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4adad73cfc
Now only PCI MSI-X BAR access need dynamic register/unregister. Others don't need unregister once it's registered. So we don't need to lock the vm level emul_mmio_lock when we handle the MMIO access. Instead, we could use finer granularity lock in the handler to ptotest the shared resource. This patch fixed the dead lock issue when OVMF try to size the BAR size: Becasue OVMF use ECAM to access the PCI configuration space, it will first hold vm emul_mmio_lock, then calls vpci_handle_mmconfig_access. While this tries to size a BAR which is also a MSI-X Table BAR, it will call register_mmio_emulation_handler to register the MSI-X Table BAR MMIO access handler. This will causes the emul_mmio_lock dead lock. Tracked-On: #3475 Signed-off-by: Li Fei1 <fei1.li@intel.com> |
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