On Mon, Oct 05 2020 at 16:28, David Woodhouse wrote:
> -static void __irq_msi_compose_msg(struct irq_cfg *cfg, struct msi_msg *msg)
> +static void __irq_msi_compose_msg(struct irq_cfg *cfg, struct msi_msg *msg,
> int dmar)
bool dmar?
> +/*
> + * The Intel IOMMU (ab)uses the high bits of the MSI
From: David Woodhouse
The Intel IOMMU has an MSI-like configuration for its interrupt, but
it isn't really MSI. So it gets to abuse the high 32 bits of the address,
and puts the high 24 bits of the extended APIC ID there.
This isn't something that can be used in the general case for real MSIs,
s
