Re: [Xen-devel] [PATCH 11 of 16] amd iommu: Add a new flag to indication iommuv2 feature enabled or not

[Tim Deegan <tim@xxxxxxx>]

At 16:29 +0100 on 14 Dec (1323880172), Wei Wang wrote:
> # HG changeset patch
> # User Wei Wang <wei.wang2@xxxxxxx>
> # Date 1323875776 -3600
> # Node ID 9a93e064dd3c467ce4b87ddef8739a3573ef547c
> # Parent  001681ff1a0c09c4d04fd8bd45e8d26805686246
> amd iommu: Add a new flag to indication iommuv2 feature enabled or not.
> Hypercalls should return early on non-iommuv2 systems.
> 
> Signed-off-by: Wei Wang <wei.wang2@xxxxxxx>
> 
> diff -r 001681ff1a0c -r 9a93e064dd3c xen/drivers/passthrough/amd/iommu_guest.c
> --- a/xen/drivers/passthrough/amd/iommu_guest.c       Wed Dec 14 16:16:15 
> 2011 +0100
> +++ b/xen/drivers/passthrough/amd/iommu_guest.c       Wed Dec 14 16:16:16 
> 2011 +0100
> @@ -48,6 +48,8 @@
>          (reg)->hi = (val >> 32) & 0xFFFFFFFF; \
>      } while(0)
>  
> +extern bool_t iommuv2_enabled;
> +
>  static unsigned int machine_bdf(struct domain *d, uint16_t guest_bdf)
>  {
>      struct pci_dev *pdev;
> @@ -839,6 +841,9 @@ int guest_iommu_set_base(struct domain *
>      p2m_type_t t;
>      struct guest_iommu *iommu = domain_iommu(d);
>  
> +    if ( !is_hvm_domain(d) && !iommuv2_enabled )
> +        return 1;

Shouldn't that that be || ? (And likewise below) 

Cheers,

Tim.

> +
>      iommu->mmio_base = base;
>      base >>= PAGE_SHIFT;
>  
> @@ -898,7 +903,7 @@ int guest_iommu_init(struct domain* d)
>      struct guest_iommu *iommu;
>      struct hvm_iommu *hd  = domain_hvm_iommu(d);
>  
> -    if ( !is_hvm_domain(d) )
> +    if ( !is_hvm_domain(d) && !iommuv2_enabled )
>          return 0;
>  
>      iommu = xzalloc(struct guest_iommu);
> @@ -940,7 +945,7 @@ void guest_iommu_destroy(struct domain *
>  {
>      struct guest_iommu *iommu;
>  
> -    if ( !is_hvm_domain(d) )
> +    if ( !is_hvm_domain(d) && !iommuv2_enabled )
>          return;
>  
>      iommu = domain_iommu(d);
> @@ -973,7 +978,7 @@ int iommu_bind_bdf(struct domain* d, uin
>      struct pci_dev *pdev;
>      int ret = -ENODEV;
>  
> -    if ( !iommu_found() )
> +    if ( !iommu_found() || !iommuv2_enabled )
>          return 0;
>  
>      spin_lock(&pcidevs_lock);
> @@ -998,7 +1003,7 @@ void iommu_set_msi(struct domain* d, uin
>  {
>      struct guest_iommu *iommu = domain_iommu(d);
>  
> -    if ( !iommu_found() )
> +    if ( !iommu_found() || !iommuv2_enabled )
>          return;
>  
>      iommu->msi.vector = vector;
> diff -r 001681ff1a0c -r 9a93e064dd3c xen/drivers/passthrough/amd/iommu_init.c
> --- a/xen/drivers/passthrough/amd/iommu_init.c        Wed Dec 14 16:16:15 
> 2011 +0100
> +++ b/xen/drivers/passthrough/amd/iommu_init.c        Wed Dec 14 16:16:16 
> 2011 +0100
> @@ -36,6 +36,7 @@ unsigned short ivrs_bdf_entries;
>  static struct radix_tree_root ivrs_maps;
>  struct list_head amd_iommu_head;
>  struct table_struct device_table;
> +bool_t iommuv2_enabled;
>  
>  static int iommu_has_ht_flag(struct amd_iommu *iommu, u8 mask)
>  {
> @@ -759,6 +760,10 @@ static void enable_iommu(struct amd_iomm
>          amd_iommu_flush_all_caches(iommu);
>  
>      iommu->enabled = 1;
> +
> +    if ( iommu->features )
> +        iommuv2_enabled = 1;
> +
>      spin_unlock_irqrestore(&iommu->lock, flags);
>  
>  }
> 
> 
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