diff options
author | Keir Fraser <keir.fraser@citrix.com> | 2010-07-12 10:43:34 +0100 |
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committer | Keir Fraser <keir.fraser@citrix.com> | 2010-07-12 10:43:34 +0100 |
commit | c507b364854c06cc818b62e24ac9df08b92be9ba (patch) | |
tree | f04a4e647cbfd8a4d8383a5dd96819b2144b3997 /xen/arch/x86/msi.c | |
parent | 355938432e87ba88f380c2a119f486b00adebf05 (diff) | |
download | xen-c507b364854c06cc818b62e24ac9df08b92be9ba.tar.gz xen-c507b364854c06cc818b62e24ac9df08b92be9ba.tar.bz2 xen-c507b364854c06cc818b62e24ac9df08b92be9ba.zip |
x86: prevent simultaneous use of MSI and MSI-X
This matches similar checks done in Linux, since no good can come from
a domain trying to enable both MSI and MSI-X on the same device at the
same time.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Diffstat (limited to 'xen/arch/x86/msi.c')
-rw-r--r-- | xen/arch/x86/msi.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c index f6812b2f52..4f16bf23c4 100644 --- a/xen/arch/x86/msi.c +++ b/xen/arch/x86/msi.c @@ -623,6 +623,14 @@ static int __pci_enable_msi(struct msi_info *msi, struct msi_desc **desc) return 0; } + if ( find_msi_entry(pdev, -1, PCI_CAP_ID_MSIX) ) + { + dprintk(XENLOG_WARNING, "MSI-X is already in use on " + "device %02x:%02x.%01x\n", msi->bus, + PCI_SLOT(msi->devfn), PCI_FUNC(msi->devfn)); + return 0; + } + status = msi_capability_init(pdev, msi->irq, desc); return status; } @@ -689,6 +697,14 @@ static int __pci_enable_msix(struct msi_info *msi, struct msi_desc **desc) return 0; } + if ( find_msi_entry(pdev, -1, PCI_CAP_ID_MSI) ) + { + dprintk(XENLOG_WARNING, "MSI is already in use on " + "device %02x:%02x.%01x\n", msi->bus, + PCI_SLOT(msi->devfn), PCI_FUNC(msi->devfn)); + return 0; + } + status = msix_capability_init(pdev, msi, desc); return status; } |