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Commit 50624dd1 authored by Borislav Petkov's avatar Borislav Petkov Committed by Greg Kroah-Hartman
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x86/kaiser: Rename and simplify X86_FEATURE_KAISER handling




Concentrate it in arch/x86/mm/kaiser.c and use the upstream string "nopti".

Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 23e09439
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+1 −1
Original line number Diff line number Diff line
@@ -2763,7 +2763,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.

	nojitter	[IA-64] Disables jitter checking for ITC timers.

	nokaiser	[X86-64] Disable KAISER isolation of kernel from user.
	nopti		[X86-64] Disable KAISER isolation of kernel from user.

	no-kvmclock	[X86,KVM] Disable paravirtualized KVM clock driver

+0 −18
Original line number Diff line number Diff line
@@ -179,20 +179,6 @@ static int __init x86_pcid_setup(char *s)
	return 1;
}
__setup("nopcid", x86_pcid_setup);

static int __init x86_nokaiser_setup(char *s)
{
	/* nokaiser doesn't accept parameters */
	if (s)
		return -EINVAL;
#ifdef CONFIG_KAISER
	kaiser_enabled = 0;
	setup_clear_cpu_cap(X86_FEATURE_KAISER);
	pr_info("nokaiser: KAISER feature disabled\n");
#endif
	return 0;
}
early_param("nokaiser", x86_nokaiser_setup);
#endif

static int __init x86_noinvpcid_setup(char *s)
@@ -813,10 +799,6 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
		c->x86_capability[CPUID_8000_000A_EDX] = cpuid_edx(0x8000000a);

	init_scattered_cpuid_features(c);
#ifdef CONFIG_KAISER
	if (kaiser_enabled)
		set_cpu_cap(c, X86_FEATURE_KAISER);
#endif
}

static void identify_cpu_without_cpuid(struct cpuinfo_x86 *c)
+19 −1
Original line number Diff line number Diff line
@@ -274,8 +274,13 @@ void __init kaiser_init(void)
{
	int cpu;

	if (!kaiser_enabled)
	if (!kaiser_enabled) {
		setup_clear_cpu_cap(X86_FEATURE_KAISER);
		return;
	}

	setup_force_cpu_cap(X86_FEATURE_KAISER);

	kaiser_init_all_pgds();

	for_each_possible_cpu(cpu) {
@@ -418,3 +423,16 @@ void kaiser_flush_tlb_on_return_to_user(void)
			X86_CR3_PCID_USER_FLUSH | KAISER_SHADOW_PGD_OFFSET);
}
EXPORT_SYMBOL(kaiser_flush_tlb_on_return_to_user);

static int __init x86_nokaiser_setup(char *s)
{
	/* nopti doesn't accept parameters */
	if (s)
		return -EINVAL;

	kaiser_enabled = 0;
	pr_info("Kernel/User page tables isolation: disabled\n");

	return 0;
}
early_param("nopti", x86_nokaiser_setup);