1 files changed, 0 insertions, 321 deletions
diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c
deleted file mode 100644
index 1b0542c69738..000000000000
--- a/arch/arm64/kernel/idreg-override.c
+++ /dev/null
@@ -1,321 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Early cpufeature override framework
- *
- * Copyright (C) 2020 Google LLC
- * Author: Marc Zyngier <maz@kernel.org>
- */
-
-#include <linux/ctype.h>
-#include <linux/kernel.h>
-#include <linux/libfdt.h>
-
-#include <asm/cacheflush.h>
-#include <asm/cpufeature.h>
-#include <asm/setup.h>
-
-#define FTR_DESC_NAME_LEN	20
-#define FTR_DESC_FIELD_LEN	10
-#define FTR_ALIAS_NAME_LEN	30
-#define FTR_ALIAS_OPTION_LEN	116
-
-static u64 __boot_status __initdata;
-
-struct ftr_set_desc {
-	char 				name[FTR_DESC_NAME_LEN];
-	struct arm64_ftr_override	*override;
-	struct {
-		char			name[FTR_DESC_FIELD_LEN];
-		u8			shift;
-		u8			width;
-		bool			(*filter)(u64 val);
-	} 				fields[];
-};
-
-#define FIELD(n, s, f)	{ .name = n, .shift = s, .width = 4, .filter = f }
-
-static bool __init mmfr1_vh_filter(u64 val)
-{
-	/*
-	 * If we ever reach this point while running VHE, we're
-	 * guaranteed to be on one of these funky, VHE-stuck CPUs. If
-	 * the user was trying to force nVHE on us, proceed with
-	 * attitude adjustment.
-	 */
-	return !(__boot_status == (BOOT_CPU_FLAG_E2H | BOOT_CPU_MODE_EL2) &&
-		 val == 0);
-}
-
-static const struct ftr_set_desc mmfr1 __initconst = {
-	.name		= "id_aa64mmfr1",
-	.override	= &id_aa64mmfr1_override,
-	.fields		= {
-		FIELD("vh", ID_AA64MMFR1_VHE_SHIFT, mmfr1_vh_filter),
-		{}
-	},
-};
-
-static bool __init pfr0_sve_filter(u64 val)
-{
-	/*
-	 * Disabling SVE also means disabling all the features that
-	 * are associated with it. The easiest way to do it is just to
-	 * override id_aa64zfr0_el1 to be 0.
-	 */
-	if (!val) {
-		id_aa64zfr0_override.val = 0;
-		id_aa64zfr0_override.mask = GENMASK(63, 0);
-	}
-
-	return true;
-}
-
-static const struct ftr_set_desc pfr0 __initconst = {
-	.name		= "id_aa64pfr0",
-	.override	= &id_aa64pfr0_override,
-	.fields		= {
-	        FIELD("sve", ID_AA64PFR0_SVE_SHIFT, pfr0_sve_filter),
-		{}
-	},
-};
-
-static bool __init pfr1_sme_filter(u64 val)
-{
-	/*
-	 * Similarly to SVE, disabling SME also means disabling all
-	 * the features that are associated with it. Just set
-	 * id_aa64smfr0_el1 to 0 and don't look back.
-	 */
-	if (!val) {
-		id_aa64smfr0_override.val = 0;
-		id_aa64smfr0_override.mask = GENMASK(63, 0);
-	}
-
-	return true;
-}
-
-static const struct ftr_set_desc pfr1 __initconst = {
-	.name		= "id_aa64pfr1",
-	.override	= &id_aa64pfr1_override,
-	.fields		= {
-		FIELD("bt", ID_AA64PFR1_BT_SHIFT, NULL ),
-		FIELD("mte", ID_AA64PFR1_MTE_SHIFT, NULL),
-		FIELD("sme", ID_AA64PFR1_SME_SHIFT, pfr1_sme_filter),
-		{}
-	},
-};
-
-static const struct ftr_set_desc isar1 __initconst = {
-	.name		= "id_aa64isar1",
-	.override	= &id_aa64isar1_override,
-	.fields		= {
-		FIELD("gpi", ID_AA64ISAR1_EL1_GPI_SHIFT, NULL),
-		FIELD("gpa", ID_AA64ISAR1_EL1_GPA_SHIFT, NULL),
-		FIELD("api", ID_AA64ISAR1_EL1_API_SHIFT, NULL),
-		FIELD("apa", ID_AA64ISAR1_EL1_APA_SHIFT, NULL),
-		{}
-	},
-};
-
-static const struct ftr_set_desc isar2 __initconst = {
-	.name		= "id_aa64isar2",
-	.override	= &id_aa64isar2_override,
-	.fields		= {
-		FIELD("gpa3", ID_AA64ISAR2_EL1_GPA3_SHIFT, NULL),
-		FIELD("apa3", ID_AA64ISAR2_EL1_APA3_SHIFT, NULL),
-		{}
-	},
-};
-
-static const struct ftr_set_desc smfr0 __initconst = {
-	.name		= "id_aa64smfr0",
-	.override	= &id_aa64smfr0_override,
-	.fields		= {
-		/* FA64 is a one bit field... :-/ */
-		{ "fa64", ID_AA64SMFR0_EL1_FA64_SHIFT, 1, },
-		{}
-	},
-};
-
-extern struct arm64_ftr_override kaslr_feature_override;
-
-static const struct ftr_set_desc kaslr __initconst = {
-	.name		= "kaslr",
-#ifdef CONFIG_RANDOMIZE_BASE
-	.override	= &kaslr_feature_override,
-#endif
-	.fields		= {
-		FIELD("disabled", 0, NULL),
