[v3] intel_iommu: Enable stage-1 translation for emulated device

[PATCH v3 12/17] intel_iommu: Add support for PASID-based device IOTLB invalidation

Posted by Zhenzhong Duan 1 year, 4 months ago

From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>

Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/i386/intel_iommu_internal.h | 11 ++++++++
 hw/i386/intel_iommu.c          | 50 ++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)

diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index 4f2c3a9350..52bdbf3bc5 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -375,6 +375,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait Descriptor */
 #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate Desc */
 #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate Desc */
+#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB inv_desc*/
 #define VTD_INV_DESC_NONE               0   /* Not an Invalidate Descriptor */
 
 /* Masks for Invalidation Wait Descriptor*/
@@ -413,6 +414,16 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
 #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
 
+/* Mask for PASID Device IOTLB Invalidate Descriptor */
+#define VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(val) ((val) & \
+                                                   0xfffffffffffff000ULL)
+#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(val) ((val >> 11) & 0x1)
+#define VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(val) ((val) & 0x1)
+#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(val) (((val) >> 16) & 0xffffULL)
+#define VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(val) ((val >> 32) & 0xfffffULL)
+#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI 0x7feULL
+#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO 0xfff000000000f000ULL
+
 /* 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 d28c862598..4cf56924e1 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3017,6 +3017,49 @@ static void do_invalidate_device_tlb(VTDAddressSpace *vtd_dev_as,
     memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
 }
 
+static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
+                                           VTDInvDesc *inv_desc)
+{
+    uint16_t sid;
+    VTDAddressSpace *vtd_dev_as;
+    bool size;
+    bool global;
+    hwaddr addr;
+    uint32_t pasid;
+
+    if ((inv_desc->hi & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI) ||
+         (inv_desc->lo & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO)) {
+        error_report_once("%s: invalid pasid-based dev iotlb inv desc:"
+                          "hi=%"PRIx64 "(reserved nonzero)",
+                          __func__, inv_desc->hi);
+        return false;
+    }
+
+    global = VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(inv_desc->hi);
+    size = VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(inv_desc->hi);
+    addr = VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(inv_desc->hi);
+    sid = VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(inv_desc->lo);
+    if (global) {
+        QLIST_FOREACH(vtd_dev_as, &s->vtd_as_with_notifiers, next) {
+            if ((vtd_dev_as->pasid != PCI_NO_PASID) &&
+                (PCI_BUILD_BDF(pci_bus_num(vtd_dev_as->bus),
+                                           vtd_dev_as->devfn) == sid)) {
+                do_invalidate_device_tlb(vtd_dev_as, size, addr);
+            }
+        }
+    } else {
+        pasid = VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(inv_desc->lo);
+        vtd_dev_as = vtd_get_as_by_sid_and_pasid(s, sid, pasid);
+        if (!vtd_dev_as) {
+            return true;
+        }
+
+        do_invalidate_device_tlb(vtd_dev_as, size, addr);
+    }
+
+    return true;
+}
+
 static bool vtd_process_device_iotlb_desc(IntelIOMMUState *s,
                                           VTDInvDesc *inv_desc)
 {
@@ -3111,6 +3154,13 @@ static bool vtd_process_inv_desc(IntelIOMMUState *s)
         }
         break;
 
+    case VTD_INV_DESC_DEV_PIOTLB:
+        trace_vtd_inv_desc("device-piotlb", inv_desc.hi, inv_desc.lo);
+        if (!vtd_process_device_piotlb_desc(s, &inv_desc)) {
+            return false;
+        }
+        break;
+
     case VTD_INV_DESC_DEVICE:
         trace_vtd_inv_desc("device", inv_desc.hi, inv_desc.lo);
         if (!vtd_process_device_iotlb_desc(s, &inv_desc)) {
-- 
2.34.1

Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device IOTLB invalidation

Posted by Jason Wang 1 year, 4 months ago

On Wed, Sep 11, 2024 at 1:27 PM Zhenzhong Duan <zhenzhong.duan@intel.com> wrote:
>
> From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
>
> Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> ---
>  hw/i386/intel_iommu_internal.h | 11 ++++++++
>  hw/i386/intel_iommu.c          | 50 ++++++++++++++++++++++++++++++++++
>  2 files changed, 61 insertions(+)
>
> diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
> index 4f2c3a9350..52bdbf3bc5 100644
> --- a/hw/i386/intel_iommu_internal.h
> +++ b/hw/i386/intel_iommu_internal.h
> @@ -375,6 +375,7 @@ typedef union VTDInvDesc VTDInvDesc;
>  #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait Descriptor */
>  #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate Desc */
>  #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate Desc */
> +#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB inv_desc*/
>  #define VTD_INV_DESC_NONE               0   /* Not an Invalidate Descriptor */
>
>  /* Masks for Invalidation Wait Descriptor*/
> @@ -413,6 +414,16 @@ typedef union VTDInvDesc VTDInvDesc;
>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
>
> +/* Mask for PASID Device IOTLB Invalidate Descriptor */
> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(val) ((val) & \
> +                                                   0xfffffffffffff000ULL)
> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(val) ((val >> 11) & 0x1)
> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(val) ((val) & 0x1)
> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(val) (((val) >> 16) & 0xffffULL)
> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(val) ((val >> 32) & 0xfffffULL)
> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI 0x7feULL
> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO 0xfff000000000f000ULL
> +
>  /* 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 d28c862598..4cf56924e1 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -3017,6 +3017,49 @@ static void do_invalidate_device_tlb(VTDAddressSpace *vtd_dev_as,
>      memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
>  }
>
> +static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
> +                                           VTDInvDesc *inv_desc)
> +{
> +    uint16_t sid;
> +    VTDAddressSpace *vtd_dev_as;
> +    bool size;
> +    bool global;
> +    hwaddr addr;
> +    uint32_t pasid;
> +
> +    if ((inv_desc->hi & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI) ||
> +         (inv_desc->lo & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO)) {
> +        error_report_once("%s: invalid pasid-based dev iotlb inv desc:"
> +                          "hi=%"PRIx64 "(reserved nonzero)",
> +                          __func__, inv_desc->hi);
> +        return false;
> +    }
> +
> +    global = VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(inv_desc->hi);
> +    size = VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(inv_desc->hi);
> +    addr = VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(inv_desc->hi);
> +    sid = VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(inv_desc->lo);
> +    if (global) {
> +        QLIST_FOREACH(vtd_dev_as, &s->vtd_as_with_notifiers, next) {
> +            if ((vtd_dev_as->pasid != PCI_NO_PASID) &&
> +                (PCI_BUILD_BDF(pci_bus_num(vtd_dev_as->bus),
> +                                           vtd_dev_as->devfn) == sid)) {
> +                do_invalidate_device_tlb(vtd_dev_as, size, addr);
> +            }
> +        }
> +    } else {
> +        pasid = VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(inv_desc->lo);
> +        vtd_dev_as = vtd_get_as_by_sid_and_pasid(s, sid, pasid);
> +        if (!vtd_dev_as) {
> +            return true;
> +        }
> +
> +        do_invalidate_device_tlb(vtd_dev_as, size, addr);

