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pcie_root_port: Add hotplug disabling option

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Make hot-plug/hot-unplug on PCIe Root Ports optional to allow libvirt
manage it and restrict unplug for the whole machine. This is going to
prevent user-initiated unplug in guests (Windows mostly).
Hotplug is enabled by default.
Usage:
    -device pcie-root-port,hotplug=off,...

If you want to disable hot-unplug on some downstream ports of one
switch, disable hot-unplug on PCIe Root Port connected to the upstream
port as well as on the selected downstream ports.

Discussion related:
    https://lists.gnu.org/archive/html/qemu-devel/2020-02/msg00530.html

Signed-off-by: Julia Suvorova <jusual@redhat.com>
Message-Id: <20200226174607.205941-1-jusual@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Julia Suvorova 2020-02-26 18:46:07 +01:00 • committed by Michael S. Tsirkin
parent 67f17e23ba
commit 530a096318
6 changed files with 14 additions and 7 deletions
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2
include/hw/pci/pcie.h
View file

@ -104,7 +104,7 @@ void pcie_cap_deverr_reset(PCIDevice *dev);
void pcie_cap_lnkctl_init(PCIDevice *dev);
void pcie_cap_lnkctl_reset(PCIDevice *dev);
void pcie_cap_slot_init(PCIDevice *dev, uint16_t slot);
void pcie_cap_slot_init(PCIDevice *dev, PCIESlot *s);
void pcie_cap_slot_reset(PCIDevice *dev);
void pcie_cap_slot_get(PCIDevice *dev, uint16_t *slt_ctl, uint16_t *slt_sta);
void pcie_cap_slot_write_config(PCIDevice *dev,