Hi Nadav,
On 3/27/21 12:36 PM, Nadav Amit wrote:
On Mar 26, 2021, at 7:31 PM, Lu Baolu wrote:
Hi Nadav,
On 3/19/21 12:46 AM, Nadav Amit wrote:
So here is my guess:
Intel probably used as a basis for the IOTLB an implementation of
some other (regular) TLB design.
Intel SDM says regarding
> On Mar 26, 2021, at 7:31 PM, Lu Baolu wrote:
>
> Hi Nadav,
>
> On 3/19/21 12:46 AM, Nadav Amit wrote:
>> So here is my guess:
>> Intel probably used as a basis for the IOTLB an implementation of
>> some other (regular) TLB design.
>> Intel SDM says regarding TLBs (4.10.4.2 “Recommended
Hi Nadav,
On 3/19/21 12:46 AM, Nadav Amit wrote:
So here is my guess:
Intel probably used as a basis for the IOTLB an implementation of
some other (regular) TLB design.
Intel SDM says regarding TLBs (4.10.4.2 “Recommended Invalidation”):
"Software wishing to prevent this uncertainty should
m...@redhat.com; Gonglei (Arei) ;
> w...@kernel.org; 'Lu Baolu' ; 'Joerg Roedel'
>
> Subject: RE: A problem of Intel IOMMU hardware ？
>
> Hi Nadav,
>
> > -Original Message-
> > From: Nadav Amit [mailto:nadav.a...@gmail.com]
> > Sent: Friday, March 19, 2021 1
nux-foundation.org; LKML ;
> alex.william...@redhat.com; Gonglei (Arei) ;
> w...@kernel.org
> Subject: Re: A problem of Intel IOMMU hardware ？
>
>
>
> > On Mar 18, 2021, at 2:25 AM, Longpeng (Mike, Cloud Infrastructure Service
> Product Dept.) wrote:
> >
>
Amit
Cc: chenjiashang ; David Woodhouse
; io...@lists.linux-foundation.org; LKML
; alex.william...@redhat.com; Gonglei
(Arei)
; w...@kernel.org
Subject: RE: A problem of Intel IOMMU hardware ？
From: iommu On Behalf Of
Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2. Consider
e, Cloud Infrastructure Service Product Dept.)
>> ; Nadav Amit
>> Cc: chenjiashang ; David Woodhouse
>> ; io...@lists.linux-foundation.org; LKML
>> ; alex.william...@redhat.com; Gonglei (Arei)
>> ; w...@kernel.org
>> Subject: RE: A problem of Intel IOMMU hardwar
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> ; alex.william...@redhat.com; Gonglei (Arei)
> ; w...@kernel.org
> Subject: RE: A problem of Intel IOMMU hardware ？
>
> > From: Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> >
> >
> > > -Original Message-
> > > From:
t Dept.)
> > ; Nadav Amit
> > Cc: chenjiashang ; David Woodhouse
> > ; io...@lists.linux-foundation.org; LKML
> > ; alex.william...@redhat.com; Gonglei
> (Arei)
> > ; w...@kernel.org
> > Subject: RE: A problem of Intel IOMMU hardware ？
> >
> > > Fr
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> ; alex.william...@redhat.com; Gonglei (Arei)
> ; w...@kernel.org
> Subject: RE: A problem of Intel IOMMU hardware ？
>
> > From: Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> >
> >
> >
> > > -Original Message-
> >
duct Dept.)
> > ; Nadav Amit
> > Cc: chenjiashang ; David Woodhouse
> > ; io...@lists.linux-foundation.org; LKML
> > ; alex.william...@redhat.com; Gonglei
> (Arei)
> > ; w...@kernel.org
> > Subject: RE: A problem of Intel IOMMU hardware ？
> >
> > >
-foundation.org; LKML
> ; alex.william...@redhat.com; Gonglei (Arei)
> ; w...@kernel.org
> Subject: RE: A problem of Intel IOMMU hardware ？
>
> > From: iommu On Behalf Of
> > Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> >
> > > 2. Consider ensu
> From: iommu On Behalf Of
> Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
>
> > 2. Consider ensuring that the problem is not somehow related to queued
> > invalidations. Try to use __iommu_flush_iotlb() instead of qi_flush_iotlb().
