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-rw-r--r--arch/x86/platform/efi/efi_32.c12
-rw-r--r--arch/x86/platform/efi/efi_64.c19
-rw-r--r--arch/x86/platform/uv/uv_nmi.c104
-rw-r--r--arch/x86/platform/uv/uv_time.c2
4 files changed, 87 insertions, 50 deletions
diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c
index e06a199423c0..b2cc7b4552a1 100644
--- a/arch/x86/platform/efi/efi_32.c
+++ b/arch/x86/platform/efi/efi_32.c
@@ -140,3 +140,15 @@ void __init efi_runtime_update_mappings(void)
}
}
}
+
+void arch_efi_call_virt_setup(void)
+{
+ efi_fpu_begin();
+ firmware_restrict_branch_speculation_start();
+}
+
+void arch_efi_call_virt_teardown(void)
+{
+ firmware_restrict_branch_speculation_end();
+ efi_fpu_end();
+}
diff --git a/arch/x86/platform/efi/efi_64.c b/arch/x86/platform/efi/efi_64.c
index 77f7ac3668cb..91d31ac422d6 100644
--- a/arch/x86/platform/efi/efi_64.c
+++ b/arch/x86/platform/efi/efi_64.c
@@ -474,19 +474,34 @@ void __init efi_dump_pagetable(void)
* can not change under us.
* It should be ensured that there are no concurrent calls to this function.
*/
-void efi_enter_mm(void)
+static void efi_enter_mm(void)
{
efi_prev_mm = current->active_mm;
current->active_mm = &efi_mm;
switch_mm(efi_prev_mm, &efi_mm, NULL);
}
-void efi_leave_mm(void)
+static void efi_leave_mm(void)
{
current->active_mm = efi_prev_mm;
switch_mm(&efi_mm, efi_prev_mm, NULL);
}
+void arch_efi_call_virt_setup(void)
+{
+ efi_sync_low_kernel_mappings();
+ efi_fpu_begin();
+ firmware_restrict_branch_speculation_start();
+ efi_enter_mm();
+}
+
+void arch_efi_call_virt_teardown(void)
+{
+ efi_leave_mm();
+ firmware_restrict_branch_speculation_end();
+ efi_fpu_end();
+}
+
static DEFINE_SPINLOCK(efi_runtime_lock);
/*
diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c
index 45d0c17ce77c..e03207de2880 100644
--- a/arch/x86/platform/uv/uv_nmi.c
+++ b/arch/x86/platform/uv/uv_nmi.c
@@ -17,6 +17,7 @@
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/slab.h>
+#include <linux/string.h>
#include <linux/clocksource.h>
#include <asm/apic.h>
@@ -178,49 +179,56 @@ module_param_named(debug, uv_nmi_debug, int, 0644);
} while (0)
/* Valid NMI Actions */
-#define ACTION_LEN 16
-static struct nmi_action {
- char *action;
- char *desc;
-} valid_acts[] = {
- { "kdump", "do kernel crash dump" },
- { "dump", "dump process stack for each cpu" },
- { "ips", "dump Inst Ptr info for each cpu" },
- { "kdb", "enter KDB (needs kgdboc= assignment)" },
- { "kgdb", "enter KGDB (needs gdb target remote)" },
- { "health", "check if CPUs respond to NMI" },
+enum action_t {
+ nmi_act_kdump,
+ nmi_act_dump,
+ nmi_act_ips,
+ nmi_act_kdb,
+ nmi_act_kgdb,
+ nmi_act_health,
+ nmi_act_max
};
-typedef char action_t[ACTION_LEN];
-static action_t uv_nmi_action = { "dump" };
+
+static const char * const actions[nmi_act_max] = {
+ [nmi_act_kdump] = "kdump",
+ [nmi_act_dump] = "dump",
+ [nmi_act_ips] = "ips",
+ [nmi_act_kdb] = "kdb",
+ [nmi_act_kgdb] = "kgdb",
+ [nmi_act_health] = "health",
+};
+
+static const char * const actions_desc[nmi_act_max] = {
+ [nmi_act_kdump] = "do kernel crash dump",
+ [nmi_act_dump] = "dump process stack for each cpu",
+ [nmi_act_ips] = "dump Inst Ptr info for each cpu",
+ [nmi_act_kdb] = "enter KDB (needs kgdboc= assignment)",
+ [nmi_act_kgdb] = "enter KGDB (needs gdb target remote)",
+ [nmi_act_health] = "check if CPUs respond to NMI",
+};
+
+static enum action_t uv_nmi_action = nmi_act_dump;
static int param_get_action(char *buffer, const struct kernel_param *kp)
{
- return sprintf(buffer, "%s\n", uv_nmi_action);
+ return sprintf(buffer, "%s\n", actions[uv_nmi_action]);
}
static int param_set_action(const char *val, const struct kernel_param *kp)
{
- int i;
- int n = ARRAY_SIZE(valid_acts);
- char arg[ACTION_LEN];
-
- /* (remove possible '\n') */
- strscpy(arg, val, strnchrnul(val, sizeof(arg)-1, '\n') - val + 1);
-
- for (i = 0; i < n; i++)
- if (!strcmp(arg, valid_acts[i].action))
