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4 commits are involved here: A (2016): commit0de8ce3ee8("PCI: hv: Allocate physically contiguous hypercall params buffer") B (2017): commitbe66b67365("PCI: hv: Use page allocation for hbus structure") C (2019): commit877b911a5b("PCI: hv: Avoid a kmemleak false positive caused by the hbus buffer") D (2018): commit68bb7bfb79("X86/Hyper-V: Enable IPI enlightenments") Patch D introduced the per-CPU hypercall input page "hyperv_pcpu_input_arg" in 2018. With patch D, we no longer need the per-Hyper-V-PCI-bus hypercall input page "hbus->retarget_msi_interrupt_params" that was added in patch A, and the issue addressed by patch B is no longer an issue, and we can also get rid of patch C. The change here is required for PCI device assignment to work for Confidential VMs (CVMs) running without a paravisor, because otherwise we would have to call set_memory_decrypted() for "hbus->retarget_msi_interrupt_params" before calling the hypercall HVCALL_RETARGET_INTERRUPT. Signed-off-by: Dexuan Cui <decui@microsoft.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Acked-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Link: https://lore.kernel.org/r/20230421013025.17152-1-decui@microsoft.com Signed-off-by: Wei Liu <wei.liu@kernel.org>