On Wed, Nov 11, 2026 at 03:48:07AM +0000, Popov, Pavel E wrote: > Hi Bjorn, > > Gentle ping on this series. Is this OK for v7.5?
I would say no. An Intel employee was asked to clean up an Intel-created mess while upstreaming an Intel-specific patch. Peer-to-peer is a general concept, and the code should reflect that. It is reasonable to expect you to join the effort and help clean it up. Thanks > > Thanks, > Pavel > > > -----Original Message----- > > From: Popov, Pavel E <[email protected]> > > Sent: Tuesday, October 20, 2026 10:38 AM > > To: Bjorn Helgaas <[email protected]>; Logan Gunthorpe > > <[email protected]> > > Cc: Popov, Pavel E <[email protected]>; Leon Romanovsky > > <[email protected]>; Lukas Wunner <[email protected]>; Jim Chow > > <[email protected]>; Radu Rugina <[email protected]>; > > Alexey Makhalov <[email protected]>; Wei Liu > > <[email protected]>; Michael Kelley <[email protected]>; Nathan > > Ciobanu <[email protected]>; bcm-kernel-feedback- > > [email protected]; [email protected]; linux- > > [email protected]; [email protected]; linux- > > [email protected] > > Subject: [PATCH v4 0/2] PCI/P2PDMA: Allow P2PDMA on Intel Xeon server > > CPUs > > > > 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) > > > > Changes in v3: > > - Drop the hypervisor check and move the Xeon list into > > cpu_supports_p2pdma(), next to the AMD check, as suggested by Logan > > Gunthorpe and Leon Romanovsky [1] > > - Fold the VMware and Hyper-V patches into one, as the check no longer > > depends on the hypervisor > > > > Changes in v2: > > - Replace the Skylake-and-newer threshold with an explicit list of Intel > > Xeon server generations, from Skylake-SP to Diamond Rapids (Logan > > Gunthorpe) > > - Move the CONFIG_X86 #ifdef out of hypervisor_supports_p2pdma() > > (Logan Gunthorpe) > > - Rebased on current mainline > > > > [1] https://lore.kernel.org/r/20261016153147.GC219304@unreal > > > > v3: https://lore.kernel.org/r/20261020151305.65218-1- > > [email protected] > > v2: https://lore.kernel.org/r/20261016223402.19991-1- > > [email protected] > > v1: https://lore.kernel.org/r/20261009154034.82321-1- > > [email protected] > > > > Pavel Popov (2): > > PCI/P2PDMA: Move CONFIG_X86 #ifdef out of cpu_supports_p2pdma() > > PCI/P2PDMA: Allow P2PDMA on Intel Xeon server CPUs > > > > drivers/pci/p2pdma.c | 33 +++++++++++++++++++++++++++++++-- > > 1 file changed, 31 insertions(+), 2 deletions(-) > > > > > > base-commit: c03c1a14507dfaf8b856c2608f9ac216021fc222 > > -- > > 2.53.0 >