- break;
+ int i, n = ARRAY_SIZE(actions);
- if (i < n) {
- strscpy(uv_nmi_action, arg, sizeof(uv_nmi_action));
- pr_info("UV: New NMI action:%s\n", uv_nmi_action);
+ i = sysfs_match_string(actions, val);
+ if (i >= 0) {
+ uv_nmi_action = i;
+ pr_info("UV: New NMI action:%s\n", actions[i]);
return 0;
}
- pr_err("UV: Invalid NMI action:%s, valid actions are:\n", arg);
+ pr_err("UV: Invalid NMI action. Valid actions are:\n");
for (i = 0; i < n; i++)
- pr_err("UV: %-8s - %s\n",
- valid_acts[i].action, valid_acts[i].desc);
+ pr_err("UV: %-8s - %s\n", actions[i], actions_desc[i]);
+
return -EINVAL;
}
@@ -228,15 +236,10 @@ static const struct kernel_param_ops param_ops_action = {
.get = param_get_action,
.set = param_set_action,
};
-#define param_check_action(name, p) __param_check(name, p, action_t)
+#define param_check_action(name, p) __param_check(name, p, enum action_t)
module_param_named(action, uv_nmi_action, action, 0644);
-static inline bool uv_nmi_action_is(const char *action)
-{
- return (strncmp(uv_nmi_action, action, strlen(action)) == 0);
-}
-
/* Setup which NMI support is present in system */
static void uv_nmi_setup_mmrs(void)
{
@@ -727,10 +730,10 @@ static void uv_nmi_dump_state_cpu(int cpu, struct pt_regs *regs)
if (cpu == 0)
uv_nmi_dump_cpu_ip_hdr();
- if (current->pid != 0 || !uv_nmi_action_is("ips"))
+ if (current->pid != 0 || uv_nmi_action != nmi_act_ips)
uv_nmi_dump_cpu_ip(cpu, regs);
- if (uv_nmi_action_is("dump")) {
+ if (uv_nmi_action == nmi_act_dump) {
pr_info("UV:%sNMI process trace for CPU %d\n", dots, cpu);
show_regs(regs);
}
@@ -798,7 +801,7 @@ static void uv_nmi_dump_state(int cpu, struct pt_regs *regs, int master)
int saved_console_loglevel = console_loglevel;
pr_alert("UV: tracing %s for %d CPUs from CPU %d\n",
- uv_nmi_action_is("ips") ? "IPs" : "processes",
+ uv_nmi_action == nmi_act_ips ? "IPs" : "processes",
atomic_read(&uv_nmi_cpus_in_nmi), cpu);
console_loglevel = uv_nmi_loglevel;
@@ -874,7 +877,7 @@ static inline int uv_nmi_kdb_reason(void)
static inline int uv_nmi_kdb_reason(void)
{
/* Ensure user is expecting to attach gdb remote */
- if (uv_nmi_action_is("kgdb"))
+ if (uv_nmi_action == nmi_act_kgdb)
return 0;
pr_err("UV: NMI error: KDB is not enabled in this kernel\n");
@@ -950,28 +953,35 @@ static int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
master = (atomic_read(&uv_nmi_cpu) == cpu);
/* If NMI action is "kdump", then attempt to do it */
- if (uv_nmi_action_is("kdump")) {
+ if (uv_nmi_action == nmi_act_kdump) {
uv_nmi_kdump(cpu, master, regs);
/* Unexpected return, revert action to "dump" */
if (master)
- strscpy(uv_nmi_action, "dump", sizeof(uv_nmi_action));
+ uv_nmi_action = nmi_act_dump;
}
/* Pause as all CPU's enter the NMI handler */
uv_nmi_wait(master);
/* Process actions other than "kdump": */
- if (uv_nmi_action_is("health")) {
+ switch (uv_nmi_action) {
+ case nmi_act_health:
uv_nmi_action_health(cpu, regs, master);
- } else if (uv_nmi_action_is("ips") || uv_nmi_action_is("dump")) {
+ break;
+ case nmi_act_ips:
+ case nmi_act_dump:
uv_nmi_dump_state(cpu, regs, master);
- } else if (uv_nmi_action_is("kdb") || uv_nmi_action_is("kgdb")) {
+ break;
+ case nmi_act_kdb:
+ case nmi_act_kgdb:
uv_call_kgdb_kdb(cpu, regs, master);
- } else {
+ break;
+ default:
if (master)
- pr_alert("UV: unknown NMI action: %s\n", uv_nmi_action);
+ pr_alert("UV: unknown NMI action: %d\n", uv_nmi_action);
uv_nmi_sync_exit(master);
+ break;
}
/* Clear per_cpu "in_nmi" flag */
diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c
index 54663f3e00cb..ff5afc8a5a41 100644
--- a/arch/x86/platform/uv/uv_time.c
+++ b/arch/x86/platform/uv/uv_time.c
@@ -53,7 +53,7 @@ struct uv_rtc_timer_head {
struct {
int lcpu; /* systemwide logical cpu number */
u64 expires; /* next timer expiration for this cpu */
- } cpu[];
+ } cpu[] __counted_by(ncpus);
};
/*
generated by cgit v1.2.3 (git 2.46.0) at 2025-09-07 14:59:44 +0000