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Re: [Xen-devel] [PATCH] x86/shutdown: Use ACPI reboot method for Dell PowerEdge R740

On 01/22/2018 12:29 PM, Jan Beulich wrote:
On 19.01.18 at 17:57, <ross.lagerwall@xxxxxxxxxx> wrote:
--- a/xen/arch/x86/shutdown.c
+++ b/xen/arch/x86/shutdown.c
@@ -511,6 +511,15 @@ static struct dmi_system_id __initdata reboot_dmi_table[] 
= {
              DMI_MATCH(DMI_PRODUCT_NAME, "Latitude E6520"),
+    {    /* Handle problems with rebooting on Dell PowerEdge R740. */
+        .callback = override_reboot,
+        .driver_data = (void *)(long)BOOT_ACPI,
+        .ident = "Dell PowerEdge R740",
+        .matches = {
+            DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+            DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R740"),
+        },
+    },

Judging from the description you don't really want or need to
override the reboot method if not running under EFI, or if there
was an override on the command line already. override_reboot(),
however, overrides everything and under all circumstances. I
therefore think you may want to introduce a new callback

Agreed, it should only apply when running under EFI. Note that the command-line takes priority over override_reboot() -- see the note at the start of reboot_init().

As an aside - how come the page at address zero is actually
mapped at the time of the reboot attempt?

No idea...

Ross Lagerwall

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