Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull more arm64 updates from Will Deacon:
 "A few late updates to address some issues arising from conflicts with
  other trees:

   - Removal of Qualcomm-specific Spectre-v2 mitigation in favour of the
     generic SMCCC-based firmware call

   - Fix EL2 hardening capability checking, which was bodged to reduce
     conflicts with the KVM tree

   - Add some currently unused assembler macros for managing SIMD
     registers which will be used by some crypto code in the next merge
     window"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: assembler: add macros to conditionally yield the NEON under PREEMPT
  arm64: assembler: add utility macros to push/pop stack frames
  arm64: Move the content of bpi.S to hyp-entry.S
  arm64: Get rid of __smccc_workaround_1_hvc_*
  arm64: capabilities: Rework EL2 vector hardening entry
  arm64: KVM: Use SMCCC_ARCH_WORKAROUND_1 for Falkor BP hardening

3 files changed, 142 insertions, 9 deletions

diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index 053d83e8db6f..0bcc98dbba56 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -565,4 +565,140 @@ USER(\label, ic	ivau, \tmp2)			// invalidate I line PoU
 #endif
 	.endm
 
+	/*
+	 * frame_push - Push @regcount callee saved registers to the stack,
+	 *              starting at x19, as well as x29/x30, and set x29 to
+	 *              the new value of sp. Add @extra bytes of stack space
+	 *              for locals.
+	 */
+	.macro		frame_push, regcount:req, extra
+	__frame		st, \regcount, \extra
+	.endm
+
+	/*
+	 * frame_pop  - Pop the callee saved registers from the stack that were
+	 *              pushed in the most recent call to frame_push, as well
+	 *              as x29/x30 and any extra stack space that may have been
+	 *              allocated.
+	 */
+	.macro		frame_pop
+	__frame		ld
+	.endm
+
+	.macro		__frame_regs, reg1, reg2, op, num
+	.if		.Lframe_regcount == \num
+	\op\()r		\reg1, [sp, #(\num + 1) * 8]
+	.elseif		.Lframe_regcount > \num
+	\op\()p		\reg1, \reg2, [sp, #(\num + 1) * 8]
+	.endif
+	.endm
+
+	.macro		__frame, op, regcount, extra=0
+	.ifc		\op, st
+	.if		(\regcount) < 0 || (\regcount) > 10
+	.error		"regcount should be in the range [0 ... 10]"
+	.endif
+	.if		((\extra) % 16) != 0
+	.error		"extra should be a multiple of 16 bytes"
+	.endif
+	.ifdef		.Lframe_regcount
+	.if		.Lframe_regcount != -1
+	.error		"frame_push/frame_pop may not be nested"
+	.endif
+	.endif
+	.set		.Lframe_regcount, \regcount
+	.set		.Lframe_extra, \extra
+	.set		.Lframe_local_offset, ((\regcount + 3) / 2) * 16
+	stp		x29, x30, [sp, #-.Lframe_local_offset - .Lframe_extra]!
+	mov		x29, sp
+	.endif
+
+	__frame_regs	x19, x20, \op, 1
+	__frame_regs	x21, x22, \op, 3
+	__frame_regs	x23, x24, \op, 5
+	__frame_regs	x25, x26, \op, 7
+	__frame_regs	x27, x28, \op, 9
+
+	.ifc		\op, ld
+	.if		.Lframe_regcount == -1
+	.error		"frame_push/frame_pop may not be nested"
+	.endif
+	ldp		x29, x30, [sp], #.Lframe_local_offset + .Lframe_extra
+	.set		.Lframe_regcount, -1
+	.endif
+	.endm
+
+/*
+ * Check whether to yield to another runnable task from kernel mode NEON code
+ * (which runs with preemption disabled).
+ *
+ * if_will_cond_yield_neon
