include/hw/ide: Unexport pci_piix3_xen_ide_unplug()

This function was declared in a generic and public header, implemented
in a device-specific source file but only used in xen_platform. Given its
'aux' parameter, this function is more xen-specific than piix-specific.
Also, the hardcoded magic constants seem to be generic and related to
PCIIDEState and IDEBus rather than piix.

Therefore, move this function to xen_platform, unexport it, and drop the
"piix3" in the function name as well.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220513180957.90514-4-shentey@gmail.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>

1 files changed, 47 insertions, 1 deletions

diff --git a/hw/i386/xen/xen_platform.c b/hw/i386/xen/xen_platform.c
index 72028449ba..a64265cca0 100644
--- a/hw/i386/xen/xen_platform.c
+++ b/hw/i386/xen/xen_platform.c
@@ -26,6 +26,7 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "hw/ide.h"
+#include "hw/ide/pci.h"
 #include "hw/pci/pci.h"
 #include "hw/xen/xen_common.h"
 #include "migration/vmstate.h"
@@ -134,6 +135,51 @@ static void pci_unplug_nics(PCIBus *bus)
     pci_for_each_device(bus, 0, unplug_nic, NULL);
 }
 
+/*
+ * The Xen HVM unplug protocol [1] specifies a mechanism to allow guests to
+ * request unplug of 'aux' disks (which is stated to mean all IDE disks,
+ * except the primary master).
+ *
+ * NOTE: The semantics of what happens if unplug of all disks and 'aux' disks
+ *       is simultaneously requested is not clear. The implementation assumes
+ *       that an 'all' request overrides an 'aux' request.
+ *
+ * [1] https://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=docs/misc/hvm-emulated-unplug.pandoc
+ */
+static void pci_xen_ide_unplug(DeviceState *dev, bool aux)
+{
+    PCIIDEState *pci_ide;
+    int i;
+    IDEDevice *idedev;
+    IDEBus *idebus;
+    BlockBackend *blk;
+
+    pci_ide = PCI_IDE(dev);
+
+    for (i = aux ? 1 : 0; i < 4; i++) {
+        idebus = &pci_ide->bus[i / 2];
+        blk = idebus->ifs[i % 2].blk;
+
+        if (blk && idebus->ifs[i % 2].drive_kind != IDE_CD) {
+            if (!(i % 2)) {
+                idedev = idebus->master;
+            } else {
+                idedev = idebus->slave;
+            }
+
+            blk_drain(blk);
+            blk_flush(blk);
+
+            blk_detach_dev(blk, DEVICE(idedev));
+            idebus->ifs[i % 2].blk = NULL;
+            idedev->conf.blk = NULL;
+            monitor_remove_blk(blk);
+            blk_unref(blk);
+        }
+    }
+    qdev_reset_all(dev);
+}
+
 static void unplug_disks(PCIBus *b, PCIDevice *d, void *opaque)
 {
     uint32_t flags = *(uint32_t *)opaque;
@@ -147,7 +193,7 @@ static void unplug_disks(PCIBus *b, PCIDevice *d, void *opaque)
 
     switch (pci_get_word(d->config + PCI_CLASS_DEVICE)) {
     case PCI_CLASS_STORAGE_IDE:
-        pci_piix3_xen_ide_unplug(DEVICE(d), aux);
+        pci_xen_ide_unplug(DEVICE(d), aux);
         break;
 
     case PCI_CLASS_STORAGE_SCSI: