From: Ralph Campbell <rcampbell@nvidia.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: amd-gfx@lists.freedesktop.org, nouveau@lists.freedesktop.org,
dri-devel@lists.freedesktop.org, kvm-ppc@vger.kernel.org,
"Christoph Hellwig" <hch@lst.de>,
linux-mm@kvack.org, "Jerome Glisse" <jglisse@redhat.com>,
"Ben Skeggs" <bskeggs@redhat.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Bharata B Rao" <bharata@linux.ibm.com>,
"Christian König" <christian.koenig@amd.com>
Subject: Re: [PATCH 3/4] mm: simplify device private page handling in hmm_range_fault
Date: Thu, 19 Mar 2020 18:33:04 -0700 [thread overview]
Message-ID: <8d549ef6-14ae-7055-58c8-d56de8bf4ba6@nvidia.com> (raw)
In-Reply-To: <20200320001428.GA9199@ziepe.ca>
On 3/19/20 5:14 PM, Jason Gunthorpe wrote:
> On Tue, Mar 17, 2020 at 04:14:31PM -0700, Ralph Campbell wrote:
>
>> +static int dmirror_fault(struct dmirror *dmirror, unsigned long start,
>> + unsigned long end, bool write)
>> +{
>> + struct mm_struct *mm = dmirror->mm;
>> + unsigned long addr;
>> + uint64_t pfns[64];
>> + struct hmm_range range = {
>> + .notifier = &dmirror->notifier,
>> + .pfns = pfns,
>> + .flags = dmirror_hmm_flags,
>> + .values = dmirror_hmm_values,
>> + .pfn_shift = DPT_SHIFT,
>> + .pfn_flags_mask = ~(dmirror_hmm_flags[HMM_PFN_VALID] |
>> + dmirror_hmm_flags[HMM_PFN_WRITE]),
>
> Since pfns is not initialized pfn_flags_mask should be 0.
Good point.
>> + .default_flags = dmirror_hmm_flags[HMM_PFN_VALID] |
>> + (write ? dmirror_hmm_flags[HMM_PFN_WRITE] : 0),
>> + .dev_private_owner = dmirror->mdevice,
>> + };
>> + int ret = 0;
>
>> +static int dmirror_snapshot(struct dmirror *dmirror,
>> + struct hmm_dmirror_cmd *cmd)
>> +{
>> + struct mm_struct *mm = dmirror->mm;
>> + unsigned long start, end;
>> + unsigned long size = cmd->npages << PAGE_SHIFT;
>> + unsigned long addr;
>> + unsigned long next;
>> + uint64_t pfns[64];
>> + unsigned char perm[64];
>> + char __user *uptr;
>> + struct hmm_range range = {
>> + .pfns = pfns,
>> + .flags = dmirror_hmm_flags,
>> + .values = dmirror_hmm_values,
>> + .pfn_shift = DPT_SHIFT,
>> + .pfn_flags_mask = ~0ULL,
>
> Same here, especially since this is snapshot
>
> Jason
Actually, snapshot ignores pfn_flags_mask and default_flags.
In hmm_pte_need_fault(), HMM_FAULT_SNAPSHOT is checked and returns early before
checking pfn_flags_mask and default_flags since no faults are being requested.
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next prev parent reply other threads:[~2020-03-20 1:33 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-16 19:32 ensure device private pages have an owner v2 Christoph Hellwig
2020-03-16 19:32 ` [PATCH 1/4] memremap: add an owner field to struct dev_pagemap Christoph Hellwig
2020-03-16 20:55 ` Ralph Campbell
2020-03-16 19:32 ` [PATCH 2/4] mm: handle multiple owners of device private pages in migrate_vma Christoph Hellwig
2020-03-16 21:43 ` Ralph Campbell
2020-03-16 19:32 ` [PATCH 3/4] mm: simplify device private page handling in hmm_range_fault Christoph Hellwig
2020-03-16 19:59 ` Jason Gunthorpe
2020-03-16 21:33 ` Christoph Hellwig
2020-03-16 22:49 ` Ralph Campbell
2020-03-17 7:34 ` Christoph Hellwig
2020-03-17 22:43 ` Ralph Campbell
2020-03-18 9:34 ` Christoph Hellwig
2020-03-17 12:15 ` Jason Gunthorpe
2020-03-17 12:24 ` Christoph Hellwig
2020-03-17 12:28 ` Christoph Hellwig
2020-03-17 12:47 ` Jason Gunthorpe
2020-03-17 12:59 ` Christoph Hellwig
2020-03-17 17:32 ` Jason Gunthorpe
2020-03-17 23:14 ` Ralph Campbell
2020-03-19 18:17 ` Jason Gunthorpe
2020-03-19 22:56 ` Ralph Campbell
2020-03-20 0:03 ` Jason Gunthorpe
2020-03-21 8:20 ` Christoph Hellwig
2020-03-20 0:14 ` Jason Gunthorpe
2020-03-20 1:33 ` Ralph Campbell [this message]
2020-03-20 12:58 ` Jason Gunthorpe
2020-03-16 19:32 ` [PATCH 4/4] mm: check the device private page owner " Christoph Hellwig
2020-03-16 19:49 ` Jason Gunthorpe
2020-03-16 23:11 ` Ralph Campbell
2020-03-20 13:41 ` Jason Gunthorpe
2020-03-21 8:22 ` Christoph Hellwig
2020-03-21 12:38 ` Jason Gunthorpe
2020-03-21 15:18 ` Christoph Hellwig
2020-03-17 5:31 ` ensure device private pages have an owner v2 Bharata B Rao
2020-03-19 0:28 ` Jason Gunthorpe
2020-03-19 7:16 ` Christoph Hellwig
2020-03-19 11:50 ` Jason Gunthorpe
2020-03-19 18:50 ` Jason Gunthorpe
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