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x86/jailhouse: Avoid access of unsupported platform resources

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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
This commit is contained in:
Jan Kiszka 2017-11-27 09:11:50 +01:00 committed by Thomas Gleixner
parent e85eb632f6
commit 0d7c1e2218
1 changed files with 13 additions and 0 deletions
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13
arch/x86/kernel/jailhouse.c
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@ -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));