Question:

I wonder if current vhost (which has a device IOTLB abstraction via
virtio-pci) can work with this (PASID based IOTLB invalidation)

THanks


> +    }
> +
> +    return true;
> +}
> +
>  static bool vtd_process_device_iotlb_desc(IntelIOMMUState *s,
>                                            VTDInvDesc *inv_desc)
>  {
> @@ -3111,6 +3154,13 @@ static bool vtd_process_inv_desc(IntelIOMMUState *s)
>          }
>          break;
>
> +    case VTD_INV_DESC_DEV_PIOTLB:
> +        trace_vtd_inv_desc("device-piotlb", inv_desc.hi, inv_desc.lo);
> +        if (!vtd_process_device_piotlb_desc(s, &inv_desc)) {
> +            return false;
> +        }
> +        break;
> +
>      case VTD_INV_DESC_DEVICE:
>          trace_vtd_inv_desc("device", inv_desc.hi, inv_desc.lo);
>          if (!vtd_process_device_iotlb_desc(s, &inv_desc)) {
> --
> 2.34.1
>

RE: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device IOTLB invalidation

Posted by Duan, Zhenzhong 1 year, 4 months ago


>-----Original Message-----
>From: Jason Wang <jasowang@redhat.com>
>Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based
>device IOTLB invalidation
>
>On Wed, Sep 11, 2024 at 1:27 PM Zhenzhong Duan
><zhenzhong.duan@intel.com> wrote:
>>
>> From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
>>
>> Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>> ---
>>  hw/i386/intel_iommu_internal.h | 11 ++++++++
>>  hw/i386/intel_iommu.c          | 50
>++++++++++++++++++++++++++++++++++
>>  2 files changed, 61 insertions(+)
>>
>> diff --git a/hw/i386/intel_iommu_internal.h
>b/hw/i386/intel_iommu_internal.h
>> index 4f2c3a9350..52bdbf3bc5 100644
>> --- a/hw/i386/intel_iommu_internal.h
>> +++ b/hw/i386/intel_iommu_internal.h
>> @@ -375,6 +375,7 @@ typedef union VTDInvDesc VTDInvDesc;
>>  #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait Descriptor
>*/
>>  #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate Desc
>*/
>>  #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate Desc */
>> +#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB
>inv_desc*/
>>  #define VTD_INV_DESC_NONE               0   /* Not an Invalidate Descriptor
>*/
>>
>>  /* Masks for Invalidation Wait Descriptor*/
>> @@ -413,6 +414,16 @@ typedef union VTDInvDesc VTDInvDesc;
>>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
>>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
>>
>> +/* Mask for PASID Device IOTLB Invalidate Descriptor */
>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(val) ((val) & \
>> +                                                   0xfffffffffffff000ULL)
>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(val) ((val >> 11) & 0x1)
>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(val) ((val) & 0x1)
>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(val) (((val) >> 16) &
>0xffffULL)
>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(val) ((val >> 32) &
>0xfffffULL)
>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI 0x7feULL
>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO
>0xfff000000000f000ULL
>> +
>>  /* 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 d28c862598..4cf56924e1 100644
>> --- a/hw/i386/intel_iommu.c
>> +++ b/hw/i386/intel_iommu.c
>> @@ -3017,6 +3017,49 @@ static void
>do_invalidate_device_tlb(VTDAddressSpace *vtd_dev_as,
>>      memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
>>  }
>>
>> +static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
>> +                                           VTDInvDesc *inv_desc)
>> +{
>> +    uint16_t sid;
>> +    VTDAddressSpace *vtd_dev_as;
>> +    bool size;
>> +    bool global;
>> +    hwaddr addr;
>> +    uint32_t pasid;
>> +
>> +    if ((inv_desc->hi & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI) ||
>> +         (inv_desc->lo & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO)) {
>> +        error_report_once("%s: invalid pasid-based dev iotlb inv desc:"
>> +                          "hi=%"PRIx64 "(reserved nonzero)",
>> +                          __func__, inv_desc->hi);
>> +        return false;
>> +    }
>> +
>> +    global = VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(inv_desc->hi);
>> +    size = VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(inv_desc->hi);
>> +    addr = VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(inv_desc->hi);
>> +    sid = VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(inv_desc->lo);
>> +    if (global) {
>> +        QLIST_FOREACH(vtd_dev_as, &s->vtd_as_with_notifiers, next) {
>> +            if ((vtd_dev_as->pasid != PCI_NO_PASID) &&
>> +                (PCI_BUILD_BDF(pci_bus_num(vtd_dev_as->bus),
>> +                                           vtd_dev_as->devfn) == sid)) {
>> +                do_invalidate_device_tlb(vtd_dev_as, size, addr);
>> +            }
>> +        }
>> +    } else {
>> +        pasid = VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(inv_desc->lo);
>> +        vtd_dev_as = vtd_get_as_by_sid_and_pasid(s, sid, pasid);
>> +        if (!vtd_dev_as) {
>> +            return true;
>> +        }
>> +
>> +        do_invalidate_device_tlb(vtd_dev_as, size, addr);
>
>Question:
>
>I wonder if current vhost (which has a device IOTLB abstraction via
>virtio-pci) can work with this (PASID based IOTLB invalidation)

Currently, it depends on if caching-mode is on. If it's off, vhost works. E.g.:

-device intel-iommu,caching-mode=off,dma-drain=on,device-iotlb=on,x-scalable-mode=on
-netdev tap,id=tap0,vhost=on,script=/etc/qemu-ifup
-device virtio-net-pci,netdev=tap0,bus=root0,iommu_platform=on,ats=on

It doesn't work currently when caching-mode is on.
Reason is linux kernel has an optimization to send only piotlb invalidation,
no device-piotlb invalidation is sent. But I heard from Yi the optimization
will be dropped, then it will work too when caching-mode is on.

