summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/security.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel/security.c')
-rw-r--r--arch/powerpc/kernel/security.c506
1 files changed, 431 insertions, 75 deletions
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index bd70f5be1c27..4856e1a5161c 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -7,29 +7,35 @@
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/device.h>
+#include <linux/memblock.h>
+#include <linux/nospec.h>
+#include <linux/prctl.h>
#include <linux/seq_buf.h>
+#include <linux/debugfs.h>
#include <asm/asm-prototypes.h>
#include <asm/code-patching.h>
-#include <asm/debugfs.h>
#include <asm/security_features.h>
+#include <asm/sections.h>
#include <asm/setup.h>
+#include <asm/inst.h>
+#include "setup.h"
u64 powerpc_security_features __read_mostly = SEC_FTR_DEFAULT;
-enum count_cache_flush_type {
- COUNT_CACHE_FLUSH_NONE = 0x1,
- COUNT_CACHE_FLUSH_SW = 0x2,
- COUNT_CACHE_FLUSH_HW = 0x4,
+enum branch_cache_flush_type {
+ BRANCH_CACHE_FLUSH_NONE = 0x1,
+ BRANCH_CACHE_FLUSH_SW = 0x2,
+ BRANCH_CACHE_FLUSH_HW = 0x4,
};
-static enum count_cache_flush_type count_cache_flush_type = COUNT_CACHE_FLUSH_NONE;
-static bool link_stack_flush_enabled;
+static enum branch_cache_flush_type count_cache_flush_type = BRANCH_CACHE_FLUSH_NONE;
+static enum branch_cache_flush_type link_stack_flush_type = BRANCH_CACHE_FLUSH_NONE;
bool barrier_nospec_enabled;
static bool no_nospec;
static bool btb_flush_enabled;
-#if defined(CONFIG_PPC_FSL_BOOK3E) || defined(CONFIG_PPC_BOOK3S_64)
+#if defined(CONFIG_PPC_E500) || defined(CONFIG_PPC_BOOK3S_64)
static bool no_spectrev2;
#endif
@@ -39,7 +45,7 @@ static void enable_barrier_nospec(bool enable)
do_barrier_nospec_fixups(enable);
}
-void setup_barrier_nospec(void)
+void __init setup_barrier_nospec(void)
{
bool enable;
@@ -101,7 +107,7 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_barrier_nospec, barrier_nospec_get,
static __init int barrier_nospec_debugfs_init(void)
{
debugfs_create_file_unsafe("barrier_nospec", 0600,
- powerpc_debugfs_root, NULL,
+ arch_debugfs_dir, NULL,
&fops_barrier_nospec);
return 0;
}
@@ -109,14 +115,14 @@ device_initcall(barrier_nospec_debugfs_init);
static __init int security_feature_debugfs_init(void)
{
- debugfs_create_x64("security_features", 0400, powerpc_debugfs_root,
+ debugfs_create_x64("security_features", 0400, arch_debugfs_dir,
&powerpc_security_features);
return 0;
}
device_initcall(security_feature_debugfs_init);
#endif /* CONFIG_DEBUG_FS */
-#if defined(CONFIG_PPC_FSL_BOOK3E) || defined(CONFIG_PPC_BOOK3S_64)
+#if defined(CONFIG_PPC_E500) || defined(CONFIG_PPC_BOOK3S_64)
static int __init handle_nospectre_v2(char *p)
{
no_spectrev2 = true;
@@ -124,17 +130,17 @@ static int __init handle_nospectre_v2(char *p)
return 0;
}
early_param("nospectre_v2", handle_nospectre_v2);
-#endif /* CONFIG_PPC_FSL_BOOK3E || CONFIG_PPC_BOOK3S_64 */
+#endif /* CONFIG_PPC_E500 || CONFIG_PPC_BOOK3S_64 */
-#ifdef CONFIG_PPC_FSL_BOOK3E
-void setup_spectre_v2(void)
+#ifdef CONFIG_PPC_E500
+void __init setup_spectre_v2(void)
{
if (no_spectrev2 || cpu_mitigations_off())
do_btb_flush_fixups();
else
btb_flush_enabled = true;
}
-#endif /* CONFIG_PPC_FSL_BOOK3E */
+#endif /* CONFIG_PPC_E500 */
#ifdef CONFIG_PPC_BOOK3S_64
ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf)
