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Tsirkin" , Ani Sinha , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH 10/40] pcihp: piix4: do not call acpi_pcihp_reset() when ACPI PCI hotplug is disabled Date: Thu, 12 Jan 2023 15:02:42 +0100 Message-Id: <20230112140312.3096331-11-imammedo@redhat.com> In-Reply-To: <20230112140312.3096331-1-imammedo@redhat.com> References: <20230112140312.3096331-1-imammedo@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 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+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=imammedo@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1673538667192100003 piix4_pm_reset() is calling acpi_pcihp_reset() when ACPI PCI hotplug is disabled, which leads to assigning BSEL properties to bridges on path acpi_set_bsel() ... if (qbus_is_hotpluggable(BUS(bus))) { // above happens to be true by default (though it's SHPC hotplug = handler) // set BSEL } At the moment the issue is masked by the fact that we use not only BSEL, to decide if we should generated hoplug AML but also pcihp_bridge_en knob. However the later patches will drop dependency on pcihp_bridge_en, and use only BSEL exclusively to decide if hotplug AML for slots should be = built, which exposes issue. We should not ever call acpi_pcihp_reset() if ACPI PCI hotplug is disabled, make it so. PS: * Q35 does the right thing (i.e. it calls acpi_pcihp_reset only when pcihp= is enabled) * the issue also makes acpi_pcihp_update() logic run on SHPC enabled bridg= es, which seems to be harmless Fixes: 3d7e78aa777 ("Introduce a new flag for i440fx to disable PCI hotplug= on the root bus") Signed-off-by: Igor Mammedov --- CC: "Philippe Mathieu-Daud=C3=A9" --- hw/acpi/piix4.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c index 0a81f1ad93..f256761e55 100644 --- a/hw/acpi/piix4.c +++ b/hw/acpi/piix4.c @@ -305,7 +305,9 @@ static void piix4_pm_reset(DeviceState *dev) acpi_update_sci(&s->ar, s->irq); =20 pm_io_space_update(s); - acpi_pcihp_reset(&s->acpi_pci_hotplug, !s->use_acpi_root_pci_hotplug); + if (s->use_acpi_hotplug_bridge || s->use_acpi_root_pci_hotplug) { + acpi_pcihp_reset(&s->acpi_pci_hotplug, !s->use_acpi_root_pci_hotpl= ug); + } } =20 static void piix4_pm_powerdown_req(Notifier *n, void *opaque) --=20 2.31.1