Thanks
Zhenzhong

Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device IOTLB invalidation

Posted by Jason Wang 1 year, 4 months ago

On Fri, Sep 27, 2024 at 3:18 PM Duan, Zhenzhong
<zhenzhong.duan@intel.com> wrote:
>
>
>
> >-----Original Message-----
> >From: Jason Wang <jasowang@redhat.com>
> >Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based
> >device IOTLB invalidation
> >
> >On Wed, Sep 11, 2024 at 1:27 PM Zhenzhong Duan
> ><zhenzhong.duan@intel.com> wrote:
> >>
> >> From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
> >>
> >> Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
> >> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> >> ---
> >>  hw/i386/intel_iommu_internal.h | 11 ++++++++
> >>  hw/i386/intel_iommu.c          | 50
> >++++++++++++++++++++++++++++++++++
> >>  2 files changed, 61 insertions(+)
> >>
> >> diff --git a/hw/i386/intel_iommu_internal.h
> >b/hw/i386/intel_iommu_internal.h
> >> index 4f2c3a9350..52bdbf3bc5 100644
> >> --- a/hw/i386/intel_iommu_internal.h
> >> +++ b/hw/i386/intel_iommu_internal.h
> >> @@ -375,6 +375,7 @@ typedef union VTDInvDesc VTDInvDesc;
> >>  #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait Descriptor
> >*/
> >>  #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate Desc
> >*/
> >>  #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate Desc */
> >> +#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB
> >inv_desc*/
> >>  #define VTD_INV_DESC_NONE               0   /* Not an Invalidate Descriptor
> >*/
> >>
> >>  /* Masks for Invalidation Wait Descriptor*/
> >> @@ -413,6 +414,16 @@ typedef union VTDInvDesc VTDInvDesc;
> >>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
> >>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
> >>
> >> +/* Mask for PASID Device IOTLB Invalidate Descriptor */
> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(val) ((val) & \
> >> +                                                   0xfffffffffffff000ULL)
> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(val) ((val >> 11) & 0x1)
> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(val) ((val) & 0x1)
> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(val) (((val) >> 16) &
> >0xffffULL)
> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(val) ((val >> 32) &
> >0xfffffULL)
> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI 0x7feULL
> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO
> >0xfff000000000f000ULL
> >> +
> >>  /* 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 d28c862598..4cf56924e1 100644
> >> --- a/hw/i386/intel_iommu.c
> >> +++ b/hw/i386/intel_iommu.c
> >> @@ -3017,6 +3017,49 @@ static void
> >do_invalidate_device_tlb(VTDAddressSpace *vtd_dev_as,
> >>      memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
> >>  }
> >>
> >> +static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
> >> +                                           VTDInvDesc *inv_desc)
> >> +{
> >> +    uint16_t sid;
> >> +    VTDAddressSpace *vtd_dev_as;
> >> +    bool size;
> >> +    bool global;
> >> +    hwaddr addr;
> >> +    uint32_t pasid;
> >> +
> >> +    if ((inv_desc->hi & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI) ||
> >> +         (inv_desc->lo & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO)) {
> >> +        error_report_once("%s: invalid pasid-based dev iotlb inv desc:"
> >> +                          "hi=%"PRIx64 "(reserved nonzero)",
> >> +                          __func__, inv_desc->hi);
> >> +        return false;
> >> +    }
> >> +
> >> +    global = VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(inv_desc->hi);
> >> +    size = VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(inv_desc->hi);
> >> +    addr = VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(inv_desc->hi);
> >> +    sid = VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(inv_desc->lo);
> >> +    if (global) {
> >> +        QLIST_FOREACH(vtd_dev_as, &s->vtd_as_with_notifiers, next) {
> >> +            if ((vtd_dev_as->pasid != PCI_NO_PASID) &&
> >> +                (PCI_BUILD_BDF(pci_bus_num(vtd_dev_as->bus),
> >> +                                           vtd_dev_as->devfn) == sid)) {
> >> +                do_invalidate_device_tlb(vtd_dev_as, size, addr);
> >> +            }
> >> +        }
> >> +    } else {
> >> +        pasid = VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(inv_desc->lo);
> >> +        vtd_dev_as = vtd_get_as_by_sid_and_pasid(s, sid, pasid);
> >> +        if (!vtd_dev_as) {
> >> +            return true;
> >> +        }
> >> +
> >> +        do_invalidate_device_tlb(vtd_dev_as, size, addr);
> >
> >Question:
> >
> >I wonder if current vhost (which has a device IOTLB abstraction via
> >virtio-pci) can work with this (PASID based IOTLB invalidation)
>
> Currently, it depends on if caching-mode is on. If it's off, vhost works. E.g.:
>
> -device intel-iommu,caching-mode=off,dma-drain=on,device-iotlb=on,x-scalable-mode=on
> -netdev tap,id=tap0,vhost=on,script=/etc/qemu-ifup
> -device virtio-net-pci,netdev=tap0,bus=root0,iommu_platform=on,ats=on
>
> It doesn't work currently when caching-mode is on.
> Reason is linux kernel has an optimization to send only piotlb invalidation,
> no device-piotlb invalidation is sent. But I heard from Yi the optimization
> will be dropped, then it will work too when caching-mode is on.

Great, if possible please copy me when sending those fixes.

