linux-kernel - Re: [PATCH v7 9/9] iommu/vt-d: Add iotlb flush for nested domain

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Message-ID: <54b6d7ed-c496-42d6-a4b2-50ba4c4b180c@intel.com>
Date: Tue, 26 Dec 2023 20:35:25 +0800
From: Yi Liu <yi.l.liu@...el.com>
To: "Tian, Kevin" <kevin.tian@...el.com>, "joro@...tes.org" <joro@...tes.org>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>, "jgg@...dia.com"
	<jgg@...dia.com>, "robin.murphy@....com" <robin.murphy@....com>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
CC: "cohuck@...hat.com" <cohuck@...hat.com>, "eric.auger@...hat.com"
	<eric.auger@...hat.com>, "nicolinc@...dia.com" <nicolinc@...dia.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, "mjrosato@...ux.ibm.com"
	<mjrosato@...ux.ibm.com>, "chao.p.peng@...ux.intel.com"
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	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>, "Duan,
 Zhenzhong" <zhenzhong.duan@...el.com>, "joao.m.martins@...cle.com"
	<joao.m.martins@...cle.com>, "Zeng, Xin" <xin.zeng@...el.com>, "Zhao, Yan Y"
	<yan.y.zhao@...el.com>, "j.granados@...sung.com" <j.granados@...sung.com>
Subject: Re: [PATCH v7 9/9] iommu/vt-d: Add iotlb flush for nested domain

On 2023/12/26 12:51, Yi Liu wrote:
> On 2023/12/22 14:57, Tian, Kevin wrote:
>>> From: Liu, Yi L <yi.l.liu@...el.com>
>>> Sent: Thursday, December 21, 2023 11:40 PM
>>>
>>> +
>>> +static void intel_nested_flush_cache(struct dmar_domain *domain, u64
>>> addr,
>>> +                     unsigned long npages, u32 *error)
>>> +{
>>> +    struct iommu_domain_info *info;
>>> +    unsigned long i;
>>> +    unsigned mask;
>>> +    u32 fault = 0;
>>> +
>>> +    if (npages == U64_MAX)
>>> +        mask = 64 - VTD_PAGE_SHIFT;
>>> +    else
>>> +        mask = ilog2(__roundup_pow_of_two(npages));
>>> +
>>> +    xa_for_each(&domain->iommu_array, i, info) {
>>> +        nested_flush_pasid_iotlb(info->iommu, domain, addr,
>>> npages, 0);
>>
>> so IOMMU_VTD_INV_FLAGS_LEAF is defined but ignored?
> 
> yeah... it is. It is named as ih in the driver code. But it appears only
> the below code is set ih. When calling iommu_flush_iotlb_psi(), the 5th
> parameter (ih) may be true.
> 
> static int intel_iommu_memory_notifier(struct notifier_block *nb,
>                         unsigned long val, void *v)
> {
>      struct memory_notify *mhp = v;
>      unsigned long start_vpfn = mm_to_dma_pfn(mhp->start_pfn);
>      unsigned long last_vpfn = mm_to_dma_pfn(mhp->start_pfn +
>              mhp->nr_pages - 1);
> 
>      switch (val) {
>      case MEM_GOING_ONLINE:
>          if (iommu_domain_identity_map(si_domain,
>                            start_vpfn, last_vpfn)) {
>              pr_warn("Failed to build identity map for [%lx-%lx]\n",
>                  start_vpfn, last_vpfn);
>              return NOTIFY_BAD;
>          }
>          break;
> 
>      case MEM_OFFLINE:
>      case MEM_CANCEL_ONLINE:
>          {
>              struct dmar_drhd_unit *drhd;
>              struct intel_iommu *iommu;
>              LIST_HEAD(freelist);
> 
>              domain_unmap(si_domain, start_vpfn, last_vpfn, &freelist);
> 
>              rcu_read_lock();
>              for_each_active_iommu(iommu, drhd)
>                  iommu_flush_iotlb_psi(iommu, si_domain,
>                      start_vpfn, mhp->nr_pages,
>                      list_empty(&freelist), 0);
>              rcu_read_unlock();
>              put_pages_list(&freelist);
>          }
>          break;
>      }
> 
>      return NOTIFY_OK;
> }

I passed this flag to the intel_nested_flush_cache() now as the
helper accepts an ih parameter.

-- 
Regards,
Yi Liu