From 035f8aaabf2c31cd6206bff6da23a12fee69d1b7 Mon Sep 17 00:00:00 2001 From: Julia Suvorova Date: Tue, 16 Jun 2020 12:25:36 -0400 Subject: [PATCH 1/3] hw/pci/pcie: Move hot plug capability check to pre_plug callback RH-Author: Julia Suvorova Message-id: <20200616122536.1027685-1-jusual@redhat.com> Patchwork-id: 97548 O-Subject: [RHEL-AV-8.2.1 qemu-kvm PATCH 1/1] hw/pci/pcie: Move hot plug capability check to pre_plug callback Bugzilla: 1820531 RH-Acked-by: Danilo de Paula RH-Acked-by: Auger Eric RH-Acked-by: Sergio Lopez Pascual BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1820531 BRANCH: rhel-av-8.2.1 UPSTREAM: merged BREW: 29422092 Check for hot plug capability earlier to avoid removing devices attached during the initialization process. Run qemu with an unattached drive: -drive file=$FILE,if=none,id=drive0 \ -device pcie-root-port,id=rp0,slot=3,bus=pcie.0,hotplug=off Hotplug a block device: device_add virtio-blk-pci,id=blk0,drive=drive0,bus=rp0 If hotplug fails on plug_cb, drive0 will be deleted. Fixes: 0501e1aa1d32a6 ("hw/pci/pcie: Forbid hot-plug if it's disabled on the slot") Acked-by: Igor Mammedov Signed-off-by: Julia Suvorova Message-Id: <20200604125947.881210-1-jusual@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin (cherry picked from commit 0dabc0f6544f2c0310546f6d6cf3b68979580a9c) Signed-off-by: Eduardo Lima (Etrunko) --- hw/pci/pcie.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c index abc99b6eff..1386dd228c 100644 --- a/hw/pci/pcie.c +++ b/hw/pci/pcie.c @@ -407,6 +407,17 @@ static void pcie_cap_slot_plug_common(PCIDevice *hotplug_dev, DeviceState *dev, void pcie_cap_slot_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp) { + PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev); + uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap; + uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP); + + /* Check if hot-plug is disabled on the slot */ + if (dev->hotplugged && (sltcap & PCI_EXP_SLTCAP_HPC) == 0) { + error_setg(errp, "Hot-plug failed: unsupported by the port device '%s'", + DEVICE(hotplug_pdev)->id); + return; + } + pcie_cap_slot_plug_common(PCI_DEVICE(hotplug_dev), dev, errp); } @@ -415,7 +426,6 @@ void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, { PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev); uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap; - uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP); PCIDevice *pci_dev = PCI_DEVICE(dev); /* Don't send event when device is enabled during qemu machine creation: @@ -431,13 +441,6 @@ void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, return; } - /* Check if hot-plug is disabled on the slot */ - if ((sltcap & PCI_EXP_SLTCAP_HPC) == 0) { - error_setg(errp, "Hot-plug failed: unsupported by the port device '%s'", - DEVICE(hotplug_pdev)->id); - return; - } - /* To enable multifunction hot-plug, we just ensure the function * 0 added last. When function 0 is added, we set the sltsta and * inform OS via event notification. -- 2.27.0