On Fri, Apr 21, 2023 at 11:54:17AM +0200, Lorenzo Pieralisi wrote: > On Thu, Apr 20, 2023 at 06:30:25PM -0700, Dexuan Cui wrote: > > 4 commits are involved here: > > A (2016): commit 0de8ce3ee8e3 ("PCI: hv: Allocate physically contiguous hypercall params buffer") > > B (2017): commit be66b6736591 ("PCI: hv: Use page allocation for hbus structure") > > C (2019): commit 877b911a5ba0 ("PCI: hv: Avoid a kmemleak false positive caused by the hbus buffer") > > D (2018): commit 68bb7bfb7985 ("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@xxxxxxxxxxxxx> > > Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx> > > --- > > > > Changes in v2: > > Fixed the inaccuracy in the commit message (Thanks Michael): > > "Confidential VMs (CVMs)" -> "Confidential VMs (CVMs) running without a paravisor". > > > > Added Michael's Reviewed-by. > > > > drivers/pci/controller/pci-hyperv.c | 48 +++++------------------------ > > 1 file changed, 7 insertions(+), 41 deletions(-) > > Acked-by: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx> > Applied to hyperv-next. Thanks.