Re: [PATCH 3/3] intel_iommu: Add missed reserved bit check for IEC descriptor

[CLEMENT MATHIEU--DRIF]

Hi,

lgtm

Thanks
cmd



On 04/11/2024 13:55, Zhenzhong Duan wrote:
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>
> IEC descriptor is 128-bit invalidation descriptor, must be padded with
> 128-bits of 0s in the upper bytes to create a 256-bit descriptor when
> the invalidation queue is configured for 256-bit descriptors (IQA_REG.DW=1).
>
> Fixes: 02a2cbc872df ("x86-iommu: introduce IEC notifiers")
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> ---
>   hw/i386/intel_iommu_internal.h | 3 +++
>   hw/i386/intel_iommu.c          | 8 ++++++++
>   2 files changed, 11 insertions(+)
>
> diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
> index 75ccd501b0..4323fc5d6d 100644
> --- a/hw/i386/intel_iommu_internal.h
> +++ b/hw/i386/intel_iommu_internal.h
> @@ -410,6 +410,9 @@ typedef union VTDInvDesc VTDInvDesc;
>   #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
>   #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0f1f0
>
> +/* Masks for Interrupt Entry Invalidate Descriptor */
> +#define VTD_INV_DESC_IEC_RSVD           0xffff000007fff1e0ULL
> +
>   /* Rsvd field masks for spte */
>   #define VTD_SPTE_SNP 0x800ULL
>
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 2fc3866433..4c0d1d7d47 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -2692,6 +2692,14 @@ static bool vtd_process_iotlb_desc(IntelIOMMUState *s, 
> VTDInvDesc *inv_desc)
>   static bool vtd_process_inv_iec_desc(IntelIOMMUState *s,
>                                        VTDInvDesc *inv_desc)
>   {
> +    uint64_t mask[4] = {VTD_INV_DESC_IEC_RSVD, VTD_INV_DESC_ALL_ONE,
> +                        VTD_INV_DESC_ALL_ONE, VTD_INV_DESC_ALL_ONE};
> +
> +    if (!vtd_inv_desc_reserved_check(s, inv_desc, mask, false,
> +                                     __func__, "iec inv")) {
> +        return false;
> +    }
> +
>       trace_vtd_inv_desc_iec(inv_desc->iec.granularity,
>                              inv_desc->iec.index,
>                              inv_desc->iec.index_mask);
> --
> 2.34.1
>