[Qemu-devel] [PATCH] Allow more IDE power management

[Ben Guthro <bguthro@virtualiron.com>]

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Made the QEMU IDE disk tolerate more power-mgmt commands, specifically:
   WIN_SETFEATURE(EN_AAM)    - enable automatic acoustic mgmt
   WIN_SETFEATURE(DIS_AAM)    - disable automatic acoustic mgmt
   WIN_STANDBY
   WIN_SETIDLE1
   WIN_SLEEPNOW1
   WIN_STANDBY2
   WIN_SETIDLE2
   WIN_SLEEPNOW2
   WIN_STANDBYNOW2
These are all essentially no-ops, like existing support for EN_RLA (enable
read lookahead) and WIN_STANDBYNOW1.

This fixes a crash in the SLES9-SP3 64bit kernel when the powersaved was
started (with ACPI or ACM).  This guest really only needs EN_AAM, DIS_APM,
and WIN_SETIDLE1 support, but the others seemed sensible to include.

I've excluded EN_APM since I'm unsure of what that's agreeing to do.  It's
probably ok to include.

Signed-off-by: Ben Guthro <bguthro@virtualiron.com>
Signed-off-by: David Lively <dlively@virtualiron.com>


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diff -r 106bc46793ca hw/ide.c
--- a/hw/ide.c	Mon Aug 27 16:20:33 2007 -0400
+++ b/hw/ide.c	Mon Aug 27 16:27:28 2007 -0400
@@ -1914,6 +1914,8 @@ static void ide_ioport_write(void *opaqu
             case 0x67: /* NOP */
             case 0x96: /* NOP */
             case 0x9a: /* NOP */
+	    case 0x42: /* enable Automatic Acoustic Mode */
+	    case 0xc2: /* disable Automatic Acoustic Mode */
                 s->status = READY_STAT | SEEK_STAT;
                 ide_set_irq(s);
                 break;
@@ -1952,12 +1954,16 @@ static void ide_ioport_write(void *opaqu
 	    s->status = READY_STAT;
             ide_set_irq(s);
             break;
+        case WIN_STANDBY:
+        case WIN_STANDBY2:
 	case WIN_STANDBYNOW1:
         case WIN_STANDBYNOW2:
         case WIN_IDLEIMMEDIATE:
         case CFA_IDLEIMMEDIATE:
         case WIN_SETIDLE1:
         case WIN_SETIDLE2:
+        case WIN_SLEEPNOW1:
+        case WIN_SLEEPNOW2:
 	    s->status = READY_STAT;
             ide_set_irq(s);
             break;