Re: [Qemu-devel] [PATCH v6 06/18] intel_iommu: renaming gpa to iova where proper

[Jason Wang <jasowang@redhat.com>]

On 2017年02月03日 16:22, Peter Xu wrote:
> There are lots of places in current intel_iommu.c codes that named
> "iova" as "gpa". It is really confusing to use a name "gpa" in these
> places (which is very easily to be understood as "Guest Physical
> Address", while it's not). To make the codes (much) easier to be read, I
> decided to do this once and for all.
>
> No functional change is made. Only literal ones.
>
> Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: Jason Wang <jasowang@redhat.com>

Actually, there's one more left:

$git grep gpa hw/i386/intel_iommu.c
hw/i386/intel_iommu.c:static int vtd_gpa_to_slpte(VTDContextEntry *ce, 
uint64_t iova, bool is_write,
hw/i386/intel_iommu.c:    ret_fr = vtd_gpa_to_slpte(&ce, addr, is_write, 
&slpte, &level,

> ---
>   hw/i386/intel_iommu.c | 36 ++++++++++++++++++------------------
>   1 file changed, 18 insertions(+), 18 deletions(-)
>
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 86d19bb..a60b337 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -259,7 +259,7 @@ static void vtd_update_iotlb(IntelIOMMUState *s, uint16_t source_id,
>       uint64_t *key = g_malloc(sizeof(*key));
>       uint64_t gfn = vtd_get_iotlb_gfn(addr, level);
>   
> -    VTD_DPRINTF(CACHE, "update iotlb sid 0x%"PRIx16 " gpa 0x%"PRIx64
> +    VTD_DPRINTF(CACHE, "update iotlb sid 0x%"PRIx16 " iova 0x%"PRIx64
>                   " slpte 0x%"PRIx64 " did 0x%"PRIx16, source_id, addr, slpte,
>                   domain_id);
>       if (g_hash_table_size(s->iotlb) >= VTD_IOTLB_MAX_SIZE) {
> @@ -575,12 +575,12 @@ static uint64_t vtd_get_slpte(dma_addr_t base_addr, uint32_t index)
>       return slpte;
>   }
>   
> -/* Given a gpa and the level of paging structure, return the offset of current
> - * level.
> +/* Given an iova and the level of paging structure, return the offset
> + * of current level.
>    */
> -static inline uint32_t vtd_gpa_level_offset(uint64_t gpa, uint32_t level)
> +static inline uint32_t vtd_iova_level_offset(uint64_t iova, uint32_t level)
>   {
> -    return (gpa >> vtd_slpt_level_shift(level)) &
> +    return (iova >> vtd_slpt_level_shift(level)) &
>               ((1ULL << VTD_SL_LEVEL_BITS) - 1);
>   }
>   
> @@ -628,10 +628,10 @@ static bool vtd_slpte_nonzero_rsvd(uint64_t slpte, uint32_t level)
>       }
>   }
>   
> -/* Given the @gpa, get relevant @slptep. @slpte_level will be the last level
> +/* Given the @iova, get relevant @slptep. @slpte_level will be the last level
>    * of the translation, can be used for deciding the size of large page.
>    */
> -static int vtd_gpa_to_slpte(VTDContextEntry *ce, uint64_t gpa, bool is_write,
> +static int vtd_gpa_to_slpte(VTDContextEntry *ce, uint64_t iova, bool is_write,
>                               uint64_t *slptep, uint32_t *slpte_level,
>                               bool *reads, bool *writes)
>   {
> @@ -642,11 +642,11 @@ static int vtd_gpa_to_slpte(VTDContextEntry *ce, uint64_t gpa, bool is_write,
>       uint32_t ce_agaw = vtd_get_agaw_from_context_entry(ce);
>       uint64_t access_right_check;
>   
> -    /* Check if @gpa is above 2^X-1, where X is the minimum of MGAW in CAP_REG
