From: zhukeqian <zhukeqian1@huawei.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<iommu@lists.linux-foundation.org>, <kvm@vger.kernel.org>,
<kvmarm@lists.cs.columbia.edu>, Cornelia Huck <cohuck@redhat.com>,
"Marc Zyngier" <maz@kernel.org>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Joerg Roedel <joro@8bytes.org>,
Catalin Marinas <catalin.marinas@arm.com>,
James Morse <james.morse@arm.com>,
"Suzuki K Poulose" <suzuki.poulose@arm.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Mark Brown <broonie@kernel.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Alexios Zavras <alexios.zavras@intel.com>,
<wanghaibin.wang@huawei.com>, <jiangkunkun@huawei.com>
Subject: Re: [PATCH 4/7] vfio: iommu_type1: Fix missing dirty page when promote pinned_scope
Date: Tue, 15 Dec 2020 17:37:11 +0800 [thread overview]
Message-ID: <d2073c05-b6c9-04b4-782c-b89680834633@huawei.com> (raw)
In-Reply-To: <20201214170459.50cb8729@omen.home>
Hi Alex,
On 2020/12/15 8:04, Alex Williamson wrote:
> On Thu, 10 Dec 2020 15:34:22 +0800
> Keqian Zhu <zhukeqian1@huawei.com> wrote:
>
>> When we pin or detach a group which is not dirty tracking capable,
>> we will try to promote pinned_scope of vfio_iommu.
>>
>> If we succeed to do so, vfio only report pinned_scope as dirty to
>> userspace next time, but these memory written before pin or detach
>> is missed.
>>
>> The solution is that we must populate all dma range as dirty before
>> promoting pinned_scope of vfio_iommu.
>
> Please don't bury fixes patches into a series with other optimizations
> and semantic changes. Send it separately.
>
OK, I will.
>>
>> Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
>> ---
>> drivers/vfio/vfio_iommu_type1.c | 18 ++++++++++++++++++
>> 1 file changed, 18 insertions(+)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index bd9a94590ebc..00684597b098 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -1633,6 +1633,20 @@ static struct vfio_group *vfio_iommu_find_iommu_group(struct vfio_iommu *iommu,
>> return group;
>> }
>>
>> +static void vfio_populate_bitmap_all(struct vfio_iommu *iommu)
>> +{
>> + struct rb_node *n;
>> + unsigned long pgshift = __ffs(iommu->pgsize_bitmap);
>> +
>> + for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
>> + struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
>> + unsigned long nbits = dma->size >> pgshift;
>> +
>> + if (dma->iommu_mapped)
>> + bitmap_set(dma->bitmap, 0, nbits);
>> + }
>> +}
>
>
> If we detach a group which results in only non-IOMMU backed mdevs,
> don't we also clear dma->iommu_mapped as part of vfio_unmap_unpin()
> such that this test is invalid? Thanks,
Good spot :-). The code will skip bitmap_set under this situation.
We should set the bitmap unconditionally when vfio_iommu is promoted,
as we must have IOMMU backed domain before promoting the vfio_iommu.
Besides, I think we should also mark dirty in vfio_remove_dma if dirty
tracking is active. Right?
Thanks,
Keqian
>
> Alex
>
>> +
>> static void promote_pinned_page_dirty_scope(struct vfio_iommu *iommu)
>> {
>> struct vfio_domain *domain;
>> @@ -1657,6 +1671,10 @@ static void promote_pinned_page_dirty_scope(struct vfio_iommu *iommu)
>> }
>>
>> iommu->pinned_page_dirty_scope = true;
>> +
>> + /* Set all bitmap to avoid missing dirty page */
>> + if (iommu->dirty_page_tracking)
>> + vfio_populate_bitmap_all(iommu);
>> }
>>
>> static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions,
>
> .