@@ -216,24 +222,25 @@ ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, c
if (ccd)
seq_buf_printf(&s, "Indirect branch cache disabled");
- if (link_stack_flush_enabled)
- seq_buf_printf(&s, ", Software link stack flush");
-
- } else if (count_cache_flush_type != COUNT_CACHE_FLUSH_NONE) {
+ } else if (count_cache_flush_type != BRANCH_CACHE_FLUSH_NONE) {
seq_buf_printf(&s, "Mitigation: Software count cache flush");
- if (count_cache_flush_type == COUNT_CACHE_FLUSH_HW)
+ if (count_cache_flush_type == BRANCH_CACHE_FLUSH_HW)
seq_buf_printf(&s, " (hardware accelerated)");
- if (link_stack_flush_enabled)
- seq_buf_printf(&s, ", Software link stack flush");
-
} else if (btb_flush_enabled) {
seq_buf_printf(&s, "Mitigation: Branch predictor state flush");
} else {
seq_buf_printf(&s, "Vulnerable");
}
+ if (bcs || ccd || count_cache_flush_type != BRANCH_CACHE_FLUSH_NONE) {
+ if (link_stack_flush_type != BRANCH_CACHE_FLUSH_NONE)
+ seq_buf_printf(&s, ", Software link stack flush");
+ if (link_stack_flush_type == BRANCH_CACHE_FLUSH_HW)
+ seq_buf_printf(&s, " (hardware accelerated)");
+ }
+
seq_buf_printf(&s, "\n");
return s.len;
@@ -246,7 +253,7 @@ ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, c
static enum stf_barrier_type stf_enabled_flush_types;
static bool no_stf_barrier;
-bool stf_barrier;
+static bool stf_barrier;
static int __init handle_no_stf_barrier(char *p)
{
@@ -257,6 +264,11 @@ static int __init handle_no_stf_barrier(char *p)
early_param("no_stf_barrier", handle_no_stf_barrier);
+enum stf_barrier_type stf_barrier_type_get(void)
+{
+ return stf_enabled_flush_types;
+}
+
/* This is the generic flag used by other architectures */
static int __init handle_ssbd(char *p)
{
@@ -294,9 +306,7 @@ static void stf_barrier_enable(bool enable)
void setup_stf_barrier(void)
{
enum stf_barrier_type type;
- bool enable, hv;
-
- hv = cpu_has_feature(CPU_FTR_HVMODE);
+ bool enable;
/* Default to fallback in case fw-features are not available */
if (cpu_has_feature(CPU_FTR_ARCH_300))
@@ -309,8 +319,7 @@ void setup_stf_barrier(void)
type = STF_BARRIER_NONE;
enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
- (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR) ||
- (security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) && hv));
+ security_ftr_enabled(SEC_FTR_STF_BARRIER);
if (type == STF_BARRIER_FALLBACK) {
pr_info("stf-barrier: fallback barrier available\n");
@@ -353,6 +362,41 @@ ssize_t cpu_show_spec_store_bypass(struct device *dev, struct device_attribute *
return sprintf(buf, "Vulnerable\n");
}
+static int ssb_prctl_get(struct task_struct *task)
+{
+ /*
+ * The STF_BARRIER feature is on by default, so if it's off that means
+ * firmware has explicitly said the CPU is not vulnerable via either
+ * the hypercall or device tree.
+ */
+ if (!security_ftr_enabled(SEC_FTR_STF_BARRIER))
+ return PR_SPEC_NOT_AFFECTED;
+
+ /*
+ * If the system's CPU has no known barrier (see setup_stf_barrier())
+ * then assume that the CPU is not vulnerable.
+ */
+ if (stf_enabled_flush_types == STF_BARRIER_NONE)
+ return PR_SPEC_NOT_AFFECTED;
+
+ /*
+ * Otherwise the CPU is vulnerable. The barrier is not a global or
+ * per-process mitigation, so the only value that can be reported here
+ * is PR_SPEC_ENABLE, which appears as "vulnerable" in /proc.
