mbox series

[0/9] PCI devices passthrough on Arm, part 3

Message ID 20210903100831.177748-1-andr2000@gmail.com (mailing list archive)
Headers show
Series PCI devices passthrough on Arm, part 3 | expand

Message

Oleksandr Andrushchenko Sept. 3, 2021, 10:08 a.m. UTC 
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>

Hi, all!

This patch series is focusing on vPCI and adds support for non-identity
PCI BAR mappings which is required while passing through a PCI device to
a guest. The highlights are:

- Add relevant vpci register handlers when assigning PCI device to a domain
  and remove those when de-assigning. This allows having different
  handlers for different domains, e.g. hwdom and other guests.

- Emulate guest BAR register values based on physical BAR values.
  This allows creating a guest view of the registers and emulates
  size and properties probe as it is done during PCI device enumeration by
  the guest.

- Instead of handling a single range set, that contains all the memory
  regions of all the BARs and ROM, have them per BAR.

- Take into account guest's BAR view and program its p2m accordingly:
  gfn is guest's view of the BAR and mfn is the physical BAR value as set
  up by the host bridge in the hardware domain.
  This way hardware doamin sees physical BAR values and guest sees
  emulated ones.

The series was also tested on x86 PVH Dom0 and doesn't break it.

Thank you,
Oleksandr

Oleksandr Andrushchenko (8):
  vpci: Make vpci registers removal a dedicated function
  vpci: Add hooks for PCI device assign/de-assign
  vpci/header: Move register assignments from init_bars
  vpci/header: Add and remove register handlers dynamically
  vpci/header: Implement guest BAR register handlers
  vpci/header: Handle p2m range sets per BAR
  vpci/header: program p2m with guest BAR view
  vpci/header: Reset the command register when adding devices

Rahul Singh (1):
  vpci/header: Use pdev's domain instead of vCPU

 xen/drivers/passthrough/pci.c |   9 +
 xen/drivers/vpci/header.c     | 431 +++++++++++++++++++++++++++-------
 xen/drivers/vpci/vpci.c       |  28 ++-
 xen/include/xen/pci_regs.h    |   1 +
 xen/include/xen/vpci.h        |  28 ++-
 5 files changed, 413 insertions(+), 84 deletions(-)