linux-kernel - [PATCH v2 10/12] x86/jailhouse: Halt instead of failing to restart

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Date:   Mon, 27 Nov 2017 09:11:52 +0100
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jailhouse-dev@...glegroups.com
Subject: [PATCH v2 10/12] x86/jailhouse: Halt instead of failing to restart

From: Jan Kiszka <jan.kiszka@...mens.com>

Jailhouse provides no guest-initiated restart. So, do not even try to.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 arch/x86/kernel/jailhouse.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index 36feb0e4b4fe..c8ee638b6bce 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -12,10 +12,12 @@
 
 #include <linux/acpi_pmtmr.h>
 #include <linux/kernel.h>
+#include <linux/reboot.h>
 #include <asm/apic.h>
 #include <asm/cpu.h>
 #include <asm/hypervisor.h>
 #include <asm/i8259.h>
+#include <asm/reboot.h>
 #include <asm/setup.h>
 
 static __initdata struct jailhouse_setup_data setup_data;
@@ -79,6 +81,12 @@ static void __init jailhouse_get_smp_config(unsigned int early)
 	smp_found_config = 1;
 }
 
+static void jailhouse_no_restart(void)
+{
+	pr_notice("Jailhouse: Restart not supported, halting\n");
+	machine_halt();
+}
+
 static void __init jailhouse_init_platform(void)
 {
 	u64 pa_data = boot_params.hdr.setup_data;
@@ -98,6 +106,8 @@ static void __init jailhouse_init_platform(void)
 
 	legacy_pic			= &null_legacy_pic;
 
+	machine_ops.emergency_restart	= jailhouse_no_restart;
+
 	while (pa_data) {
 		mapping = early_memremap(pa_data, sizeof(header));
 		memcpy(&header, mapping, sizeof(header));
-- 
2.12.3