Re: [Qemu-devel] [PATCH v6 00/26] IOMMU: Enable interrupt remapping for Intel IOMMU

["Radim Krčmář" <rkrcmar@redhat.com>]

2016-05-09 19:15+0200, Radim Krčmář:
> From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@redhat.com>
> Date: Mon, 9 May 2016 19:04:56 +0200
> Subject: [PATCH] intel_iommu: support all masks in interrupt entry cache
>  invalidation
> 
> Linux guests do not gracefully handle cases when the invalidation mask
> they wanted is not supported, probably because real hardware always
> allowed all.
> 
> We can just say that all 16 masks are supported, because both
> ioapic_iec_notifier and kvm_update_msi_routes_all invalidate all caches.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
> ---
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> @@ -2359,7 +2359,7 @@ static void vtd_init(IntelIOMMUState *s)
>      s->ecap = VTD_ECAP_QI | VTD_ECAP_IRO;
>  
>      if (ms->iommu_intr) {
> -        s->ecap |= VTD_ECAP_IR | VTD_ECAP_EIM;
> +        s->ecap |= VTD_ECAP_IR | VTD_ECAP_EIM | VTD_ECAP_MHVM;

Eh, I really cannot spell ... this one should read VTD_ECAP_MHMV.
(... or compile after a last-second renaming.)

> diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
> @@ -186,6 +186,7 @@
> +#define VTD_ECAP_MHMV               (15ULL << 20)