arm64: trap userspace "dc cvau" cache operation on errata-affected core

The ARM errata 819472, 826319, 827319 and 824069 for affected
Cortex-A53 cores demand to promote "dc cvau" instructions to
"dc civac". Since we allow userspace to also emit those instructions,
we should make sure that "dc cvau" gets promoted there too.
So lets grasp the nettle here and actually trap every userland cache
maintenance instruction once we detect at least one affected core in
the system.
We then emulate the instruction by executing it on behalf of userland,
promoting "dc cvau" to "dc civac" on the way and injecting access
fault back into userspace.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
[catalin.marinas@arm.com: s/set_segfault/arm64_notify_segfault/]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

3 files changed, 73 insertions, 1 deletions

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index c2261a7..af647d2 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -46,6 +46,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
 		.desc = "ARM errata 826319, 827319, 824069",
 		.capability = ARM64_WORKAROUND_CLEAN_CACHE,
 		MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x02),
+		.enable = cpu_enable_cache_maint_trap,
 	},
 #endif
 #ifdef CONFIG_ARM64_ERRATUM_819472
@@ -54,6 +55,7 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
 		.desc = "ARM errata 819472",
 		.capability = ARM64_WORKAROUND_CLEAN_CACHE,
 		MIDR_RANGE(MIDR_CORTEX_A53, 0x00, 0x01),
+		.enable = cpu_enable_cache_maint_trap,
 	},
 #endif
 #ifdef CONFIG_ARM64_ERRATUM_832075
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index eefffa8..3eca5d3 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -451,7 +451,7 @@ el0_sync:
 	cmp	x24, #ESR_ELx_EC_FP_EXC64	// FP/ASIMD exception
 	b.eq	el0_fpsimd_exc
 	cmp	x24, #ESR_ELx_EC_SYS64		// configurable trap
-	b.eq	el0_undef
+	b.eq	el0_sys
 	cmp	x24, #ESR_ELx_EC_SP_ALIGN	// stack alignment exception
 	b.eq	el0_sp_pc
 	cmp	x24, #ESR_ELx_EC_PC_ALIGN	// pc alignment exception
@@ -579,6 +579,16 @@ el0_undef:
 	mov	x0, sp
 	bl	do_undefinstr
 	b	ret_to_user
+el0_sys:
+	/*
+	 * System instructions, for trapped cache maintenance instructions
+	 */
+	enable_dbg_and_irq
+	ct_user_exit
+	mov	x0, x25
+	mov	x1, sp
+	bl	do_sysinstr
+	b	ret_to_user
 el0_dbg:
 	/*
 	 * Debug exception handling
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index d8a5366..e04f838 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -41,6 +41,7 @@
 #include <asm/stacktrace.h>
 #include <asm/exception.h>
 #include <asm/system_misc.h>
+#include <asm/sysreg.h>
 
 static const char *handler[]= {
 	"Synchronous Abort",
@@ -427,6 +428,65 @@ asmlinkage void __exception do_undefinstr(struct pt_regs *regs)
 	force_signal_inject(SIGILL, ILL_ILLOPC, regs, 0);
 }
 
+void cpu_enable_cache_maint_trap(void *__unused)
+{
+	config_sctlr_el1(SCTLR_EL1_UCI, 0);
+}
+
+#define __user_cache_maint(insn, address, res)			\
+	asm volatile (						\
+		"1:	" insn ", %1\n"				\
+		"	mov	%w0, #0\n"			\
+		"2:\n"						\
+		"	.pushsection .fixup,\"ax\"\n"		\
+		"	.align	2\n"				\
+		"3:	mov	%w0, %w2\n"			\
+		"	b	2b\n"				\
+		"	.popsection\n"				\
+		_ASM_EXTABLE(1b, 3b)				\
+		: "=r" (res)					\
+		: "r" (address), "i" (-EFAULT) )
+
+asmlinkage void __exception do_sysinstr(unsigned int esr, struct pt_regs *regs)
+{
+	unsigned long address;
+	int ret;
+
+	/* if this is a write with: Op0=1, Op2=1, Op1=3, CRn=7 */
+	if ((esr & 0x01fffc01) == 0x0012dc00) {
+		int rt = (esr >> 5) & 0x1f;
+		int crm = (esr >> 1) & 0x0f;
+
+		address = (rt == 31) ? 0 : regs->regs[rt];
+
+		switch (crm) {
+		case 11:		/* DC CVAU, gets promoted */
+			__user_cache_maint("dc civac", address, ret);
+			break;
+		case 10:		/* DC CVAC, gets promoted */
+			__user_cache_maint("dc civac", address, ret);
+			break;
+		case 14:		/* DC CIVAC */
+			__user_cache_maint("dc civac", address, ret);
+			break;
+		case 5:			/* IC IVAU */
+			__user_cache_maint("ic ivau", address, ret);
+			break;
+		default:
+			force_signal_inject(SIGILL, ILL_ILLOPC, regs, 0);
+			return;
+		}
+	} else {
+		force_signal_inject(SIGILL, ILL_ILLOPC, regs, 0);
+		return;
+	}
+
+	if (ret)
+		arm64_notify_segfault(regs, address);
+	else
+		regs->pc += 4;
+}
+
 long compat_arm_syscall(struct pt_regs *regs);
 
 asmlinkage long do_ni_syscall(struct pt_regs *regs)