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[Qemu-devel] [PATCH] pc: fail memory hot-plug/unplug with -no-acpi and Q


From: Haozhong Zhang
Subject: [Qemu-devel] [PATCH] pc: fail memory hot-plug/unplug with -no-acpi and Q35 machine type
Date: Fri, 22 Dec 2017 09:51:20 +0800

When -no-acpi option is used with Q35 machine type, no guest ACPI is
built, but the ACPI device is still created, so only checking the
presence of ACPI device before memory plug/unplug is not enough in
such cases. Check whether ACPI is disabled globally in addition and
fail memory plug/unplug if it's disabled.

Signed-off-by: Haozhong Zhang <address@hidden>
---
 hw/i386/pc.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 3fcf318a95..55686bf5d8 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1695,9 +1695,14 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
         align = memory_region_get_alignment(mr);
     }
 
-    if (!pcms->acpi_dev) {
+    /*
+     * When -no-acpi is used with Q35 machine type, no ACPI is built,
+     * but pcms->acpi_dev is still created. Check !acpi_enabled in
+     * addition to cover this case.
+     */
+    if (!pcms->acpi_dev || !acpi_enabled) {
         error_setg(&local_err,
-                   "memory hotplug is not enabled: missing acpi device");
+                   "memory hotplug is not enabled: missing acpi device or acpi 
disabled");
         goto out;
     }
 
@@ -1729,9 +1734,14 @@ static void pc_dimm_unplug_request(HotplugHandler 
*hotplug_dev,
     Error *local_err = NULL;
     PCMachineState *pcms = PC_MACHINE(hotplug_dev);
 
-    if (!pcms->acpi_dev) {
+    /*
+     * When -no-acpi is used with Q35 machine type, no ACPI is built,
+     * but pcms->acpi_dev is still created. Check !acpi_enabled in
+     * addition to cover this case.
+     */
+    if (!pcms->acpi_dev || !acpi_enabled) {
         error_setg(&local_err,
-                   "memory hotplug is not enabled: missing acpi device");
+                   "memory hotplug is not enabled: missing acpi device or acpi 
disabled");
         goto out;
     }
 
-- 
2.14.1




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