+ */
+ return PR_SPEC_ENABLE;
+}
+
+int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which)
+{
+ switch (which) {
+ case PR_SPEC_STORE_BYPASS:
+ return ssb_prctl_get(task);
+ default:
+ return -ENODEV;
+ }
+}
+
#ifdef CONFIG_DEBUG_FS
static int stf_barrier_set(void *data, u64 val)
{
@@ -383,65 +427,103 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_stf_barrier, stf_barrier_get, stf_barrier_set,
static __init int stf_barrier_debugfs_init(void)
{
- debugfs_create_file_unsafe("stf_barrier", 0600, powerpc_debugfs_root,
+ debugfs_create_file_unsafe("stf_barrier", 0600, arch_debugfs_dir,
NULL, &fops_stf_barrier);
return 0;
}
device_initcall(stf_barrier_debugfs_init);
#endif /* CONFIG_DEBUG_FS */
-static void no_count_cache_flush(void)
+static void update_branch_cache_flush(void)
{
- count_cache_flush_type = COUNT_CACHE_FLUSH_NONE;
- pr_info("count-cache-flush: software flush disabled.\n");
-}
+ u32 *site, __maybe_unused *site2;
-static void toggle_count_cache_flush(bool enable)
-{
- if (!security_ftr_enabled(SEC_FTR_FLUSH_COUNT_CACHE) &&
- !security_ftr_enabled(SEC_FTR_FLUSH_LINK_STACK))
- enable = false;
-
- if (!enable) {
- patch_instruction_site(&patch__call_flush_count_cache, PPC_INST_NOP);
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
- patch_instruction_site(&patch__call_kvm_flush_link_stack, PPC_INST_NOP);
-#endif
- pr_info("link-stack-flush: software flush disabled.\n");
- link_stack_flush_enabled = false;
- no_count_cache_flush();
- return;
+ site = &patch__call_kvm_flush_link_stack;
+ site2 = &patch__call_kvm_flush_link_stack_p9;
+ // This controls the branch from guest_exit_cont to kvm_flush_link_stack
+ if (link_stack_flush_type == BRANCH_CACHE_FLUSH_NONE) {
+ patch_instruction_site(site, ppc_inst(PPC_RAW_NOP()));
+ patch_instruction_site(site2, ppc_inst(PPC_RAW_NOP()));
+ } else {
+ // Could use HW flush, but that could also flush count cache
+ patch_branch_site(site, (u64)&kvm_flush_link_stack, BRANCH_SET_LINK);
+ patch_branch_site(site2, (u64)&kvm_flush_link_stack, BRANCH_SET_LINK);
}
+#endif
- // This enables the branch from _switch to flush_count_cache
- patch_branch_site(&patch__call_flush_count_cache,
- (u64)&flush_count_cache, BRANCH_SET_LINK);
+ // Patch out the bcctr first, then nop the rest
+ site = &patch__call_flush_branch_caches3;
+ patch_instruction_site(site, ppc_inst(PPC_RAW_NOP()));
+ site = &patch__call_flush_branch_caches2;
+ patch_instruction_site(site, ppc_inst(PPC_RAW_NOP()));
+ site = &patch__call_flush_branch_caches1;
+ patch_instruction_site(site, ppc_inst(PPC_RAW_NOP()));
+
+ // This controls the branch from _switch to flush_branch_caches
+ if (count_cache_flush_type == BRANCH_CACHE_FLUSH_NONE &&
+ link_stack_flush_type == BRANCH_CACHE_FLUSH_NONE) {
+ // Nothing to be done
+
+ } else if (count_cache_flush_type == BRANCH_CACHE_FLUSH_HW &&
+ link_stack_flush_type == BRANCH_CACHE_FLUSH_HW) {
+ // Patch in the bcctr last
+ site = &patch__call_flush_branch_caches1;
+ patch_instruction_site(site, ppc_inst(0x39207fff)); // li r9,0x7fff
+ site = &patch__call_flush_branch_caches2;
+ patch_instruction_site(site, ppc_inst(0x7d2903a6)); // mtctr r9
+ site = &patch__call_flush_branch_caches3;
+ patch_instruction_site(site, ppc_inst(PPC_INST_BCCTR_FLUSH));
-#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
- // This enables the branch from guest_exit_cont to kvm_flush_link_stack
- patch_branch_site(&patch__call_kvm_flush_link_stack,
- (u64)&kvm_flush_link_stack, BRANCH_SET_LINK);
-#endif
+ } else {
+ patch_branch_site(site, (u64)&flush_branch_caches, BRANCH_SET_LINK);
- pr_info("link-stack-flush: software flush enabled.\n");
