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msi/msix: added API to set MSI message address and data

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Added (msi|msix)_set_message() function for whoever might
want to use them.

Currently msi_notify()/msix_notify() write to these vectors to
signal the guest about an interrupt so the correct values have to
written there by the guest or QEMU.

For example, POWER guest never initializes MSI/MSIX vectors, instead
it uses RTAS hypercalls. So in order to support MSIX for virtio-pci on
POWER we have to initialize MSI/MSIX message from QEMU.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2012-07-19 10:35:07 +10:00 • committed by Michael S. Tsirkin
parent 0ae1625177
commit 932d4a42af
4 changed files with 32 additions and 0 deletions
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1
hw/msi.h
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@ -31,6 +31,7 @@ struct MSIMessage {
extern bool msi_supported;
void msi_set_message(PCIDevice *dev, MSIMessage msg);
bool msi_enabled(const PCIDevice *dev);
int msi_init(struct PCIDevice *dev, uint8_t offset,
unsigned int nr_vectors, bool msi64bit, bool msi_per_vector_mask);