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x86/platform: Control warm reset setup via legacy feature flag

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Allow to turn off the setup of BIOS-managed warm reset via a new flag in
x86_legacy_features. Besides the UV1, the upcoming jailhose guest support
needs this switched off.

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/44376558129d70a2c1527959811371ef4b82e829.1511770314.git.jan.kiszka@siemens.com
This commit is contained in:
Jan Kiszka 2017-11-27 09:11:44 +01:00 • committed by Thomas Gleixner
parent 32c9c801a8
commit e348caef8b
4 changed files with 5 additions and 2 deletions
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1
arch/x86/include/asm/x86_init.h
View file

@ -212,6 +212,7 @@ enum x86_legacy_i8042_state {
struct x86_legacy_features { struct x86_legacy_features {
enum x86_legacy_i8042_state i8042; enum x86_legacy_i8042_state i8042;
int rtc; int rtc;
int warm_reset;
int no_vga; int no_vga;
int reserve_bios_regions; int reserve_bios_regions;
struct x86_legacy_devices devices; struct x86_legacy_devices devices;

1
arch/x86/kernel/apic/x2apic_uv_x.c
View file

@ -316,6 +316,7 @@ static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
} else if (!strcmp(oem_table_id, "UVH")) { } else if (!strcmp(oem_table_id, "UVH")) {
/* Only UV1 systems: */ /* Only UV1 systems: */
uv_system_type = UV_NON_UNIQUE_APIC; uv_system_type = UV_NON_UNIQUE_APIC;
x86_platform.legacy.warm_reset = 0;
__this_cpu_write(x2apic_extra_bits, pnodeid << uvh_apicid.s.pnode_shift); __this_cpu_write(x2apic_extra_bits, pnodeid << uvh_apicid.s.pnode_shift);
uv_set_apicid_hibit(); uv_set_apicid_hibit();
uv_apic = 1; uv_apic = 1;

1
arch/x86/kernel/platform-quirks.c
View file

@ -9,6 +9,7 @@ void __init x86_early_init_platform_quirks(void)
{ {
x86_platform.legacy.i8042 = X86_LEGACY_I8042_EXPECTED_PRESENT; x86_platform.legacy.i8042 = X86_LEGACY_I8042_EXPECTED_PRESENT;
x86_platform.legacy.rtc = 1; x86_platform.legacy.rtc = 1;
x86_platform.legacy.warm_reset = 1;
x86_platform.legacy.reserve_bios_regions = 0; x86_platform.legacy.reserve_bios_regions = 0;
x86_platform.legacy.devices.pnpbios = 1; x86_platform.legacy.devices.pnpbios = 1;

4
arch/x86/kernel/smpboot.c
View file

@ -934,7 +934,7 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle,
* the targeted processor. * the targeted processor.
*/ */
if (get_uv_system_type() != UV_NON_UNIQUE_APIC) { if (x86_platform.legacy.warm_reset) {
pr_debug("Setting warm reset code and vector.\n"); pr_debug("Setting warm reset code and vector.\n");
@ -1006,7 +1006,7 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle,
/* mark "stuck" area as not stuck */ /* mark "stuck" area as not stuck */
*trampoline_status = 0; *trampoline_status = 0;
if (get_uv_system_type() != UV_NON_UNIQUE_APIC) { if (x86_platform.legacy.warm_reset) {
/* /*
* Cleanup possible dangling ends... * Cleanup possible dangling ends...
*/ */