>
WARNING: multiple messages have this Message-ID (diff)
From: zhukeqian <zhukeqian1@huawei.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: jiangkunkun@huawei.com, Andrew Morton <akpm@linux-foundation.org>,
kvm@vger.kernel.org, Suzuki K Poulose <suzuki.poulose@arm.com>,
Marc Zyngier <maz@kernel.org>, Cornelia Huck <cohuck@redhat.com>,
linux-kernel@vger.kernel.org,
Sean Christopherson <sean.j.christopherson@intel.com>,
Alexios Zavras <alexios.zavras@intel.com>,
iommu@lists.linux-foundation.org, Mark Brown <broonie@kernel.org>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
wanghaibin.wang@huawei.com, Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH 4/7] vfio: iommu_type1: Fix missing dirty page when promote pinned_scope
Date: Tue, 15 Dec 2020 17:37:11 +0800 [thread overview]
Message-ID: <d2073c05-b6c9-04b4-782c-b89680834633@huawei.com> (raw)
In-Reply-To: <20201214170459.50cb8729@omen.home>
Hi Alex,
On 2020/12/15 8:04, Alex Williamson wrote:
> On Thu, 10 Dec 2020 15:34:22 +0800
> Keqian Zhu <zhukeqian1@huawei.com> wrote:
>
>> When we pin or detach a group which is not dirty tracking capable,
>> we will try to promote pinned_scope of vfio_iommu.
>>
>> If we succeed to do so, vfio only report pinned_scope as dirty to
>> userspace next time, but these memory written before pin or detach
>> is missed.
>>
>> The solution is that we must populate all dma range as dirty before
>> promoting pinned_scope of vfio_iommu.
>
> Please don't bury fixes patches into a series with other optimizations
> and semantic changes. Send it separately.
>
OK, I will.
>>
>> Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
>> ---
>> drivers/vfio/vfio_iommu_type1.c | 18 ++++++++++++++++++
>> 1 file changed, 18 insertions(+)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index bd9a94590ebc..00684597b098 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -1633,6 +1633,20 @@ static struct vfio_group *vfio_iommu_find_iommu_group(struct vfio_iommu *iommu,
>> return group;
>> }
>>
>> +static void vfio_populate_bitmap_all(struct vfio_iommu *iommu)
>> +{
>> + struct rb_node *n;
>> + unsigned long pgshift = __ffs(iommu->pgsize_bitmap);
>> +
>> + for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
>> + struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
>> + unsigned long nbits = dma->size >> pgshift;
>> +
>> + if (dma->iommu_mapped)
>> + bitmap_set(dma->bitmap, 0, nbits);
>> + }
>> +}
>
>
> If we detach a group which results in only non-IOMMU backed mdevs,
> don't we also clear dma->iommu_mapped as part of vfio_unmap_unpin()
> such that this test is invalid? Thanks,
Good spot :-). The code will skip bitmap_set under this situation.
We should set the bitmap unconditionally when vfio_iommu is promoted,
as we must have IOMMU backed domain before promoting the vfio_iommu.
Besides, I think we should also mark dirty in vfio_remove_dma if dirty
tracking is active. Right?
Thanks,
Keqian
>
> Alex
>
>> +
>> static void promote_pinned_page_dirty_scope(struct vfio_iommu *iommu)
>> {
>> struct vfio_domain *domain;
>> @@ -1657,6 +1671,10 @@ static void promote_pinned_page_dirty_scope(struct vfio_iommu *iommu)
>> }
>>
>> iommu->pinned_page_dirty_scope = true;
>> +
>> + /* Set all bitmap to avoid missing dirty page */
>> + if (iommu->dirty_page_tracking)
>> + vfio_populate_bitmap_all(iommu);
>> }
>>
>> static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions,
>
> .
>
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: zhukeqian <zhukeqian1@huawei.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
kvm@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
Joerg Roedel <joro@8bytes.org>, Cornelia Huck <cohuck@redhat.com>,
linux-kernel@vger.kernel.org,
Sean Christopherson <sean.j.christopherson@intel.com>,
Alexios Zavras <alexios.zavras@intel.com>,
iommu@lists.linux-foundation.org, Mark Brown <broonie@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH 4/7] vfio: iommu_type1: Fix missing dirty page when promote pinned_scope
Date: Tue, 15 Dec 2020 17:37:11 +0800 [thread overview]
Message-ID: <d2073c05-b6c9-04b4-782c-b89680834633@huawei.com> (raw)
In-Reply-To: <20201214170459.50cb8729@omen.home>
Hi Alex,
On 2020/12/15 8:04, Alex Williamson wrote:
> On Thu, 10 Dec 2020 15:34:22 +0800
> Keqian Zhu <zhukeqian1@huawei.com> wrote:
>
>> When we pin or detach a group which is not dirty tracking capable,
>> we will try to promote pinned_scope of vfio_iommu.
>>
>> If we succeed to do so, vfio only report pinned_scope as dirty to
>> userspace next time, but these memory written before pin or detach
>> is missed.
