Konrad Rzeszutek Wilk f1613a9e1b xen/pciback: Don't disable PCI_COMMAND on PCI device reset. ... commit 7681f31ec9cdacab4fd10570be924f2cef6669ba upstream. There is no need for this at all. Worst it means that if the guest tries to write to BARs it could lead (on certain platforms) to PCI SERR errors. Please note that with af6fc858a3 "xen-pciback: limit guest control of command register" a guest is still allowed to enable those control bits (safely), but is not allowed to disable them and that therefore a well behaved frontend which enables things before using them will still function correctly. This is done via an write to the configuration register 0x4 which triggers on the backend side: command_write \- pci_enable_device \- pci_enable_device_flags \- do_pci_enable_device \- pcibios_enable_device \-pci_enable_resourcess [which enables the PCI_COMMAND_MEMORY|PCI_COMMAND_IO] However guests (and drivers) which don't do this could cause problems, including the security issues which XSA-120 sought to address. Reported-by: Jan Beulich <jbeulich@suse.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Juergen Gross <jgross@suse.com> Cc: Ben Hutchings <ben.hutchings@codethink.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-06-11 12:24:07 +02:00
..
events	xen: fix GCC warning and remove duplicate EVTCHN_ROW/EVTCHN_COL usage	2018-10-10 08:52:13 +02:00
xen-pciback	xen/pciback: Don't disable PCI_COMMAND on PCI device reset.	2019-06-11 12:24:07 +02:00
xenbus	xen: xenbus: use put_device() instead of kfree()	2018-05-30 07:49:04 +02:00
xenfs
acpi.c
balloon.c
biomerge.c	xen: fix bio vec merging	2017-08-24 17:02:36 -07:00
cpu_hotplug.c	xen: avoid crash in disable_hotplug_cpu	2018-10-10 08:52:13 +02:00
dbgp.c
efi.c
evtchn.c
fallback.c
features.c
gntalloc.c
gntdev.c	xen/gntdev: Fix partial gntdev_mmap() cleanup	2018-03-03 10:19:45 +01:00
grant-table.c	xen/grant-table: Use put_page instead of free_page	2018-05-30 07:48:56 +02:00
Kconfig	xen: XEN_ACPI_PROCESSOR is Dom0-only	2018-02-25 11:03:41 +01:00
Makefile
manage.c	xen/manage: don't complain about an empty value in control/sysrq node	2018-10-10 08:52:13 +02:00
mcelog.c
pci.c
pcpu.c
platform-pci.c
preempt.c
privcmd.c
privcmd.h
swiotlb-xen.c	xen-swiotlb: use actually allocated size on check physical continuous	2018-11-21 09:27:33 +01:00
sys-hypervisor.c
tmem.c
xen-acpi-cpuhotplug.c
xen-acpi-memhotplug.c
xen-acpi-pad.c
xen-acpi-processor.c	xen/acpi: off by one in read_acpi_id()	2018-05-30 07:49:09 +02:00
xen-balloon.c
xen-scsiback.c
xen-selfballoon.c
xen-stub.c
xlate_mmu.c	xen: xlate_mmu: add missing header to fix 'W=1' warning	2018-12-17 21:55:11 +01:00