+ *        // pre-yield patchup code
+ * do_cond_yield_neon
+ *        // post-yield patchup code
+ * endif_yield_neon    <label>
+ *
+ * where <label> is optional, and marks the point where execution will resume
+ * after a yield has been performed. If omitted, execution resumes right after
+ * the endif_yield_neon invocation. Note that the entire sequence, including
+ * the provided patchup code, will be omitted from the image if CONFIG_PREEMPT
+ * is not defined.
+ *
+ * As a convenience, in the case where no patchup code is required, the above
+ * sequence may be abbreviated to
+ *
+ * cond_yield_neon <label>
+ *
+ * Note that the patchup code does not support assembler directives that change
+ * the output section, any use of such directives is undefined.
+ *
+ * The yield itself consists of the following:
+ * - Check whether the preempt count is exactly 1, in which case disabling
+ *   preemption once will make the task preemptible. If this is not the case,
+ *   yielding is pointless.
+ * - Check whether TIF_NEED_RESCHED is set, and if so, disable and re-enable
+ *   kernel mode NEON (which will trigger a reschedule), and branch to the
+ *   yield fixup code.
+ *
+ * This macro sequence may clobber all CPU state that is not guaranteed by the
+ * AAPCS to be preserved across an ordinary function call.
+ */
+
+	.macro		cond_yield_neon, lbl
+	if_will_cond_yield_neon
+	do_cond_yield_neon
+	endif_yield_neon	\lbl
+	.endm
+
+	.macro		if_will_cond_yield_neon
+#ifdef CONFIG_PREEMPT
+	get_thread_info	x0
+	ldr		w1, [x0, #TSK_TI_PREEMPT]
+	ldr		x0, [x0, #TSK_TI_FLAGS]
+	cmp		w1, #PREEMPT_DISABLE_OFFSET
+	csel		x0, x0, xzr, eq
+	tbnz		x0, #TIF_NEED_RESCHED, .Lyield_\@	// needs rescheduling?
+	/* fall through to endif_yield_neon */
+	.subsection	1
+.Lyield_\@ :
+#else
+	.section	".discard.cond_yield_neon", "ax"
+#endif
+	.endm
+
+	.macro		do_cond_yield_neon
+	bl		kernel_neon_end
+	bl		kernel_neon_begin
+	.endm
+
+	.macro		endif_yield_neon, lbl
+	.ifnb		\lbl
+	b		\lbl
+	.else
+	b		.Lyield_out_\@
+	.endif
+	.previous
+.Lyield_out_\@ :
+	.endm
+
 #endif	/* __ASM_ASSEMBLER_H */
diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h
index a311880feb0f..bc51b72fafd4 100644
--- a/arch/arm64/include/asm/cpucaps.h
+++ b/arch/arm64/include/asm/cpucaps.h
@@ -43,13 +43,12 @@
 #define ARM64_SVE				22
 #define ARM64_UNMAP_KERNEL_AT_EL0		23
 #define ARM64_HARDEN_BRANCH_PREDICTOR		24
-#define ARM64_HARDEN_BP_POST_GUEST_EXIT		25
-#define ARM64_HAS_RAS_EXTN			26
-#define ARM64_WORKAROUND_843419			27
-#define ARM64_HAS_CACHE_IDC			28
-#define ARM64_HAS_CACHE_DIC			29
-#define ARM64_HW_DBM				30
+#define ARM64_HAS_RAS_EXTN			25
+#define ARM64_WORKAROUND_843419			26
+#define ARM64_HAS_CACHE_IDC			27
+#define ARM64_HAS_CACHE_DIC			28
+#define ARM64_HW_DBM				29
 
-#define ARM64_NCAPS				31
+#define ARM64_NCAPS				30
 
 #endif /* __ASM_CPUCAPS_H */
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index d53d40704416..f6648a3e4152 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -71,8 +71,6 @@ extern u32 __kvm_get_mdcr_el2(void);
 
 extern u32 __init_stage2_translation(void);
 
-extern void __qcom_hyp_sanitize_btac_predictors(void);
-
 #else /* __ASSEMBLY__ */
 
 .macro get_host_ctxt reg, tmp