x86/jailhouse: Avoid access of unsupported platform resources (0d7c1e22) · Commits · 戴 / test

Non-root cells do not have CMOS access, thus the warm reset cannot be enabled. There is no RTC, thus also no wall clock. Furthermore, there are no ISA IRQs and no PIC. Also disable probing of i8042 devices that are typically blocked for non-root cells. In theory, access could also be granted to a non-root cell, provided the root cell is not using the devices. But there is no concrete scenario in sight, and disabling probing over Jailhouse allows to build generic kernels that keep CONFIG_SERIO enabled for use in normal systems. Signed-off-by:

Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:

Thomas Gleixner <tglx@linutronix.de> Cc: jailhouse-dev@googlegroups.com Link: https://lkml.kernel.org/r/39b68cc2c496501c9d95e6f40e5d76e3053c3908.1511770314.git.jan.kiszka@siemens.com

arch/x86/kernel/jailhouse.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@
		#include <asm/apic.h>
		#include <asm/cpu.h>
		#include <asm/hypervisor.h>
		#include <asm/i8259.h>
		#include <asm/setup.h>

		static __initdata struct jailhouse_setup_data setup_data;
		@@ -32,6 +33,11 @@ static uint32_t __init jailhouse_detect(void)
		return jailhouse_cpuid_base();
		}

		static void jailhouse_get_wallclock(struct timespec *now)
		{
		memset(now, 0, sizeof(*now));
		}

		static void __init jailhouse_timer_init(void)
		{
		lapic_timer_frequency = setup_data.apic_khz * (1000 / HZ);
		@@ -77,11 +83,18 @@ static void __init jailhouse_init_platform(void)
		struct setup_data header;
		void *mapping;

		x86_init.irqs.pre_vector_init = x86_init_noop;
		x86_init.timers.timer_init = jailhouse_timer_init;
		x86_init.mpparse.get_smp_config = jailhouse_get_smp_config;

		x86_platform.calibrate_cpu = jailhouse_get_tsc;
		x86_platform.calibrate_tsc = jailhouse_get_tsc;
		x86_platform.get_wallclock = jailhouse_get_wallclock;
		x86_platform.legacy.rtc = 0;
		x86_platform.legacy.warm_reset = 0;
		x86_platform.legacy.i8042 = X86_LEGACY_I8042_PLATFORM_ABSENT;

		legacy_pic = &null_legacy_pic;

		while (pa_data) {
		mapping = early_memremap(pa_data, sizeof(header));

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