- link_stack_flush_enabled = true;
+ // If we just need to flush the link stack, early return
+ if (count_cache_flush_type == BRANCH_CACHE_FLUSH_NONE) {
+ patch_instruction_site(&patch__flush_link_stack_return,
+ ppc_inst(PPC_RAW_BLR()));
- // If we just need to flush the link stack, patch an early return
- if (!security_ftr_enabled(SEC_FTR_FLUSH_COUNT_CACHE)) {
- patch_instruction_site(&patch__flush_link_stack_return, PPC_INST_BLR);
- no_count_cache_flush();
- return;
+ // If we have flush instruction, early return
+ } else if (count_cache_flush_type == BRANCH_CACHE_FLUSH_HW) {
+ patch_instruction_site(&patch__flush_count_cache_return,
+ ppc_inst(PPC_RAW_BLR()));
+ }
}
+}
- if (!security_ftr_enabled(SEC_FTR_BCCTR_FLUSH_ASSIST)) {
- count_cache_flush_type = COUNT_CACHE_FLUSH_SW;
- pr_info("count-cache-flush: full software flush sequence enabled.\n");
- return;
+static void toggle_branch_cache_flush(bool enable)
+{
+ if (!enable || !security_ftr_enabled(SEC_FTR_FLUSH_COUNT_CACHE)) {
+ if (count_cache_flush_type != BRANCH_CACHE_FLUSH_NONE)
+ count_cache_flush_type = BRANCH_CACHE_FLUSH_NONE;
+
+ pr_info("count-cache-flush: flush disabled.\n");
+ } else {
+ if (security_ftr_enabled(SEC_FTR_BCCTR_FLUSH_ASSIST)) {
+ count_cache_flush_type = BRANCH_CACHE_FLUSH_HW;
+ pr_info("count-cache-flush: hardware flush enabled.\n");
+ } else {
+ count_cache_flush_type = BRANCH_CACHE_FLUSH_SW;
+ pr_info("count-cache-flush: software flush enabled.\n");
+ }
}
- patch_instruction_site(&patch__flush_count_cache_return, PPC_INST_BLR);
- count_cache_flush_type = COUNT_CACHE_FLUSH_HW;
- pr_info("count-cache-flush: hardware assisted flush sequence enabled\n");
+ if (!enable || !security_ftr_enabled(SEC_FTR_FLUSH_LINK_STACK)) {
+ if (link_stack_flush_type != BRANCH_CACHE_FLUSH_NONE)
+ link_stack_flush_type = BRANCH_CACHE_FLUSH_NONE;
+
+ pr_info("link-stack-flush: flush disabled.\n");
+ } else {
+ if (security_ftr_enabled(SEC_FTR_BCCTR_LINK_FLUSH_ASSIST)) {
+ link_stack_flush_type = BRANCH_CACHE_FLUSH_HW;
+ pr_info("link-stack-flush: hardware flush enabled.\n");
+ } else {
+ link_stack_flush_type = BRANCH_CACHE_FLUSH_SW;
+ pr_info("link-stack-flush: software flush enabled.\n");
+ }
+ }
+
+ update_branch_cache_flush();
}
void setup_count_cache_flush(void)
@@ -465,7 +547,179 @@ void setup_count_cache_flush(void)
security_ftr_enabled(SEC_FTR_FLUSH_COUNT_CACHE))
security_ftr_set(SEC_FTR_FLUSH_LINK_STACK);
- toggle_count_cache_flush(enable);
+ toggle_branch_cache_flush(enable);
+}
+
+static enum l1d_flush_type enabled_flush_types;
+static void *l1d_flush_fallback_area;
+static bool no_rfi_flush;
+static bool no_entry_flush;
+static bool no_uaccess_flush;
+bool rfi_flush;
+static bool entry_flush;
+static bool uaccess_flush;
+DEFINE_STATIC_KEY_FALSE(uaccess_flush_key);
+EXPORT_SYMBOL(uaccess_flush_key);
+
+static int __init handle_no_rfi_flush(char *p)
+{
+ pr_info("rfi-flush: disabled on command line.");
+ no_rfi_flush = true;
+ return 0;
+}
+early_param("no_rfi_flush", handle_no_rfi_flush);
+
+static int __init handle_no_entry_flush(char *p)
+{
+ pr_info("entry-flush: disabled on command line.");
+ no_entry_flush = true;
+ return 0;
+}
+early_param("no_entry_flush", handle_no_entry_flush);
+
+static int __init handle_no_uaccess_flush(char *p)
+{
+ pr_info("uaccess-flush: disabled on command line.");
+ no_uaccess_flush = true;
+ return 0;
+}
+early_param("no_uaccess_flush", handle_no_uaccess_flush);
+
+/*
+ * The RFI flush is not KPTI, but because users will see doco that says to use
+ * nopti we hijack that option here to also disable the RFI flush.
