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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2019-02-13 18:21:31 -0500
committerJuergen Gross <jgross@suse.com>2019-02-18 06:49:46 +0100
commit7681f31ec9cdacab4fd10570be924f2cef6669ba (patch)
tree2c4cae265c019954a38b27525a1db464d9d55e31 /drivers/xen/xen-pciback
parentefac6c75dc4b4aac56c4a40e7f4d2e54fcd87834 (diff)
xen/pciback: Don't disable PCI_COMMAND on PCI device reset.
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 af6fc858a35b90e89ea7a7ee58e66628c55c776b "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>
Diffstat (limited to 'drivers/xen/xen-pciback')
-rw-r--r--drivers/xen/xen-pciback/pciback_ops.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/xen/xen-pciback/pciback_ops.c b/drivers/xen/xen-pciback/pciback_ops.c
index ea4a08b83fa0..787966f44589 100644
--- a/drivers/xen/xen-pciback/pciback_ops.c
+++ b/drivers/xen/xen-pciback/pciback_ops.c
@@ -127,8 +127,6 @@ void xen_pcibk_reset_device(struct pci_dev *dev)
if (pci_is_enabled(dev))
pci_disable_device(dev);
- pci_write_config_word(dev, PCI_COMMAND, 0);
-
dev->is_busmaster = 0;
} else {
pci_read_config_word(dev, PCI_COMMAND, &cmd);