> -     * and AW in context-entry.
> +    /* Check if @iova is above 2^X-1, where X is the minimum of MGAW
> +     * in CAP_REG and AW in context-entry.
>        */
> -    if (gpa & ~((1ULL << MIN(ce_agaw, VTD_MGAW)) - 1)) {
> -        VTD_DPRINTF(GENERAL, "error: gpa 0x%"PRIx64 " exceeds limits", gpa);
> +    if (iova & ~((1ULL << MIN(ce_agaw, VTD_MGAW)) - 1)) {
> +        VTD_DPRINTF(GENERAL, "error: iova 0x%"PRIx64 " exceeds limits", iova);
>           return -VTD_FR_ADDR_BEYOND_MGAW;
>       }
>   
> @@ -654,13 +654,13 @@ static int vtd_gpa_to_slpte(VTDContextEntry *ce, uint64_t gpa, bool is_write,
>       access_right_check = is_write ? VTD_SL_W : VTD_SL_R;
>   
>       while (true) {
> -        offset = vtd_gpa_level_offset(gpa, level);
> +        offset = vtd_iova_level_offset(iova, level);
>           slpte = vtd_get_slpte(addr, offset);
>   
>           if (slpte == (uint64_t)-1) {
>               VTD_DPRINTF(GENERAL, "error: fail to access second-level paging "
> -                        "entry at level %"PRIu32 " for gpa 0x%"PRIx64,
> -                        level, gpa);
> +                        "entry at level %"PRIu32 " for iova 0x%"PRIx64,
> +                        level, iova);
>               if (level == vtd_get_level_from_context_entry(ce)) {
>                   /* Invalid programming of context-entry */
>                   return -VTD_FR_CONTEXT_ENTRY_INV;
> @@ -672,8 +672,8 @@ static int vtd_gpa_to_slpte(VTDContextEntry *ce, uint64_t gpa, bool is_write,
>           *writes = (*writes) && (slpte & VTD_SL_W);
>           if (!(slpte & access_right_check)) {
>               VTD_DPRINTF(GENERAL, "error: lack of %s permission for "
> -                        "gpa 0x%"PRIx64 " slpte 0x%"PRIx64,
> -                        (is_write ? "write" : "read"), gpa, slpte);
> +                        "iova 0x%"PRIx64 " slpte 0x%"PRIx64,
> +                        (is_write ? "write" : "read"), iova, slpte);
>               return is_write ? -VTD_FR_WRITE : -VTD_FR_READ;
>           }
>           if (vtd_slpte_nonzero_rsvd(slpte, level)) {
> @@ -827,7 +827,7 @@ static void vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus,
>       /* Try to fetch slpte form IOTLB */
>       iotlb_entry = vtd_lookup_iotlb(s, source_id, addr);
>       if (iotlb_entry) {
> -        VTD_DPRINTF(CACHE, "hit iotlb sid 0x%"PRIx16 " gpa 0x%"PRIx64
> +        VTD_DPRINTF(CACHE, "hit iotlb sid 0x%"PRIx16 " iova 0x%"PRIx64
>                       " slpte 0x%"PRIx64 " did 0x%"PRIx16, source_id, addr,
>                       iotlb_entry->slpte, iotlb_entry->domain_id);
>           slpte = iotlb_entry->slpte;
> @@ -2033,7 +2033,7 @@ static IOMMUTLBEntry vtd_iommu_translate(MemoryRegion *iommu, hwaddr addr,
>                              is_write, &ret);
>       VTD_DPRINTF(MMU,
>                   "bus %"PRIu8 " slot %"PRIu8 " func %"PRIu8 " devfn %"PRIu8
> -                " gpa 0x%"PRIx64 " hpa 0x%"PRIx64, pci_bus_num(vtd_as->bus),
> +                " iova 0x%"PRIx64 " hpa 0x%"PRIx64, pci_bus_num(vtd_as->bus),
>                   VTD_PCI_SLOT(vtd_as->devfn), VTD_PCI_FUNC(vtd_as->devfn),
>                   vtd_as->devfn, addr, ret.translated_addr);
>       return ret;