+ */
+static int __init handle_no_pti(char *p)
+{
+ pr_info("rfi-flush: disabling due to 'nopti' on command line.\n");
+ handle_no_rfi_flush(NULL);
+ return 0;
+}
+early_param("nopti", handle_no_pti);
+
+static void do_nothing(void *unused)
+{
+ /*
+ * We don't need to do the flush explicitly, just enter+exit kernel is
+ * sufficient, the RFI exit handlers will do the right thing.
+ */
+}
+
+void rfi_flush_enable(bool enable)
+{
+ if (enable) {
+ do_rfi_flush_fixups(enabled_flush_types);
+ on_each_cpu(do_nothing, NULL, 1);
+ } else
+ do_rfi_flush_fixups(L1D_FLUSH_NONE);
+
+ rfi_flush = enable;
+}
+
+static void entry_flush_enable(bool enable)
+{
+ if (enable) {
+ do_entry_flush_fixups(enabled_flush_types);
+ on_each_cpu(do_nothing, NULL, 1);
+ } else {
+ do_entry_flush_fixups(L1D_FLUSH_NONE);
+ }
+
+ entry_flush = enable;
+}
+
+static void uaccess_flush_enable(bool enable)
+{
+ if (enable) {
+ do_uaccess_flush_fixups(enabled_flush_types);
+ static_branch_enable(&uaccess_flush_key);
+ on_each_cpu(do_nothing, NULL, 1);
+ } else {
+ static_branch_disable(&uaccess_flush_key);
+ do_uaccess_flush_fixups(L1D_FLUSH_NONE);
+ }
+
+ uaccess_flush = enable;
+}
+
+static void __ref init_fallback_flush(void)
+{
+ u64 l1d_size, limit;
+ int cpu;
+
+ /* Only allocate the fallback flush area once (at boot time). */
+ if (l1d_flush_fallback_area)
+ return;
+
+ l1d_size = ppc64_caches.l1d.size;
+
+ /*
+ * If there is no d-cache-size property in the device tree, l1d_size
+ * could be zero. That leads to the loop in the asm wrapping around to
+ * 2^64-1, and then walking off the end of the fallback area and
+ * eventually causing a page fault which is fatal. Just default to
+ * something vaguely sane.
+ */
+ if (!l1d_size)
+ l1d_size = (64 * 1024);
+
+ limit = min(ppc64_bolted_size(), ppc64_rma_size);
+
+ /*
+ * Align to L1d size, and size it at 2x L1d size, to catch possible
+ * hardware prefetch runoff. We don't have a recipe for load patterns to
+ * reliably avoid the prefetcher.
+ */
+ l1d_flush_fallback_area = memblock_alloc_try_nid(l1d_size * 2,
+ l1d_size, MEMBLOCK_LOW_LIMIT,
+ limit, NUMA_NO_NODE);
+ if (!l1d_flush_fallback_area)
+ panic("%s: Failed to allocate %llu bytes align=0x%llx max_addr=%pa\n",
+ __func__, l1d_size * 2, l1d_size, &limit);
+
+
+ for_each_possible_cpu(cpu) {
+ struct paca_struct *paca = paca_ptrs[cpu];
+ paca->rfi_flush_fallback_area = l1d_flush_fallback_area;
+ paca->l1d_flush_size = l1d_size;
+ }
+}
+
+void setup_rfi_flush(enum l1d_flush_type types, bool enable)
+{
+ if (types & L1D_FLUSH_FALLBACK) {
+ pr_info("rfi-flush: fallback displacement flush available\n");
+ init_fallback_flush();
+ }
+
+ if (types & L1D_FLUSH_ORI)
+ pr_info("rfi-flush: ori type flush available\n");
+
+ if (types & L1D_FLUSH_MTTRIG)
+ pr_info("rfi-flush: mttrig type flush available\n");
+
+ enabled_flush_types = types;
+
+ if (!cpu_mitigations_off() && !no_rfi_flush)
+ rfi_flush_enable(enable);
+}
+
+void setup_entry_flush(bool enable)
+{
+ if (cpu_mitigations_off())
+ return;
+
+ if (!no_entry_flush)
+ entry_flush_enable(enable);
+}
+
+void setup_uaccess_flush(bool enable)
+{
+ if (cpu_mitigations_off())
+ return;
+
+ if (!no_uaccess_flush)
+ uaccess_flush_enable(enable);
