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xen-pciback: notify hypervisor about devices intended to be assigned to guests

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For MSI-X capable devices the hypervisor wants to write protect the
MSI-X table and PBA, yet it can't assume that resources have been
assigned to their final values at device enumeration time. Thus have
pciback do that notification, as having the device controlled by it is
a prerequisite to assigning the device to guests anyway.

This is the kernel part of hypervisor side commit 4245d33 ("x86/MSI:
add mechanism to fully protect MSI-X table from PV guest accesses") on
the master branch of git://xenbits.xen.org/xen.git.

CC: stable@vger.kernel.org
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Jan Beulich 2013-03-12 15:06:23 +00:00 • committed by Konrad Rzeszutek Wilk
parent 949dd8c14f
commit 909b3fdb0d
4 changed files with 54 additions and 18 deletions
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6
include/xen/interface/physdev.h
View file

@ -251,6 +251,12 @@ struct physdev_pci_device_add {
#define PHYSDEVOP_pci_device_remove 26
#define PHYSDEVOP_restore_msi_ext 27
/*
* Dom0 should use these two to announce MMIO resources assigned to
* MSI-X capable devices won't (prepare) or may (release) change.
*/
#define PHYSDEVOP_prepare_msix 30
#define PHYSDEVOP_release_msix 31
struct physdev_pci_device {
/* IN */
uint16_t seg;