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xen: don't allow guest to control MSI mask register

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It's being used by the hypervisor. For now simply mimic a device not
capable of masking, and fully emulate any accesses a guest may issue
nevertheless as simple reads/writes without side effects.

This is XSA-129.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Jan Beulich 2015-06-02 15:07:00 +00:00 • committed by Stefano Stabellini
parent 5c83b2f5b4
commit 7611dae8a6
3 changed files with 90 additions and 14 deletions
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4
hw/pci/msi.c
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@ -21,10 +21,6 @@
#include "hw/pci/msi.h"
#include "qemu/range.h"
/* Eventually those constants should go to Linux pci_regs.h */
#define PCI_MSI_PENDING_32 0x10
#define PCI_MSI_PENDING_64 0x14
/* PCI_MSI_ADDRESS_LO */
#define PCI_MSI_ADDRESS_LO_MASK (~0x3)