>>
>> The solution is that we must populate all dma range as dirty before
>> promoting pinned_scope of vfio_iommu.
>
> Please don't bury fixes patches into a series with other optimizations
> and semantic changes. Send it separately.
>
OK, I will.
>>
>> Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
>> ---
>> drivers/vfio/vfio_iommu_type1.c | 18 ++++++++++++++++++
>> 1 file changed, 18 insertions(+)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index bd9a94590ebc..00684597b098 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -1633,6 +1633,20 @@ static struct vfio_group *vfio_iommu_find_iommu_group(struct vfio_iommu *iommu,
>> return group;
>> }
>>
>> +static void vfio_populate_bitmap_all(struct vfio_iommu *iommu)
>> +{
>> + struct rb_node *n;
>> + unsigned long pgshift = __ffs(iommu->pgsize_bitmap);
>> +
>> + for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
>> + struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
>> + unsigned long nbits = dma->size >> pgshift;
>> +
>> + if (dma->iommu_mapped)
>> + bitmap_set(dma->bitmap, 0, nbits);
>> + }
>> +}
>
>
> If we detach a group which results in only non-IOMMU backed mdevs,
> don't we also clear dma->iommu_mapped as part of vfio_unmap_unpin()
> such that this test is invalid? Thanks,
Good spot :-). The code will skip bitmap_set under this situation.
We should set the bitmap unconditionally when vfio_iommu is promoted,
as we must have IOMMU backed domain before promoting the vfio_iommu.
Besides, I think we should also mark dirty in vfio_remove_dma if dirty
tracking is active. Right?
Thanks,
Keqian
>
> Alex
>
>> +
>> static void promote_pinned_page_dirty_scope(struct vfio_iommu *iommu)
>> {
>> struct vfio_domain *domain;
>> @@ -1657,6 +1671,10 @@ static void promote_pinned_page_dirty_scope(struct vfio_iommu *iommu)
>> }
>>
>> iommu->pinned_page_dirty_scope = true;
>> +
>> + /* Set all bitmap to avoid missing dirty page */
>> + if (iommu->dirty_page_tracking)
>> + vfio_populate_bitmap_all(iommu);
>> }
>>
>> static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions,
>
> .
>
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
WARNING: multiple messages have this Message-ID (diff)
From: zhukeqian <zhukeqian1@huawei.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: jiangkunkun@huawei.com, Andrew Morton <akpm@linux-foundation.org>,
kvm@vger.kernel.org, Suzuki K Poulose <suzuki.poulose@arm.com>,
Marc Zyngier <maz@kernel.org>, Joerg Roedel <joro@8bytes.org>,
Cornelia Huck <cohuck@redhat.com>,
linux-kernel@vger.kernel.org,
Sean Christopherson <sean.j.christopherson@intel.com>,
Alexios Zavras <alexios.zavras@intel.com>,
iommu@lists.linux-foundation.org, Mark Brown <broonie@kernel.org>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
wanghaibin.wang@huawei.com, Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org,
Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH 4/7] vfio: iommu_type1: Fix missing dirty page when promote pinned_scope
Date: Tue, 15 Dec 2020 17:37:11 +0800 [thread overview]
Message-ID: <d2073c05-b6c9-04b4-782c-b89680834633@huawei.com> (raw)
In-Reply-To: <20201214170459.50cb8729@omen.home>
Hi Alex,
On 2020/12/15 8:04, Alex Williamson wrote:
> On Thu, 10 Dec 2020 15:34:22 +0800
> Keqian Zhu <zhukeqian1@huawei.com> wrote:
>
>> When we pin or detach a group which is not dirty tracking capable,
>> we will try to promote pinned_scope of vfio_iommu.
>>
>> If we succeed to do so, vfio only report pinned_scope as dirty to
>> userspace next time, but these memory written before pin or detach
>> is missed.
>>
>> The solution is that we must populate all dma range as dirty before
>> promoting pinned_scope of vfio_iommu.
>
> Please don't bury fixes patches into a series with other optimizations
> and semantic changes. Send it separately.
>
OK, I will.
