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Re: [PATCH 1/3] intel-iommu: fail MAP notifier without caching mode
From: |
Eric Auger |
Subject: |
Re: [PATCH 1/3] intel-iommu: fail MAP notifier without caching mode |
Date: |
Tue, 6 Dec 2022 14:23:59 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.1 |
Hi Jason,
On 11/29/22 09:10, Jason Wang wrote:
> Without caching mode, MAP notifier won't work correctly since guest
> won't send IOTLB update event when it establishes new mappings in the
> I/O page tables. Let's fail the IOMMU notifiers early instead of
> misbehaving silently.
>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Thanks
Eric
> ---
> hw/i386/intel_iommu.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index a08ee85edf..9143376677 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -3186,6 +3186,13 @@ static int
> vtd_iommu_notify_flag_changed(IOMMUMemoryRegion *iommu,
> "Snoop Control with vhost or VFIO is not
> supported");
> return -ENOTSUP;
> }
> + if (!s->caching_mode && (new & IOMMU_NOTIFIER_MAP)) {
> + error_setg_errno(errp, ENOTSUP,
> + "device %02x.%02x.%x requires caching mode",
> + pci_bus_num(vtd_as->bus), PCI_SLOT(vtd_as->devfn),
> + PCI_FUNC(vtd_as->devfn));
> + return -ENOTSUP;
> + }
>
> /* Update per-address-space notifier flags */
> vtd_as->notifier_flags = new;