Thanks

>
> Thanks
> Zhenzhong

RE: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device IOTLB invalidation

Posted by Duan, Zhenzhong 1 year, 1 month ago


>-----Original Message-----
>From: Jason Wang <jasowang@redhat.com>
>Sent: Sunday, September 29, 2024 9:59 AM
>Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device
>IOTLB invalidation
>
>On Fri, Sep 27, 2024 at 3:18 PM Duan, Zhenzhong
><zhenzhong.duan@intel.com> wrote:
>>
>>
>>
>> >-----Original Message-----
>> >From: Jason Wang <jasowang@redhat.com>
>> >Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based
>> >device IOTLB invalidation
>> >
>> >On Wed, Sep 11, 2024 at 1:27 PM Zhenzhong Duan
>> ><zhenzhong.duan@intel.com> wrote:
>> >>
>> >> From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
>> >>
>> >> Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
>> >> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>> >> ---
>> >>  hw/i386/intel_iommu_internal.h | 11 ++++++++
>> >>  hw/i386/intel_iommu.c          | 50
>> >++++++++++++++++++++++++++++++++++
>> >>  2 files changed, 61 insertions(+)
>> >>
>> >> diff --git a/hw/i386/intel_iommu_internal.h
>> >b/hw/i386/intel_iommu_internal.h
>> >> index 4f2c3a9350..52bdbf3bc5 100644
>> >> --- a/hw/i386/intel_iommu_internal.h
>> >> +++ b/hw/i386/intel_iommu_internal.h
>> >> @@ -375,6 +375,7 @@ typedef union VTDInvDesc VTDInvDesc;
>> >>  #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait Descriptor
>> >*/
>> >>  #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate Desc
>> >*/
>> >>  #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate Desc */
>> >> +#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB
>> >inv_desc*/
>> >>  #define VTD_INV_DESC_NONE               0   /* Not an Invalidate Descriptor
>> >*/
>> >>
>> >>  /* Masks for Invalidation Wait Descriptor*/
>> >> @@ -413,6 +414,16 @@ typedef union VTDInvDesc VTDInvDesc;
>> >>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
>> >>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
>> >>
>> >> +/* Mask for PASID Device IOTLB Invalidate Descriptor */
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(val) ((val) & \
>> >> +                                                   0xfffffffffffff000ULL)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(val) ((val >> 11) & 0x1)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(val) ((val) & 0x1)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(val) (((val) >> 16) &
>> >0xffffULL)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(val) ((val >> 32) &
>> >0xfffffULL)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI 0x7feULL
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO
>> >0xfff000000000f000ULL
>> >> +
>> >>  /* 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 d28c862598..4cf56924e1 100644
>> >> --- a/hw/i386/intel_iommu.c
>> >> +++ b/hw/i386/intel_iommu.c
>> >> @@ -3017,6 +3017,49 @@ static void
>> >do_invalidate_device_tlb(VTDAddressSpace *vtd_dev_as,
>> >>      memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
>> >>  }
>> >>
>> >> +static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
>> >> +                                           VTDInvDesc *inv_desc)
>> >> +{
>> >> +    uint16_t sid;
>> >> +    VTDAddressSpace *vtd_dev_as;
>> >> +    bool size;
>> >> +    bool global;
>> >> +    hwaddr addr;
>> >> +    uint32_t pasid;
>> >> +
>> >> +    if ((inv_desc->hi & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI) ||
>> >> +         (inv_desc->lo & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO)) {
>> >> +        error_report_once("%s: invalid pasid-based dev iotlb inv desc:"
>> >> +                          "hi=%"PRIx64 "(reserved nonzero)",
>> >> +                          __func__, inv_desc->hi);
>> >> +        return false;
>> >> +    }
>> >> +
>> >> +    global = VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(inv_desc->hi);
>> >> +    size = VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(inv_desc->hi);
>> >> +    addr = VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(inv_desc->hi);
>> >> +    sid = VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(inv_desc->lo);
>> >> +    if (global) {
>> >> +        QLIST_FOREACH(vtd_dev_as, &s->vtd_as_with_notifiers, next) {
>> >> +            if ((vtd_dev_as->pasid != PCI_NO_PASID) &&
>> >> +                (PCI_BUILD_BDF(pci_bus_num(vtd_dev_as->bus),
>> >> +                                           vtd_dev_as->devfn) == sid)) {
>> >> +                do_invalidate_device_tlb(vtd_dev_as, size, addr);
>> >> +            }
>> >> +        }
>> >> +    } else {
>> >> +        pasid = VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(inv_desc->lo);
>> >> +        vtd_dev_as = vtd_get_as_by_sid_and_pasid(s, sid, pasid);
>> >> +        if (!vtd_dev_as) {
>> >> +            return true;
>> >> +        }
>> >> +
>> >> +        do_invalidate_device_tlb(vtd_dev_as, size, addr);
>> >
>> >Question:
>> >
>> >I wonder if current vhost (which has a device IOTLB abstraction via
>> >virtio-pci) can work with this (PASID based IOTLB invalidation)
>>
>> Currently, it depends on if caching-mode is on. If it's off, vhost works. E.g.:
>>
>> -device intel-iommu,caching-mode=off,dma-drain=on,device-iotlb=on,x-
>scalable-mode=on
>> -netdev tap,id=tap0,vhost=on,script=/etc/qemu-ifup
>> -device virtio-net-pci,netdev=tap0,bus=root0,iommu_platform=on,ats=on
>>
>> It doesn't work currently when caching-mode is on.
>> Reason is linux kernel has an optimization to send only piotlb invalidation,
>> no device-piotlb invalidation is sent. But I heard from Yi the optimization
>> will be dropped, then it will work too when caching-mode is on.
>
>Great, if possible please copy me when sending those fixes.

FYI, I just found the optimization had already been dropped since April 2024 by commit https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=304b3bde24b58515a75fd198beb52ca57df6275f

After updating guest kernel to a new version containing above commit,
vhost works irrespective the value of caching-mode.