>>
>> Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
>> ---
>> drivers/vfio/vfio_iommu_type1.c | 18 ++++++++++++++++++
>> 1 file changed, 18 insertions(+)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index bd9a94590ebc..00684597b098 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -1633,6 +1633,20 @@ static struct vfio_group *vfio_iommu_find_iommu_group(struct vfio_iommu *iommu,
>> return group;
>> }
>>
>> +static void vfio_populate_bitmap_all(struct vfio_iommu *iommu)
>> +{
>> + struct rb_node *n;
>> + unsigned long pgshift = __ffs(iommu->pgsize_bitmap);
>> +
>> + for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
>> + struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node);
>> + unsigned long nbits = dma->size >> pgshift;
>> +
>> + if (dma->iommu_mapped)
>> + bitmap_set(dma->bitmap, 0, nbits);
>> + }
>> +}
>
>
> If we detach a group which results in only non-IOMMU backed mdevs,
> don't we also clear dma->iommu_mapped as part of vfio_unmap_unpin()
> such that this test is invalid? Thanks,
Good spot :-). The code will skip bitmap_set under this situation.
We should set the bitmap unconditionally when vfio_iommu is promoted,
as we must have IOMMU backed domain before promoting the vfio_iommu.
Besides, I think we should also mark dirty in vfio_remove_dma if dirty
tracking is active. Right?
Thanks,
Keqian
>
> Alex
>
>> +
>> static void promote_pinned_page_dirty_scope(struct vfio_iommu *iommu)
>> {
>> struct vfio_domain *domain;
>> @@ -1657,6 +1671,10 @@ static void promote_pinned_page_dirty_scope(struct vfio_iommu *iommu)
>> }
>>
>> iommu->pinned_page_dirty_scope = true;
>> +
>> + /* Set all bitmap to avoid missing dirty page */
>> + if (iommu->dirty_page_tracking)
>> + vfio_populate_bitmap_all(iommu);
>> }
>>
>> static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions,
>
> .
>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-12-15 9:38 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-10 7:34 [PATCH 0/7] vfio: iommu_type1: Some fixes and optimization Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` [PATCH 1/7] vfio: iommu_type1: Clear added dirty bit when unwind pin Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 19:16 ` Alex Williamson
2020-12-10 19:16 ` Alex Williamson
2020-12-10 19:16 ` Alex Williamson
2020-12-10 19:16 ` Alex Williamson
2020-12-11 6:51 ` zhukeqian
2020-12-11 6:51 ` zhukeqian
2020-12-11 6:51 ` zhukeqian
2020-12-11 6:51 ` zhukeqian
2020-12-15 0:16 ` Alex Williamson
2020-12-15 0:16 ` Alex Williamson
2020-12-15 0:16 ` Alex Williamson
2020-12-15 0:16 ` Alex Williamson
2020-12-16 7:22 ` [kbuild] " Dan Carpenter
2020-12-16 7:22 ` Dan Carpenter
2020-12-16 7:22 ` Dan Carpenter
2020-12-16 7:22 ` [kbuild] " Dan Carpenter
2020-12-16 7:22 ` Dan Carpenter
2020-12-16 7:22 ` Dan Carpenter
2020-12-10 7:34 ` [PATCH 2/7] vfio: iommu_type1: Initially set the pinned_page_dirty_scope Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` [PATCH 3/7] vfio: iommu_type1: Make an explicit "promote" semantic Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` [PATCH 4/7] vfio: iommu_type1: Fix missing dirty page when promote pinned_scope Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-15 0:04 ` Alex Williamson
2020-12-15 0:04 ` Alex Williamson
2020-12-15 0:04 ` Alex Williamson
2020-12-15 0:04 ` Alex Williamson
2020-12-15 9:37 ` zhukeqian [this message]
2020-12-15 9:37 ` zhukeqian
2020-12-15 9:37 ` zhukeqian
2020-12-15 9:37 ` zhukeqian
2020-12-15 15:53 ` Alex Williamson
2020-12-15 15:53 ` Alex Williamson
2020-12-15 15:53 ` Alex Williamson
2020-12-15 15:53 ` Alex Williamson
2020-12-18 8:21 ` Keqian Zhu
2020-12-18 8:21 ` Keqian Zhu
2020-12-18 8:21 ` Keqian Zhu
2020-12-18 8:21 ` Keqian Zhu
2020-12-10 7:34 ` [PATCH 5/7] vfio: iommu_type1: Drop parameter "pgsize" of vfio_dma_bitmap_alloc_all Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` [PATCH 6/7] vfio: iommu_type1: Drop parameter "pgsize" of vfio_iova_dirty_bitmap Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` [PATCH 7/7] vfio: iommu_type1: Drop parameter "pgsize" of update_user_bitmap Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
2020-12-10 7:34 ` Keqian Zhu
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