kvm: introduce kvm_arch_msi_data_to_gsi
On ARM the MSI data corresponds to the shared peripheral interrupt (SPI) ID. This latter equals to the SPI index + 32. to retrieve the SPI index, matching the gsi, an architecture specific function is introduced. Signed-off-by: NEric Auger <eric.auger@linaro.org> Acked-by: NChristoffer Dall <christoffer.dall@linaro.org> Acked-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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