> From: Aviv B.D
> Sent: Monday, November 28, 2016 11:52 PM
>
> From: "Aviv Ben-David" <bd.a...@gmail.com>
>
> This capability asks the guest to invalidate cache before each map operation.
> We can use this invalidation to trap map operations in the hypervisor.
'in the hypervisor" or "in the guest"?
>
> Signed-off-by: Aviv Ben-David <bd.a...@gmail.com>
> ---
> hw/i386/intel_iommu.c | 5 +++++
> hw/i386/intel_iommu_internal.h | 1 +
> include/hw/i386/intel_iommu.h | 2 ++
> 3 files changed, 8 insertions(+)
>
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 1b706ad..2cf07cd 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -2017,6 +2017,7 @@ static Property vtd_properties[] = {
> DEFINE_PROP_ON_OFF_AUTO("eim", IntelIOMMUState, intr_eim,
> ON_OFF_AUTO_AUTO),
> DEFINE_PROP_BOOL("x-buggy-eim", IntelIOMMUState, buggy_eim, false),
> + DEFINE_PROP_BOOL("cache-mode", IntelIOMMUState, cache_mode_enabled,
> FALSE),
better align with spec - "caching-mode".
> DEFINE_PROP_END_OF_LIST(),
> };
>
> @@ -2391,6 +2392,10 @@ static void vtd_init(IntelIOMMUState *s)
> assert(s->intr_eim != ON_OFF_AUTO_AUTO);
> }
>
> + if (s->cache_mode_enabled) {
> + s->cap |= VTD_CAP_CM;
> + }
> +
> vtd_reset_context_cache(s);
> vtd_reset_iotlb(s);
>
> diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
> index 11abfa2..00cbe0d 100644
> --- a/hw/i386/intel_iommu_internal.h
> +++ b/hw/i386/intel_iommu_internal.h
> @@ -201,6 +201,7 @@
> #define VTD_CAP_MAMV (VTD_MAMV << 48)
> #define VTD_CAP_PSI (1ULL << 39)
> #define VTD_CAP_SLLPS ((1ULL << 34) | (1ULL << 35))
> +#define VTD_CAP_CM (1ULL << 7)
>
> /* Supported Adjusted Guest Address Widths */
> #define VTD_CAP_SAGAW_SHIFT 8
> diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
> index 405c9d1..749eef9 100644
> --- a/include/hw/i386/intel_iommu.h
> +++ b/include/hw/i386/intel_iommu.h
> @@ -257,6 +257,8 @@ struct IntelIOMMUState {
> uint8_t womask[DMAR_REG_SIZE]; /* WO (write only - read returns 0) */
> uint32_t version;
>
> + bool cache_mode_enabled; /* RO - is cap CM enabled? */
> +
> dma_addr_t root; /* Current root table pointer */
> bool root_extended; /* Type of root table (extended or not)
> */
> bool dmar_enabled; /* Set if DMA remapping is enabled */
> --
> 1.9.1
>
