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From 4a31485efad9db7feed56f483e123f0b58c38b2f Mon Sep 17 00:00:00 2001
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From: Igor Mammedov <imammedo@redhat.com>
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Date: Mon, 29 Nov 2021 06:48:11 -0500
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Subject: pci: reserve resources for pcie-pci-bridge to fix regressed hotplug
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on q35
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RH-Bugzilla: 2001921
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If QEMU is started with unpopulated pcie-pci-bridge with ACPI PCI
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hotplug enabled (default since QEMU-6.1), hotplugging a PCI device
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into one of the bridge slots fails due to lack of resources.
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once linux guest is booted (test used Fedora 34), hotplug NIC from
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QEMU monitor:
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(qemu) device_add rtl8139,bus=pcie-pci-bridge-0,addr=0x2
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guest fails hotplug with:
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pci 0000:01:02.0: [10ec:8139] type 00 class 0x020000
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pci 0000:01:02.0: reg 0x10: [io 0x0000-0x00ff]
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pci 0000:01:02.0: reg 0x14: [mem 0x00000000-0x000000ff]
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pci 0000:01:02.0: reg 0x30: [mem 0x00000000-0x0003ffff pref]
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pci 0000:01:02.0: BAR 6: no space for [mem size 0x00040000 pref]
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pci 0000:01:02.0: BAR 6: failed to assign [mem size 0x00040000 pref]
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pci 0000:01:02.0: BAR 0: no space for [io size 0x0100]
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pci 0000:01:02.0: BAR 0: failed to assign [io size 0x0100]
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pci 0000:01:02.0: BAR 1: no space for [mem size 0x00000100]
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pci 0000:01:02.0: BAR 1: failed to assign [mem size 0x00000100]
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8139cp: 8139cp: 10/100 PCI Ethernet driver v1.3 (Mar 22, 2004)
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PCI Interrupt Link [GSIG] enabled at IRQ 22
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8139cp 0000:01:02.0: no MMIO resource
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8139cp: probe of 0000:01:02.0 failed with error -5
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Reason for this is that commit [1] didn't take into account
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pcie-pci-bridge, marking bridge as non hotpluggable instead of
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handling it as possibly SHPC capable bridge.
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Fix issue by checking if pcie-pci-bridge is SHPC capable and
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if it is mark it as hotpluggable.
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Fixes regression in QEMU-6.1 and later, since it was switched
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to ACPI based PCI hotplug on Q35 by default at that time.
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[1]
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Fixes: 3aa31d7d637 ("hw/pci: reserve IO and mem for pci express downstream ports with no devices attached")
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Signed-off-by: Igor Mammedov imammedo@redhat.com
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CC: mapfelba@redhat.com
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CC: kraxel@redhat.com
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CC: mst@redhat.com
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CC: lvivier@redhat.com
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CC: jusual@redhat.com
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Tested-by: Laurent Vivier <lvivier@redhat.com>
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Acked-by: Michael S. Tsirkin <mst@redhat.com>
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Message-Id: <20211129114812.231849-2-imammedo@redhat.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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---
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src/fw/pciinit.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/src/fw/pciinit.c b/src/fw/pciinit.c
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index 3c99d51..badf13d 100644
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--- a/src/fw/pciinit.c
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+++ b/src/fw/pciinit.c
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@@ -808,6 +808,10 @@ static hotplug_type_t pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
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pcie_cap + PCI_EXP_FLAGS);
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u8 port_type = ((pcie_flags & PCI_EXP_FLAGS_TYPE) >>
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(__builtin_ffs(PCI_EXP_FLAGS_TYPE) - 1));
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+
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+ if (port_type == PCI_EXP_TYPE_PCI_BRIDGE)
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+ goto check_shpc;
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+
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u8 downstream_port = (port_type == PCI_EXP_TYPE_DOWNSTREAM) ||
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(port_type == PCI_EXP_TYPE_ROOT_PORT);
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/*
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@@ -825,6 +829,7 @@ static hotplug_type_t pci_bus_hotplug_support(struct pci_bus *bus, u8 pcie_cap)
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HOTPLUG_PCIE : HOTPLUG_NO_SUPPORTED;
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}
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+check_shpc:
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shpc_cap = pci_find_capability(bus->bus_dev->bdf, PCI_CAP_ID_SHPC, 0);
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return !!shpc_cap ? HOTPLUG_SHPC : HOTPLUG_NO_SUPPORTED;
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}
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--
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2.27.0
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