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From fe8a9f211fba3588d60507b3d2f48c41d8ee3c79 Mon Sep 17 00:00:00 2001
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From: Julia Suvorova <jusual@redhat.com>
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Date: Mon, 4 May 2020 21:25:04 +0100
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Subject: [PATCH 1/9] hw/pci/pcie: Forbid hot-plug if it's disabled on the slot
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RH-Author: Julia Suvorova <jusual@redhat.com>
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Message-id: <20200504212505.15977-2-jusual@redhat.com>
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Patchwork-id: 96257
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O-Subject: [RHEL-AV-8.2.1 qemu-kvm PATCH 1/2] hw/pci/pcie: Forbid hot-plug if it's disabled on the slot
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Bugzilla: 1820531
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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Raise an error when trying to hot-plug/unplug a device through QMP to a device
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with disabled hot-plug capability. This makes the device behaviour more
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consistent and provides an explanation of the failure in the case of
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asynchronous unplug.
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Signed-off-by: Julia Suvorova <jusual@redhat.com>
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Message-Id: <20200427182440.92433-2-jusual@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
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(cherry picked from commit 0501e1aa1d32a6e02dd06a79bba97fbe9d557cb5)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/pci/pcie.c | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
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index 0eb3a2a..6b48d04 100644
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--- a/hw/pci/pcie.c
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+++ b/hw/pci/pcie.c
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@@ -415,6 +415,7 @@ void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
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{
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PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev);
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uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap;
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+ uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP);
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PCIDevice *pci_dev = PCI_DEVICE(dev);
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/* Don't send event when device is enabled during qemu machine creation:
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@@ -430,6 +431,13 @@ void pcie_cap_slot_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,
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return;
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}
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+ /* Check if hot-plug is disabled on the slot */
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+ if ((sltcap & PCI_EXP_SLTCAP_HPC) == 0) {
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+ error_setg(errp, "Hot-plug failed: unsupported by the port device '%s'",
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+ DEVICE(hotplug_pdev)->id);
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+ return;
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+ }
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+
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/* To enable multifunction hot-plug, we just ensure the function
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* 0 added last. When function 0 is added, we set the sltsta and
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* inform OS via event notification.
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@@ -470,6 +478,17 @@ void pcie_cap_slot_unplug_request_cb(HotplugHandler *hotplug_dev,
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Error *local_err = NULL;
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PCIDevice *pci_dev = PCI_DEVICE(dev);
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PCIBus *bus = pci_get_bus(pci_dev);
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+ PCIDevice *hotplug_pdev = PCI_DEVICE(hotplug_dev);
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+ uint8_t *exp_cap = hotplug_pdev->config + hotplug_pdev->exp.exp_cap;
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+ uint32_t sltcap = pci_get_word(exp_cap + PCI_EXP_SLTCAP);
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+
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+ /* Check if hot-unplug is disabled on the slot */
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+ if ((sltcap & PCI_EXP_SLTCAP_HPC) == 0) {
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+ error_setg(errp, "Hot-unplug failed: "
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+ "unsupported by the port device '%s'",
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+ DEVICE(hotplug_pdev)->id);
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+ return;
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+ }
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pcie_cap_slot_plug_common(PCI_DEVICE(hotplug_dev), dev, &local_err);
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if (local_err) {
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--
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1.8.3.1
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