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1. disable physical MSI before writing the virtual MSI CFG space 2. do the remap_vmsi if the guest wants to enable MSI or update MSI address or data 3. disable INTx and enable MSI after step 2. The previous Message Control check depends on the guest write MSI Message Control Register at the offset of Message Control Register. However, the guest could access this register at the offset of MSI Capability ID register. This patch remove this constraint. Also, The previous implementation didn't really disable MSI when guest wanted to disable MSI. Tracked-On: #3475 Signed-off-by: Li Fei1 <fei1.li@intel.com>