}
#ifdef CONFIG_DEBUG_FS
@@ -480,14 +734,24 @@ static int count_cache_flush_set(void *data, u64 val)
else
return -EINVAL;
- toggle_count_cache_flush(enable);
+ toggle_branch_cache_flush(enable);
return 0;
}
static int count_cache_flush_get(void *data, u64 *val)
{
- if (count_cache_flush_type == COUNT_CACHE_FLUSH_NONE)
+ if (count_cache_flush_type == BRANCH_CACHE_FLUSH_NONE)
+ *val = 0;
+ else
+ *val = 1;
+
+ return 0;
+}
+
+static int link_stack_flush_get(void *data, u64 *val)
+{
+ if (link_stack_flush_type == BRANCH_CACHE_FLUSH_NONE)
*val = 0;
else
*val = 1;
@@ -497,14 +761,106 @@ static int count_cache_flush_get(void *data, u64 *val)
DEFINE_DEBUGFS_ATTRIBUTE(fops_count_cache_flush, count_cache_flush_get,
count_cache_flush_set, "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(fops_link_stack_flush, link_stack_flush_get,
+ count_cache_flush_set, "%llu\n");
static __init int count_cache_flush_debugfs_init(void)
{
debugfs_create_file_unsafe("count_cache_flush", 0600,
- powerpc_debugfs_root, NULL,
+ arch_debugfs_dir, NULL,
&fops_count_cache_flush);
+ debugfs_create_file_unsafe("link_stack_flush", 0600,
+ arch_debugfs_dir, NULL,
+ &fops_link_stack_flush);
return 0;
}
device_initcall(count_cache_flush_debugfs_init);
+
+static int rfi_flush_set(void *data, u64 val)
+{
+ bool enable;
+
+ if (val == 1)
+ enable = true;
+ else if (val == 0)
+ enable = false;
+ else
+ return -EINVAL;
+
+ /* Only do anything if we're changing state */
+ if (enable != rfi_flush)
+ rfi_flush_enable(enable);
+
+ return 0;
+}
+
+static int rfi_flush_get(void *data, u64 *val)
+{
+ *val = rfi_flush ? 1 : 0;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_rfi_flush, rfi_flush_get, rfi_flush_set, "%llu\n");
+
+static int entry_flush_set(void *data, u64 val)
+{
+ bool enable;
+
+ if (val == 1)
+ enable = true;
+ else if (val == 0)
+ enable = false;
+ else
+ return -EINVAL;
+
+ /* Only do anything if we're changing state */
+ if (enable != entry_flush)
+ entry_flush_enable(enable);
+
+ return 0;
+}
+
+static int entry_flush_get(void *data, u64 *val)
+{
+ *val = entry_flush ? 1 : 0;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_entry_flush, entry_flush_get, entry_flush_set, "%llu\n");
+
+static int uaccess_flush_set(void *data, u64 val)
+{
+ bool enable;
+
+ if (val == 1)
+ enable = true;
+ else if (val == 0)
+ enable = false;
+ else
+ return -EINVAL;
+
+ /* Only do anything if we're changing state */
+ if (enable != uaccess_flush)
+ uaccess_flush_enable(enable);
+
+ return 0;
+}
+
+static int uaccess_flush_get(void *data, u64 *val)
+{
+ *val = uaccess_flush ? 1 : 0;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_uaccess_flush, uaccess_flush_get, uaccess_flush_set, "%llu\n");
+
+static __init int rfi_flush_debugfs_init(void)
+{
+ debugfs_create_file("rfi_flush", 0600, arch_debugfs_dir, NULL, &fops_rfi_flush);
+ debugfs_create_file("entry_flush", 0600, arch_debugfs_dir, NULL, &fops_entry_flush);
+ debugfs_create_file("uaccess_flush", 0600, arch_debugfs_dir, NULL, &fops_uaccess_flush);
+ return 0;
+}
+device_initcall(rfi_flush_debugfs_init);
#endif /* CONFIG_DEBUG_FS */
#endif /* CONFIG_PPC_BOOK3S_64 */
generated by cgit (git 2.34.1) at 2024-05-09 07:58:32 +0000