Before the guest finishes probing a device, the host may be already starting to remove the device. Currently there are multiple race condition bugs in the pci-hyperv driver, which can cause the guest to panic. The patchset fixes the crashes. The patchset also does some cleanup work: patch 3 removes the useless hv_pcichild_state, and patch 4 reverts an old patch which is not really useful (without patch 4, it would be hard to make patch 5 clean). Patch 6 removes the use of a global mutex lock, and enables async-probing to allow concurrent device probing for faster boot. v3 is based on v6.3-rc5. No code change since v2. I just added Michael's and Long Li's Reviewed-by. The patchset is also availsble in my github branch: https://github.com/dcui/tdx/commits/decui/vpci/v6.3-rc5-v3 v2 can be found here: https://lwn.net/ml/linux-kernel/20230404020545.32359-1-decui@xxxxxxxxxxxxx/ Please review. Thanks! Dexuan Cui (6): PCI: hv: Fix a race condition bug in hv_pci_query_relations() PCI: hv: Fix a race condition in hv_irq_unmask() that can cause panic PCI: hv: Remove the useless hv_pcichild_state from struct hv_pci_dev Revert "PCI: hv: Fix a timing issue which causes kdump to fail occasionally" PCI: hv: Add a per-bus mutex state_lock PCI: hv: Use async probing to reduce boot time drivers/pci/controller/pci-hyperv.c | 145 +++++++++++++++++----------- 1 file changed, 86 insertions(+), 59 deletions(-) -- 2.25.1