Thanks
Zhenzhong

Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device IOTLB invalidation

Posted by Jason Wang 1 year, 1 month ago

On Mon, Dec 16, 2024 at 4:22 PM Duan, Zhenzhong
<zhenzhong.duan@intel.com> wrote:
>
>
>
> >-----Original Message-----
> >From: Jason Wang <jasowang@redhat.com>
> >Sent: Sunday, September 29, 2024 9:59 AM
> >Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device
> >IOTLB invalidation
> >
> >On Fri, Sep 27, 2024 at 3:18 PM Duan, Zhenzhong
> ><zhenzhong.duan@intel.com> wrote:
> >>
> >>
> >>
> >> >-----Original Message-----
> >> >From: Jason Wang <jasowang@redhat.com>
> >> >Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based
> >> >device IOTLB invalidation
> >> >
> >> >On Wed, Sep 11, 2024 at 1:27 PM Zhenzhong Duan
> >> ><zhenzhong.duan@intel.com> wrote:
> >> >>
> >> >> From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
> >> >>
> >> >> Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
> >> >> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> >> >> ---
> >> >>  hw/i386/intel_iommu_internal.h | 11 ++++++++
> >> >>  hw/i386/intel_iommu.c          | 50
> >> >++++++++++++++++++++++++++++++++++
> >> >>  2 files changed, 61 insertions(+)
> >> >>
> >> >> diff --git a/hw/i386/intel_iommu_internal.h
> >> >b/hw/i386/intel_iommu_internal.h
> >> >> index 4f2c3a9350..52bdbf3bc5 100644
> >> >> --- a/hw/i386/intel_iommu_internal.h
> >> >> +++ b/hw/i386/intel_iommu_internal.h
> >> >> @@ -375,6 +375,7 @@ typedef union VTDInvDesc VTDInvDesc;
> >> >>  #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait Descriptor
> >> >*/
> >> >>  #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate Desc
> >> >*/
> >> >>  #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate Desc */
> >> >> +#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB
> >> >inv_desc*/
> >> >>  #define VTD_INV_DESC_NONE               0   /* Not an Invalidate Descriptor
> >> >*/
> >> >>
> >> >>  /* Masks for Invalidation Wait Descriptor*/
> >> >> @@ -413,6 +414,16 @@ typedef union VTDInvDesc VTDInvDesc;
> >> >>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
> >> >>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
> >> >>
> >> >> +/* Mask for PASID Device IOTLB Invalidate Descriptor */
> >> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(val) ((val) & \
> >> >> +                                                   0xfffffffffffff000ULL)
> >> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(val) ((val >> 11) & 0x1)
> >> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(val) ((val) & 0x1)
> >> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(val) (((val) >> 16) &
> >> >0xffffULL)
> >> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(val) ((val >> 32) &
> >> >0xfffffULL)
> >> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI 0x7feULL
> >> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO
> >> >0xfff000000000f000ULL
> >> >> +
> >> >>  /* 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 d28c862598..4cf56924e1 100644
> >> >> --- a/hw/i386/intel_iommu.c
> >> >> +++ b/hw/i386/intel_iommu.c
> >> >> @@ -3017,6 +3017,49 @@ static void
> >> >do_invalidate_device_tlb(VTDAddressSpace *vtd_dev_as,
> >> >>      memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
> >> >>  }
> >> >>
> >> >> +static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
> >> >> +                                           VTDInvDesc *inv_desc)
> >> >> +{
> >> >> +    uint16_t sid;
> >> >> +    VTDAddressSpace *vtd_dev_as;
> >> >> +    bool size;
> >> >> +    bool global;
> >> >> +    hwaddr addr;
> >> >> +    uint32_t pasid;
> >> >> +
> >> >> +    if ((inv_desc->hi & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI) ||
> >> >> +         (inv_desc->lo & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO)) {
> >> >> +        error_report_once("%s: invalid pasid-based dev iotlb inv desc:"
> >> >> +                          "hi=%"PRIx64 "(reserved nonzero)",
> >> >> +                          __func__, inv_desc->hi);
> >> >> +        return false;
> >> >> +    }
> >> >> +
> >> >> +    global = VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(inv_desc->hi);
> >> >> +    size = VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(inv_desc->hi);
> >> >> +    addr = VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(inv_desc->hi);
> >> >> +    sid = VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(inv_desc->lo);
> >> >> +    if (global) {
> >> >> +        QLIST_FOREACH(vtd_dev_as, &s->vtd_as_with_notifiers, next) {
> >> >> +            if ((vtd_dev_as->pasid != PCI_NO_PASID) &&
> >> >> +                (PCI_BUILD_BDF(pci_bus_num(vtd_dev_as->bus),
> >> >> +                                           vtd_dev_as->devfn) == sid)) {
> >> >> +                do_invalidate_device_tlb(vtd_dev_as, size, addr);
> >> >> +            }
> >> >> +        }
> >> >> +    } else {
> >> >> +        pasid = VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(inv_desc->lo);
> >> >> +        vtd_dev_as = vtd_get_as_by_sid_and_pasid(s, sid, pasid);
> >> >> +        if (!vtd_dev_as) {
> >> >> +            return true;
> >> >> +        }
> >> >> +
> >> >> +        do_invalidate_device_tlb(vtd_dev_as, size, addr);
> >> >
> >> >Question:
> >> >
> >> >I wonder if current vhost (which has a device IOTLB abstraction via
> >> >virtio-pci) can work with this (PASID based IOTLB invalidation)
> >>
> >> Currently, it depends on if caching-mode is on. If it's off, vhost works. E.g.:
> >>
> >> -device intel-iommu,caching-mode=off,dma-drain=on,device-iotlb=on,x-
> >scalable-mode=on
> >> -netdev tap,id=tap0,vhost=on,script=/etc/qemu-ifup
> >> -device virtio-net-pci,netdev=tap0,bus=root0,iommu_platform=on,ats=on
> >>
> >> It doesn't work currently when caching-mode is on.
> >> Reason is linux kernel has an optimization to send only piotlb invalidation,
> >> no device-piotlb invalidation is sent. But I heard from Yi the optimization
> >> will be dropped, then it will work too when caching-mode is on.
> >
> >Great, if possible please copy me when sending those fixes.
>
> FYI, I just found the optimization had already been dropped since April 2024 by commit https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=304b3bde24b58515a75fd198beb52ca57df6275f
>
> After updating guest kernel to a new version containing above commit,
> vhost works irrespective the value of caching-mode.
>
> Thanks
> Zhenzhong

Great. Thanks for the updating.

Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device IOTLB invalidation

Posted by CLEMENT MATHIEU--DRIF 1 year, 1 month ago



On 17/12/2024 03:13, Jason Wang wrote:
> Caution: External email. Do not open attachments or click links, unless this email comes from a known sender and you know the content is safe.
>
>
> On Mon, Dec 16, 2024 at 4:22 PM Duan, Zhenzhong
> <zhenzhong.duan@intel.com> wrote:
>>
>>
>>> -----Original Message-----
>>> From: Jason Wang <jasowang@redhat.com>
>>> Sent: Sunday, September 29, 2024 9:59 AM
>>> Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device
>>> IOTLB invalidation
>>>
>>> On Fri, Sep 27, 2024 at 3:18 PM Duan, Zhenzhong
>>> <zhenzhong.duan@intel.com> wrote:
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Jason Wang <jasowang@redhat.com>
>>>>> Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based
>>>>> device IOTLB invalidation
>>>>>
>>>>> On Wed, Sep 11, 2024 at 1:27 PM Zhenzhong Duan
>>>>> <zhenzhong.duan@intel.com> wrote:
>>>>>> From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
>>>>>>
>>>>>> Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
>>>>>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>>>>>> ---
>>>>>>   hw/i386/intel_iommu_internal.h | 11 ++++++++
>>>>>>   hw/i386/intel_iommu.c          | 50
>>>>> ++++++++++++++++++++++++++++++++++
>>>>>>   2 files changed, 61 insertions(+)
>>>>>>
>>>>>> diff --git a/hw/i386/intel_iommu_internal.h
>>>>> b/hw/i386/intel_iommu_internal.h
>>>>>> index 4f2c3a9350..52bdbf3bc5 100644
>>>>>> --- a/hw/i386/intel_iommu_internal.h
>>>>>> +++ b/hw/i386/intel_iommu_internal.h
>>>>>> @@ -375,6 +375,7 @@ typedef union VTDInvDesc VTDInvDesc;
>>>>>>   #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait Descriptor
>>>>> */
>>>>>>   #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate Desc
>>>>> */
>>>>>>   #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate Desc */
>>>>>> +#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB
>>>>> inv_desc*/
>>>>>>   #define VTD_INV_DESC_NONE               0   /* Not an Invalidate Descriptor
>>>>> */
>>>>>>   /* Masks for Invalidation Wait Descriptor*/
>>>>>> @@ -413,6 +414,16 @@ typedef union VTDInvDesc VTDInvDesc;
>>>>>>   #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
>>>>>>   #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
>>>>>>
>>>>>> +/* Mask for PASID Device IOTLB Invalidate Descriptor */
>>>>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(val) ((val) & \
>>>>>> +                                                   0xfffffffffffff000ULL)
>>>>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(val) ((val >> 11) & 0x1)
>>>>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(val) ((val) & 0x1)
>>>>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(val) (((val) >> 16) &
>>>>> 0xffffULL)
>>>>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(val) ((val >> 32) &
>>>>> 0xfffffULL)
>>>>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI 0x7feULL
>>>>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO
>>>>> 0xfff000000000f000ULL
>>>>>> +
>>>>>>   /* 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 d28c862598..4cf56924e1 100644
>>>>>> --- a/hw/i386/intel_iommu.c
>>>>>> +++ b/hw/i386/intel_iommu.c
>>>>>> @@ -3017,6 +3017,49 @@ static void
>>>>> do_invalidate_device_tlb(VTDAddressSpace *vtd_dev_as,
>>>>>>       memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
>>>>>>   }
>>>>>>
>>>>>> +static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
>>>>>> +                                           VTDInvDesc *inv_desc)
>>>>>> +{
>>>>>> +    uint16_t sid;
>>>>>> +    VTDAddressSpace *vtd_dev_as;
>>>>>> +    bool size;
>>>>>> +    bool global;
>>>>>> +    hwaddr addr;
>>>>>> +    uint32_t pasid;
>>>>>> +
>>>>>> +    if ((inv_desc->hi & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI) ||
>>>>>> +         (inv_desc->lo & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO)) {
>>>>>> +        error_report_once("%s: invalid pasid-based dev iotlb inv desc:"
>>>>>> +                          "hi=%"PRIx64 "(reserved nonzero)",
>>>>>> +                          __func__, inv_desc->hi);
>>>>>> +        return false;
>>>>>> +    }
>>>>>> +
>>>>>> +    global = VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(inv_desc->hi);
>>>>>> +    size = VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(inv_desc->hi);
>>>>>> +    addr = VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(inv_desc->hi);
>>>>>> +    sid = VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(inv_desc->lo);
>>>>>> +    if (global) {
>>>>>> +        QLIST_FOREACH(vtd_dev_as, &s->vtd_as_with_notifiers, next) {
>>>>>> +            if ((vtd_dev_as->pasid != PCI_NO_PASID) &&
>>>>>> +                (PCI_BUILD_BDF(pci_bus_num(vtd_dev_as->bus),
>>>>>> +                                           vtd_dev_as->devfn) == sid)) {
>>>>>> +                do_invalidate_device_tlb(vtd_dev_as, size, addr);
>>>>>> +            }
>>>>>> +        }
>>>>>> +    } else {
>>>>>> +        pasid = VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(inv_desc->lo);
>>>>>> +        vtd_dev_as = vtd_get_as_by_sid_and_pasid(s, sid, pasid);
>>>>>> +        if (!vtd_dev_as) {
>>>>>> +            return true;
>>>>>> +        }
>>>>>> +
>>>>>> +        do_invalidate_device_tlb(vtd_dev_as, size, addr);
>>>>> Question:
>>>>>
>>>>> I wonder if current vhost (which has a device IOTLB abstraction via
>>>>> virtio-pci) can work with this (PASID based IOTLB invalidation)
>>>> Currently, it depends on if caching-mode is on. If it's off, vhost works. E.g.:
>>>>
>>>> -device intel-iommu,caching-mode=off,dma-drain=on,device-iotlb=on,x-
>>> scalable-mode=on
>>>> -netdev tap,id=tap0,vhost=on,script=/etc/qemu-ifup
>>>> -device virtio-net-pci,netdev=tap0,bus=root0,iommu_platform=on,ats=on
>>>>
>>>> It doesn't work currently when caching-mode is on.
>>>> Reason is linux kernel has an optimization to send only piotlb invalidation,
>>>> no device-piotlb invalidation is sent. But I heard from Yi the optimization
>>>> will be dropped, then it will work too when caching-mode is on.
>>> Great, if possible please copy me when sending those fixes.
>> FYI, I just found the optimization had already been dropped since April 2024 by commit https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=304b3bde24b58515a75fd198beb52ca57df6275f
>>
>> After updating guest kernel to a new version containing above commit,
>> vhost works irrespective the value of caching-mode.
>>
>> Thanks
>> Zhenzhong
> Great. Thanks for the updating.

