From 2841ab435bca9f102311e01bf157d5fa878935dc Mon Sep 17 00:00:00 2001 From: Michael S. Tsirkin Date: Fri, 21 Jun 2019 00:12:22 -0400 Subject: pcie: check that slt ctrl changed before deleting During boot, linux would sometimes overwrites control of a powered off slot before powering it on. Unfortunately QEMU interprets that as a power off request and ejects the device. For example: /x86_64-softmmu/qemu-system-x86_64 -enable-kvm -S -machine q35 \ -device pcie-root-port,id=pcie_root_port_0,slot=2,chassis=2,addr=0x2,bus=pcie.0 \ -monitor stdio disk.qcow2 (qemu)device_add virtio-balloon-pci,id=balloon,bus=pcie_root_port_0 (qemu)cont Balloon is deleted during guest boot. To fix, save control beforehand and check that power or led state actually change before ejecting. Note: this is more a hack than a solution, ideally we'd find a better way to detect ejects, or move away from ejects completely and instead monitor whether it's safe to delete device due to e.g. its power state. Signed-off-by: Michael S. Tsirkin Reviewed-by: Marcel Apfelbaum Reviewed-by: Igor Mammedov Tested-by: Igor Mammedov --- include/hw/pci/pcie.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/hw/pci/pcie.h b/include/hw/pci/pcie.h index e30334d74d..8d90c0e193 100644 --- a/include/hw/pci/pcie.h +++ b/include/hw/pci/pcie.h @@ -107,7 +107,8 @@ void pcie_cap_lnkctl_reset(PCIDevice *dev); void pcie_cap_slot_init(PCIDevice *dev, uint16_t slot); void pcie_cap_slot_reset(PCIDevice *dev); -void pcie_cap_slot_write_config(PCIDevice *dev, +void pcie_cap_slot_get(PCIDevice *dev, uint16_t *slot_ctl, uint16_t *slt_sta); +void pcie_cap_slot_write_config(PCIDevice *dev, uint16_t slot_ctl, uint16_t slt_sta, uint32_t addr, uint32_t val, int len); int pcie_cap_slot_post_load(void *opaque, int version_id); void pcie_cap_slot_push_attention_button(PCIDevice *dev); -- cgit v1.2.3-55-g7522