> >
>
> I tried to force to use
ex.william...@redhat.com; chenjiashang ;
> io...@lists.linux-foundation.org; Gonglei (Arei) ;
> LKML
> Subject: Re: A problem of Intel IOMMU hardware ？
>
>
>
> > On Mar 17, 2021, at 2:35 AM, Longpeng (Mike, Cloud Infrastructure Service
> Product Dept.) wrot
> On Mar 17, 2021, at 9:46 PM, Longpeng (Mike, Cloud Infrastructure Service
> Product Dept.) wrote:
>
[Snip]
>
> NOTE, the magical thing happen...(*Operation-4*) we write the PTE
> of Operation-1 from 0 to 0x3 which means can Read/Write, and then
> we trigger DMA read again, it success and
gt; Product
> Dept.) ; dw...@infradead.org; j...@8bytes.org;
> w...@kernel.org; io...@lists.linux-foundation.org; LKML
> ; Gonglei (Arei) ;
> chenjiashang
> Subject: Re: A problem of Intel IOMMU hardware ？
>
> Hi Alex,
>
> On 3/17/21 11:18 PM, Alex Williamson w
Hi Nadav,
On 3/18/21 2:12 AM, Nadav Amit wrote:
On Mar 17, 2021, at 2:35 AM, Longpeng (Mike, Cloud Infrastructure Service Product
Dept.) wrote:
Hi Nadav,
-Original Message-
From: Nadav Amit [mailto:nadav.a...@gmail.com]
reproduce the problem with high probability (~50%).
I
Hi Alex,
On 3/17/21 11:18 PM, Alex Williamson wrote:
{MAP, 0x0, 0xc000}, - (b)
use GDB to pause at here, and then DMA read IOVA=0,
IOVA 0 seems to be a special one. Have you verified with other addresses
than IOVA 0?
It is???
> On Mar 17, 2021, at 2:35 AM, Longpeng (Mike, Cloud Infrastructure Service
> Product Dept.) wrote:
>
> Hi Nadav,
>
>> -Original Message-
>> From: Nadav Amit [mailto:nadav.a...@gmail.com]
>>> reproduce the problem with high probability (~50%).
>>
>> I saw Lu replied, and he is much
On Wed, 17 Mar 2021 13:16:58 +0800
Lu Baolu wrote:
> Hi Longpeng,
>
> On 3/17/21 11:16 AM, Longpeng (Mike, Cloud Infrastructure Service
> Product Dept.) wrote:
> > Hi guys,
> >
> > We find the Intel iommu cache (i.e. iotlb) maybe works wrong in a special
> > situation, it would cause DMA
at.com
> Cc: baolu...@linux.intel.com; io...@lists.linux-foundation.org; LKML
> ; Gonglei (Arei) ;
> chenjiashang
> Subject: Re: A problem of Intel IOMMU hardware ？
>
> Hi Longpeng,
>
> On 3/17/21 11:16 AM, Longpeng (Mike, Cloud Infrastructure Service Product
>
ex.william...@redhat.com; chenjiashang ;
> io...@lists.linux-foundation.org; Gonglei (Arei) ;
> LKML
> Subject: Re: A problem of Intel IOMMU hardware ？
>
>
>
> > On Mar 16, 2021, at 8:16 PM, Longpeng (Mike, Cloud Infrastructure Service
> Product Dept.) wrote:
> >
> On Mar 16, 2021, at 8:16 PM, Longpeng (Mike, Cloud Infrastructure Service
> Product Dept.) wrote:
>
> Hi guys,
>
> We find the Intel iommu cache (i.e. iotlb) maybe works wrong in a special
> situation, it would cause DMA fails or get wrong data.
>
> The reproducer (based on Alex's vfio
Hi Longpeng,
On 3/17/21 11:16 AM, Longpeng (Mike, Cloud Infrastructure Service
Product Dept.) wrote:
Hi guys,
We find the Intel iommu cache (i.e. iotlb) maybe works wrong in a special
situation, it would cause DMA fails or get wrong data.
The reproducer (based on Alex's vfio testsuite[1]) is
Hi guys,
We find the Intel iommu cache (i.e. iotlb) maybe works wrong in a special
situation, it would cause DMA fails or get wrong data.
The reproducer (based on Alex's vfio testsuite[1]) is in attachment, it can
reproduce the problem with high probability (~50%).
The machine we used is:
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