from the Linux page table directly, so a fault goes
  *   immediately to Linux page fault.
@@ -1422,10 +1425,8 @@ INT_DEFINE_BEGIN(data_access)
 	IVEC=0x300
 	IDAR=1
 	IDSISR=1
-#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
 	IKVM_SKIP=1
 	IKVM_REAL=1
-#endif
 INT_DEFINE_END(data_access)
 
 EXC_REAL_BEGIN(data_access, 0x300, 0x80)
@@ -1464,6 +1465,8 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
  *   ppc64_bolted_size (first segment). The kernel handler must avoid stomping
  *   on user-handler data structures.
  *
+ *   KVM: Same as 0x300, DSLB must test for KVM guest.
+ *
  * A dedicated save area EXSLB is used (XXX: but it actually need not be
  * these days, we could use EXGEN).
  */
@@ -1472,10 +1475,8 @@ INT_DEFINE_BEGIN(data_access_slb)
 	IAREA=PACA_EXSLB
 	IRECONCILE=0
 	IDAR=1
-#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
 	IKVM_SKIP=1
 	IKVM_REAL=1
-#endif
 INT_DEFINE_END(data_access_slb)
 
 EXC_REAL_BEGIN(data_access_slb, 0x380, 0x80)

arch/powerpc/kernel/head_book3s_32.S

@@ -156,6 +156,7 @@ __after_mmu_off:
 	bl	initial_bats
 	bl	load_segment_registers
 BEGIN_MMU_FTR_SECTION
+	bl	reloc_offset
 	bl	early_hash_table
 END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
 #if defined(CONFIG_BOOTX_TEXT)
@@ -920,7 +921,7 @@ early_hash_table:
 	ori	r6, r6, 3	/* 256kB table */
 	mtspr	SPRN_SDR1, r6
 	lis	r6, early_hash@h
-	lis	r3, Hash@ha
+	addis	r3, r3, Hash@ha
 	stw	r6, Hash@l(r3)
 	blr
 

arch/powerpc/kvm/book3s_xive_native.c

@@ -251,6 +251,13 @@ static vm_fault_t xive_native_esb_fault(struct vm_fault *vmf)
 	}
 
 	state = &sb->irq_state[src];
+
+	/* Some sanity checking */
+	if (!state->valid) {
+		pr_devel("%s: source %lx invalid !\n", __func__, irq);
+		return VM_FAULT_SIGBUS;
+	}
+
 	kvmppc_xive_select_irq(state, &hw_num, &xd);
 
 	arch_spin_lock(&sb->lock);