On Tue, Oct 20, 2026 at 10:37:34AM -0700, Pavel Popov wrote: > VMware and Hyper-V expose passthrough devices to guest VMs without an > explicit host bridge device. Consequently, host_bridge_whitelist() > cannot automatically identify the underlying host bridge structure, > causing Peer-to-Peer DMA (P2PDMA) requests to be rejected unless the > device IDs are explicitly listed in pci_p2pdma_whitelist[]. To enable > P2PDMA on Intel hosts, this series extends cpu_supports_p2pdma(), which > so far covers AMD Zen and newer, with an explicit list of Intel Xeon > server generations. > > Patch 1 moves the CONFIG_X86 #ifdef out of cpu_supports_p2pdma(). > Patch 2 is the v3 patch rebased on it, with Logan's Reviewed-by carried > over; the Xeon list and the check are unchanged. > > Changes in v4: > - Add 1/2, moving the CONFIG_X86 #ifdef out of cpu_supports_p2pdma() > (Logan Gunthorpe, Leon Romanovsky) > - Keep the #ifdef around the asm/ includes, as these headers exist > only on x86 (Bjorn Helgaas)
I'm confident that this is wrong usage of asm headers. Thanks