Good news,
Thanks Zhenzhong!

RE: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device IOTLB invalidation

Posted by Duan, Zhenzhong 1 year, 4 months ago


>-----Original Message-----
>From: Jason Wang <jasowang@redhat.com>
>Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based
>device IOTLB invalidation
>
>On Fri, Sep 27, 2024 at 3:18 PM Duan, Zhenzhong
><zhenzhong.duan@intel.com> wrote:
>>
>>
>>
>> >-----Original Message-----
>> >From: Jason Wang <jasowang@redhat.com>
>> >Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-
>based
>> >device IOTLB invalidation
>> >
>> >On Wed, Sep 11, 2024 at 1:27 PM Zhenzhong Duan
>> ><zhenzhong.duan@intel.com> wrote:
>> >>
>> >> From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
>> >>
>> >> Signed-off-by: Clément Mathieu--Drif <clement.mathieu--
>drif@eviden.com>
>> >> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>> >> ---
>> >>  hw/i386/intel_iommu_internal.h | 11 ++++++++
>> >>  hw/i386/intel_iommu.c          | 50
>> >++++++++++++++++++++++++++++++++++
>> >>  2 files changed, 61 insertions(+)
>> >>
>> >> diff --git a/hw/i386/intel_iommu_internal.h
>> >b/hw/i386/intel_iommu_internal.h
>> >> index 4f2c3a9350..52bdbf3bc5 100644
>> >> --- a/hw/i386/intel_iommu_internal.h
>> >> +++ b/hw/i386/intel_iommu_internal.h
>> >> @@ -375,6 +375,7 @@ typedef union VTDInvDesc VTDInvDesc;
>> >>  #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait
>Descriptor
>> >*/
>> >>  #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate
>Desc
>> >*/
>> >>  #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate
>Desc */
>> >> +#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB
>> >inv_desc*/
>> >>  #define VTD_INV_DESC_NONE               0   /* Not an Invalidate
>Descriptor
>> >*/
>> >>
>> >>  /* Masks for Invalidation Wait Descriptor*/
>> >> @@ -413,6 +414,16 @@ typedef union VTDInvDesc VTDInvDesc;
>> >>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
>> >>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
>> >>
>> >> +/* Mask for PASID Device IOTLB Invalidate Descriptor */
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(val) ((val) & \
>> >> +                                                   0xfffffffffffff000ULL)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(val) ((val >> 11) &
>0x1)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(val) ((val) &
>0x1)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(val) (((val) >> 16) &
>> >0xffffULL)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(val) ((val >> 32)
>&
>> >0xfffffULL)
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI 0x7feULL
>> >> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO
>> >0xfff000000000f000ULL
>> >> +
>> >>  /* 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 d28c862598..4cf56924e1 100644
>> >> --- a/hw/i386/intel_iommu.c
>> >> +++ b/hw/i386/intel_iommu.c
>> >> @@ -3017,6 +3017,49 @@ static void
>> >do_invalidate_device_tlb(VTDAddressSpace *vtd_dev_as,
>> >>      memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
>> >>  }
>> >>
>> >> +static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
>> >> +                                           VTDInvDesc *inv_desc)
>> >> +{
>> >> +    uint16_t sid;
>> >> +    VTDAddressSpace *vtd_dev_as;
>> >> +    bool size;
>> >> +    bool global;
>> >> +    hwaddr addr;
>> >> +    uint32_t pasid;
>> >> +
>> >> +    if ((inv_desc->hi & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI)
>||
>> >> +         (inv_desc->lo & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO))
>{
>> >> +        error_report_once("%s: invalid pasid-based dev iotlb inv desc:"
>> >> +                          "hi=%"PRIx64 "(reserved nonzero)",
>> >> +                          __func__, inv_desc->hi);
>> >> +        return false;
>> >> +    }
>> >> +
>> >> +    global = VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(inv_desc-
>>hi);
>> >> +    size = VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(inv_desc->hi);
>> >> +    addr = VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(inv_desc->hi);
>> >> +    sid = VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(inv_desc->lo);
>> >> +    if (global) {
>> >> +        QLIST_FOREACH(vtd_dev_as, &s->vtd_as_with_notifiers, next) {
>> >> +            if ((vtd_dev_as->pasid != PCI_NO_PASID) &&
>> >> +                (PCI_BUILD_BDF(pci_bus_num(vtd_dev_as->bus),
>> >> +                                           vtd_dev_as->devfn) == sid)) {
>> >> +                do_invalidate_device_tlb(vtd_dev_as, size, addr);
>> >> +            }
>> >> +        }
>> >> +    } else {
>> >> +        pasid = VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(inv_desc-
>>lo);
>> >> +        vtd_dev_as = vtd_get_as_by_sid_and_pasid(s, sid, pasid);
>> >> +        if (!vtd_dev_as) {
>> >> +            return true;
>> >> +        }
>> >> +
>> >> +        do_invalidate_device_tlb(vtd_dev_as, size, addr);
>> >
>> >Question:
>> >
>> >I wonder if current vhost (which has a device IOTLB abstraction via
>> >virtio-pci) can work with this (PASID based IOTLB invalidation)
>>
>> Currently, it depends on if caching-mode is on. If it's off, vhost works. E.g.:
>>
>> -device intel-iommu,caching-mode=off,dma-drain=on,device-iotlb=on,x-
>scalable-mode=on
>> -netdev tap,id=tap0,vhost=on,script=/etc/qemu-ifup
>> -device virtio-net-pci,netdev=tap0,bus=root0,iommu_platform=on,ats=on
>>
>> It doesn't work currently when caching-mode is on.
>> Reason is linux kernel has an optimization to send only piotlb invalidation,
>> no device-piotlb invalidation is sent. But I heard from Yi the optimization
>> will be dropped, then it will work too when caching-mode is on.
>
>Great, if possible please copy me when sending those fixes.

Sure, +Yi, Baolu for their attention.

