Sheng Yang wrote:
Seems we needn't tell userspace if MSI can be enabled. It's determined mostly by the device, and pci_enable_msi() checked that. So I think QEmu can expose MSI capability if the device got it. If it's fail to be enabled, just fall back to IRQ and return error to QEmu is enough, of course, QEmu should set MSI enable bit after kernel space done.
Do we need to add the additional condition, "and if the host kernel supports it"?
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