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| author | Bernhard Beschow <shentey@gmail.com> | 2022-05-13 20:09:56 +0200 |
|---|---|---|
| committer | Anthony PERARD <anthony.perard@citrix.com> | 2022-06-09 14:47:42 +0100 |
| commit | 36902417460e3f9f1c63a79d802622fd774f1c30 (patch) | |
| tree | 2349f253b9b294a4549e47792fb9859a8640a0b3 /hw | |
| parent | 7851b21a8192750adecbcf6e8780a20de5891ad6 (diff) | |
| download | qemu-36902417460e3f9f1c63a79d802622fd774f1c30.zip qemu-36902417460e3f9f1c63a79d802622fd774f1c30.tar.gz qemu-36902417460e3f9f1c63a79d802622fd774f1c30.tar.bz2 | |
hw/ide/piix: Add some documentation to pci_piix3_xen_ide_unplug()
The comment is based on commit message
ae4d2eb273b167dad748ea4249720319240b1ac2 'xen-platform: add missing disk
unplug option'. Since it seems to describe design decisions and
limitations that still apply it seems worth having.
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>
Message-Id: <20220513180957.90514-3-shentey@gmail.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/ide/piix.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/hw/ide/piix.c b/hw/ide/piix.c index 2345fe9..bc1b375 100644 --- a/hw/ide/piix.c +++ b/hw/ide/piix.c @@ -173,6 +173,17 @@ static void pci_piix_ide_realize(PCIDevice *dev, Error **errp) } } +/* + * 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 + */ int pci_piix3_xen_ide_unplug(DeviceState *dev, bool aux) { PCIIDEState *pci_ide; |