Thanks
Zhenzhong

RE: [PATCH v3 12/17] intel_iommu: Add support for PASID-based device IOTLB invalidation

Posted by Duan, Zhenzhong 1 year, 4 months ago


>-----Original Message-----
>From: Duan, Zhenzhong
>Subject: RE: [PATCH v3 12/17] intel_iommu: Add support for PASID-based
>device IOTLB invalidation
>
>
>
>>-----Original Message-----
>>From: Jason Wang <jasowang@redhat.com>
>>Subject: Re: [PATCH v3 12/17] intel_iommu: Add support for PASID-based
>>device IOTLB invalidation
>>
>>On Wed, Sep 11, 2024 at 1:27 PM Zhenzhong Duan
>><zhenzhong.duan@intel.com> wrote:
>>>
>>> From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
>>>
>>> Signed-off-by: Clément Mathieu--Drif <clement.mathieu--
>drif@eviden.com>
>>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>>> ---
>>>  hw/i386/intel_iommu_internal.h | 11 ++++++++
>>>  hw/i386/intel_iommu.c          | 50
>>++++++++++++++++++++++++++++++++++
>>>  2 files changed, 61 insertions(+)
>>>
>>> diff --git a/hw/i386/intel_iommu_internal.h
>>b/hw/i386/intel_iommu_internal.h
>>> index 4f2c3a9350..52bdbf3bc5 100644
>>> --- a/hw/i386/intel_iommu_internal.h
>>> +++ b/hw/i386/intel_iommu_internal.h
>>> @@ -375,6 +375,7 @@ typedef union VTDInvDesc VTDInvDesc;
>>>  #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait
>Descriptor
>>*/
>>>  #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate
>Desc
>>*/
>>>  #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate Desc
>*/
>>> +#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB
>>inv_desc*/
>>>  #define VTD_INV_DESC_NONE               0   /* Not an Invalidate Descriptor
>>*/
>>>
>>>  /* Masks for Invalidation Wait Descriptor*/
>>> @@ -413,6 +414,16 @@ typedef union VTDInvDesc VTDInvDesc;
>>>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_HI 0xffeULL
>>>  #define VTD_INV_DESC_DEVICE_IOTLB_RSVD_LO 0xffff0000ffe0fff8
>>>
>>> +/* Mask for PASID Device IOTLB Invalidate Descriptor */
>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(val) ((val) & \
>>> +                                                   0xfffffffffffff000ULL)
>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(val) ((val >> 11) &
>0x1)
>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(val) ((val) & 0x1)
>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(val) (((val) >> 16) &
>>0xffffULL)
>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(val) ((val >> 32) &
>>0xfffffULL)
>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI 0x7feULL
>>> +#define VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO
>>0xfff000000000f000ULL
>>> +
>>>  /* 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 d28c862598..4cf56924e1 100644
>>> --- a/hw/i386/intel_iommu.c
>>> +++ b/hw/i386/intel_iommu.c
>>> @@ -3017,6 +3017,49 @@ static void
>>do_invalidate_device_tlb(VTDAddressSpace *vtd_dev_as,
>>>      memory_region_notify_iommu(&vtd_dev_as->iommu, 0, event);
>>>  }
>>>
>>> +static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
>>> +                                           VTDInvDesc *inv_desc)
>>> +{
>>> +    uint16_t sid;
>>> +    VTDAddressSpace *vtd_dev_as;
>>> +    bool size;
>>> +    bool global;
>>> +    hwaddr addr;
>>> +    uint32_t pasid;
>>> +
>>> +    if ((inv_desc->hi & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_HI) ||
>>> +         (inv_desc->lo & VTD_INV_DESC_PASID_DEVICE_IOTLB_RSVD_LO)) {
>>> +        error_report_once("%s: invalid pasid-based dev iotlb inv desc:"
>>> +                          "hi=%"PRIx64 "(reserved nonzero)",
>>> +                          __func__, inv_desc->hi);
>>> +        return false;
>>> +    }
>>> +
>>> +    global = VTD_INV_DESC_PASID_DEVICE_IOTLB_GLOBAL(inv_desc->hi);
>>> +    size = VTD_INV_DESC_PASID_DEVICE_IOTLB_SIZE(inv_desc->hi);
>>> +    addr = VTD_INV_DESC_PASID_DEVICE_IOTLB_ADDR(inv_desc->hi);
>>> +    sid = VTD_INV_DESC_PASID_DEVICE_IOTLB_SID(inv_desc->lo);
>>> +    if (global) {
>>> +        QLIST_FOREACH(vtd_dev_as, &s->vtd_as_with_notifiers, next) {
>>> +            if ((vtd_dev_as->pasid != PCI_NO_PASID) &&
>>> +                (PCI_BUILD_BDF(pci_bus_num(vtd_dev_as->bus),
>>> +                                           vtd_dev_as->devfn) == sid)) {
>>> +                do_invalidate_device_tlb(vtd_dev_as, size, addr);
>>> +            }
>>> +        }
>>> +    } else {
>>> +        pasid = VTD_INV_DESC_PASID_DEVICE_IOTLB_PASID(inv_desc->lo);
>>> +        vtd_dev_as = vtd_get_as_by_sid_and_pasid(s, sid, pasid);
>>> +        if (!vtd_dev_as) {
>>> +            return true;
>>> +        }
>>> +
>>> +        do_invalidate_device_tlb(vtd_dev_as, size, addr);
>>
>>Question:
>>
>>I wonder if current vhost (which has a device IOTLB abstraction via
>>virtio-pci) can work with this (PASID based IOTLB invalidation)
>
>Currently, it depends on if caching-mode is on. If it's off, vhost works. E.g.:
>
>-device intel-iommu,caching-mode=off,dma-drain=on,device-iotlb=on,x-
>scalable-mode=on
>-netdev tap,id=tap0,vhost=on,script=/etc/qemu-ifup
>-device virtio-net-pci,netdev=tap0,bus=root0,iommu_platform=on,ats=on

Sorry, typo error on scalable mode parameter, should be:

-device intel-iommu,caching-mode=off,dma-drain=on,device-iotlb=on,x-scalable-mode=modern
-netdev tap,id=tap0,vhost=on,script=/etc/qemu-ifup
-device virtio-net-pci,netdev=tap0,bus=root0,iommu_platform=on,ats=on

Thanks
Zhenzhong

>
>It doesn't work currently when caching-mode is on.
>Reason is linux kernel has an optimization to send only piotlb invalidation,
>no device-piotlb invalidation is sent. But I heard from Yi the optimization
>will be dropped, then it will work too when caching-mode is on.
>
>Thanks
>Zhenzhong