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d="scan'208";a="73081441" To: CC: Bernhard Beschow , Anthony PERARD , John Snow , Subject: [PULL 2/3] hw/ide/piix: Add some documentation to pci_piix3_xen_ide_unplug() Date: Thu, 9 Jun 2022 15:02:01 +0100 Message-ID: <20220609140202.45227-3-anthony.perard@citrix.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220609140202.45227-1-anthony.perard@citrix.com> References: <20220609140202.45227-1-anthony.perard@citrix.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=216.71.155.175; envelope-from=prvs=1525abdf4=anthony.perard@citrix.com; helo=esa6.hc3370-68.iphmx.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Reply-to: Anthony PERARD From: Anthony PERARD via X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1654787856838100001 Content-Type: text/plain; charset="utf-8" From: Bernhard Beschow 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 Reviewed-by: Anthony PERARD Message-Id: <20220513180957.90514-3-shentey@gmail.com> Signed-off-by: Anthony PERARD --- hw/ide/piix.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/hw/ide/piix.c b/hw/ide/piix.c index 2345fe9e1d..bc1b37512a 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) } } =20 +/* + * 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' di= sks + * is simultaneously requested is not clear. The implementation assu= mes + * that an 'all' request overrides an 'aux' request. + * + * [1] https://xenbits.xen.org/gitweb/?p=3Dxen.git;a=3Dblob;f=3Ddocs/misc/= hvm-emulated-unplug.pandoc + */ int pci_piix3_xen_ide_unplug(DeviceState *dev, bool aux) { PCIIDEState *pci_ide; --=20 Anthony PERARD