-		{}
-	},
-};
-
-static const struct ftr_set_desc * const regs[] __initconst = {
-	&mmfr1,
-	&pfr0,
-	&pfr1,
-	&isar1,
-	&isar2,
-	&smfr0,
-	&kaslr,
-};
-
-static const struct {
-	char	alias[FTR_ALIAS_NAME_LEN];
-	char	feature[FTR_ALIAS_OPTION_LEN];
-} aliases[] __initconst = {
-	{ "kvm-arm.mode=nvhe",		"id_aa64mmfr1.vh=0" },
-	{ "kvm-arm.mode=protected",	"id_aa64mmfr1.vh=0" },
-	{ "arm64.nosve",		"id_aa64pfr0.sve=0 id_aa64pfr1.sme=0" },
-	{ "arm64.nosme",		"id_aa64pfr1.sme=0" },
-	{ "arm64.nobti",		"id_aa64pfr1.bt=0" },
-	{ "arm64.nopauth",
-	  "id_aa64isar1.gpi=0 id_aa64isar1.gpa=0 "
-	  "id_aa64isar1.api=0 id_aa64isar1.apa=0 "
-	  "id_aa64isar2.gpa3=0 id_aa64isar2.apa3=0"	   },
-	{ "arm64.nomte",		"id_aa64pfr1.mte=0" },
-	{ "nokaslr",			"kaslr.disabled=1" },
-};
-
-static int __init find_field(const char *cmdline,
-			     const struct ftr_set_desc *reg, int f, u64 *v)
-{
-	char opt[FTR_DESC_NAME_LEN + FTR_DESC_FIELD_LEN + 2];
-	int len;
-
-	len = snprintf(opt, ARRAY_SIZE(opt), "%s.%s=",
-		       reg->name, reg->fields[f].name);
-
-	if (!parameqn(cmdline, opt, len))
-		return -1;
-
-	return kstrtou64(cmdline + len, 0, v);
-}
-
-static void __init match_options(const char *cmdline)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(regs); i++) {
-		int f;
-
-		if (!regs[i]->override)
-			continue;
-
-		for (f = 0; strlen(regs[i]->fields[f].name); f++) {
-			u64 shift = regs[i]->fields[f].shift;
-			u64 width = regs[i]->fields[f].width ?: 4;
-			u64 mask = GENMASK_ULL(shift + width - 1, shift);
-			u64 v;
-
-			if (find_field(cmdline, regs[i], f, &v))
-				continue;
-
-			/*
-			 * If an override gets filtered out, advertise
-			 * it by setting the value to the all-ones while
-			 * clearing the mask... Yes, this is fragile.
-			 */
-			if (regs[i]->fields[f].filter &&
-			    !regs[i]->fields[f].filter(v)) {
-				regs[i]->override->val  |= mask;
-				regs[i]->override->mask &= ~mask;
-				continue;
-			}
-
-			regs[i]->override->val  &= ~mask;
-			regs[i]->override->val  |= (v << shift) & mask;
-			regs[i]->override->mask |= mask;
-
-			return;
-		}
-	}
-}
-
-static __init void __parse_cmdline(const char *cmdline, bool parse_aliases)
-{
-	do {
-		char buf[256];
-		size_t len;
-		int i;
-
-		cmdline = skip_spaces(cmdline);
-
-		for (len = 0; cmdline[len] && !isspace(cmdline[len]); len++);
-		if (!len)
-			return;
-
-		len = min(len, ARRAY_SIZE(buf) - 1);
-		strncpy(buf, cmdline, len);
-		buf[len] = 0;
-
-		if (strcmp(buf, "--") == 0)
-			return;
-
-		cmdline += len;
-
-		match_options(buf);
-
-		for (i = 0; parse_aliases && i < ARRAY_SIZE(aliases); i++)
-			if (parameq(buf, aliases[i].alias))
-				__parse_cmdline(aliases[i].feature, false);
-	} while (1);
-}
-
-static __init const u8 *get_bootargs_cmdline(void)
-{
-	const u8 *prop;
-	void *fdt;
-	int node;
-
-	fdt = get_early_fdt_ptr();
-	if (!fdt)
-		return NULL;
-
-	node = fdt_path_offset(fdt, "/chosen");
-	if (node < 0)
-		return NULL;
-
-	prop = fdt_getprop(fdt, node, "bootargs", NULL);
-	if (!prop)
-		return NULL;
-
-	return strlen(prop) ? prop : NULL;
-}
-
-static __init void parse_cmdline(void)
-{
-	const u8 *prop = get_bootargs_cmdline();
-
-	if (IS_ENABLED(CONFIG_CMDLINE_FORCE) || !prop)
-		__parse_cmdline(CONFIG_CMDLINE, true);
-
-	if (!IS_ENABLED(CONFIG_CMDLINE_FORCE) && prop)
-		__parse_cmdline(prop, true);
-}
-
-/* Keep checkers quiet */
-void init_feature_override(u64 boot_status);
-
-asmlinkage void __init init_feature_override(u64 boot_status)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(regs); i++) {
-		if (regs[i]->override) {
-			regs[i]->override->val  = 0;
-			regs[i]->override->mask = 0;
-		}
-	}
-
-	__boot_status = boot_status;
-
-	parse_cmdline();
-
-	for (i = 0; i < ARRAY_SIZE(regs); i++) {
-		if (regs[i]->override)
-			dcache_clean_inval_poc((unsigned long)regs[i]->override,
-					    (unsigned long)regs[i]->override +
-					    sizeof(*regs[i]->override));
-	}
-}