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However, that method seems to be widely untested, and quite often leads to a result similar to: Hardware Dom0 shutdown: rebooting machine ----[ Xen-4.18-unstable x86_64 debug=3Dy Tainted: C ]---- CPU: 0 RIP: e008:[<0000000000000017>] 0000000000000017 RFLAGS: 0000000000010202 CONTEXT: hypervisor [...] Xen call trace: [<0000000000000017>] R 0000000000000017 [] S ffff83207eff7b50 [] F machine_restart+0x1da/0x261 [] F apic_wait_icr_idle+0/0x37 [] F smp_call_function_interrupt+0xc7/0xcb [] F call_function_interrupt+0x20/0x34 [] F do_IRQ+0x150/0x6f3 [] F common_interrupt+0x132/0x140 [] F arch/x86/acpi/cpu_idle.c#acpi_idle_do_entry+0x113= /0x129 [] F arch/x86/acpi/cpu_idle.c#acpi_processor_idle+0x3e= b/0x5f7 [] F arch/x86/domain.c#idle_loop+0xec/0xee **************************************** Panic on CPU 0: FATAL TRAP: vector =3D 6 (invalid opcode) **************************************** Which in most cases does lead to a reboot, however that's unreliable. Change the default reboot preference to prefer ACPI over UEFI if available = and not in reduced hardware mode. This is in line to what Linux does, so it's unlikely to cause issues on cur= rent and future hardware, since there's a much higher chance of vendors testing hardware with Linux rather than Xen. Add a special case for one Acer model that does require being rebooted using ResetSystem(). See Linux commit 0082517fa4bce for rationale. I'm not aware of using ACPI reboot causing issues on boxes that do have properly implemented ResetSystem() methods. Signed-off-by: Roger Pau Monn=C3=A9 --- Changes since v1: - Add special case for Acer model to use UEFI reboot. - Adjust commit message. --- xen/arch/x86/shutdown.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/xen/arch/x86/shutdown.c b/xen/arch/x86/shutdown.c index 7619544d14da..3816ede1afe5 100644 --- a/xen/arch/x86/shutdown.c +++ b/xen/arch/x86/shutdown.c @@ -150,19 +150,20 @@ static void default_reboot_type(void) =20 if ( xen_guest ) reboot_type =3D BOOT_XEN; + else if ( !acpi_disabled && !acpi_gbl_reduced_hardware ) + reboot_type =3D BOOT_ACPI; else if ( efi_enabled(EFI_RS) ) reboot_type =3D BOOT_EFI; - else if ( acpi_disabled ) - reboot_type =3D BOOT_KBD; else - reboot_type =3D BOOT_ACPI; + reboot_type =3D BOOT_KBD; } =20 static int __init cf_check override_reboot(const struct dmi_system_id *d) { enum reboot_type type =3D (long)d->driver_data; =20 - if ( type =3D=3D BOOT_ACPI && acpi_disabled ) + if ( (type =3D=3D BOOT_ACPI && acpi_disabled) || + (type =3D=3D BOOT_EFI && !efi_enabled(EFI_RS)) ) type =3D BOOT_KBD; =20 if ( reboot_type !=3D type ) @@ -172,6 +173,7 @@ static int __init cf_check override_reboot(const struct= dmi_system_id *d) [BOOT_KBD] =3D "keyboard controller", [BOOT_ACPI] =3D "ACPI", [BOOT_CF9] =3D "PCI", + [BOOT_EFI] =3D "UEFI", }; =20 reboot_type =3D type; @@ -530,6 +532,15 @@ static const struct dmi_system_id __initconstrel reboo= t_dmi_table[] =3D { DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R740"), }, }, + { /* Handle problems with rebooting on Acer TravelMate X514-51T. */ + .callback =3D override_reboot, + .driver_data =3D (void *)(long)BOOT_EFI, + .ident =3D "Acer TravelMate X514-51T", + .matches =3D { + DMI_MATCH(DMI_SYS_VENDOR, "Acer"), + DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate X514-51T"), + }, + }, { } }; =20 --=20 2.42.0