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From: David Hildenbrand <david@redhat.com>
To: Julien Grall <julien.grall@arm.com>,
	Juergen Gross <jgross@suse.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Matthew Wilcox <willy@infradead.org>
Cc: k.khlebnikov@samsung.com,
	Stefano Stabellini <sstabellini@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	"VMware, Inc." <pv-drivers@vmware.com>,
	osstest service owner <osstest-admin@xenproject.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	linux-mm@kvack.org, Julien Freche <jfreche@vmware.com>,
	Nadav Amit <namit@vmware.com>,
	xen-devel@lists.xenproject.org
Subject: Re: [Xen-devel] xen: Can't insert balloon page into VM userspace (WAS Re: [linux-linus bisection] complete test-arm64-arm64-xl-xsm)
Date: Thu, 14 Mar 2019 15:14:56 +0100	[thread overview]
Message-ID: <f02aa953-d5d1-4e78-160f-9bca1516379f@redhat.com> (raw)
In-Reply-To: <cb525882-b52f-c142-8a6a-e5cb491e05d0@arm.com>

On 14.03.19 15:12, Julien Grall wrote:
> Hi,
> 
> On 3/14/19 8:37 AM, Juergen Gross wrote:
>> On 12/03/2019 20:46, David Hildenbrand wrote:
>>> On 12.03.19 19:23, David Hildenbrand wrote:
>>>
>>> I guess something like this could do the trick if I understood it correctly:
>>>
>>> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
>>> index 39b229f9e256..d37dd5bb7a8f 100644
>>> --- a/drivers/xen/balloon.c
>>> +++ b/drivers/xen/balloon.c
>>> @@ -604,6 +604,7 @@ int alloc_xenballooned_pages(int nr_pages, struct
>>> page **pages)
>>>          while (pgno < nr_pages) {
>>>                  page = balloon_retrieve(true);
>>>                  if (page) {
>>> +                       __ClearPageOffline(page);
>>>                          pages[pgno++] = page;
>>>   #ifdef CONFIG_XEN_HAVE_PVMMU
>>>                          /*
>>> @@ -645,8 +646,10 @@ void free_xenballooned_pages(int nr_pages, struct
>>> page **pages)
>>>          mutex_lock(&balloon_mutex);
>>>
>>>          for (i = 0; i < nr_pages; i++) {
>>> -               if (pages[i])
>>> +               if (pages[i]) {
>>> +                       __SetPageOffline(pages[i]);
>>>                          balloon_append(pages[i]);
>>> +               }
>>>          }
>>>
>>>          balloon_stats.target_unpopulated -= nr_pages;
>>>
>>>
>>> At least this way, the pages allocated (and thus eventually mapped to
>>> user space) would not be marked, but the other ones would remain marked
>>> and could be excluded by makedumptool.
>>>
>>
>> I think this patch should do the trick. Julien, could you give it a
>> try? On x86 I can't reproduce your problem easily as dom0 is PV with
>> plenty of unpopulated pages for grant memory not suffering from
>> missing "offline" bit.
> 
> Sure. I managed to get the console working with the patch suggested by 
> David. Feel free to add my tested-by if when you resend it as is.
> 

Thanks, I will send as proper patch later!

Cheers!

> Cheers,
> 


-- 

Thanks,

David / dhildenb


  reply	other threads:[~2019-03-14 14:15 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <E1h3Uiq-0002L6-Ij@osstest.test-lab.xenproject.org>
     [not found] ` <80211e70-5f54-9421-8e8f-2a4fc758ce39@arm.com>
     [not found]   ` <46118631-61d4-adb6-6ffc-4e7c62ea3da9@arm.com>
2019-03-12 17:14     ` xen: Can't insert balloon page into VM userspace (WAS Re: [Xen-devel] [linux-linus bisection] complete test-arm64-arm64-xl-xsm) Matthew Wilcox
2019-03-12 17:18       ` David Hildenbrand
2019-03-12 17:24         ` [Xen-devel] xen: Can't insert balloon page into VM userspace (WAS " Andrew Cooper
2019-03-12 18:02           ` Boris Ostrovsky
2019-03-12 18:11             ` Andrew Cooper
2019-03-12 18:23             ` David Hildenbrand
2019-03-12 19:46               ` David Hildenbrand
2019-03-14  8:37                 ` Juergen Gross
2019-03-14 14:12                   ` Julien Grall
2019-03-14 14:14                     ` David Hildenbrand [this message]
2019-03-14 14:15                     ` Juergen Gross
2019-03-14 14:16                       ` David Hildenbrand
2019-03-12 17:39         ` xen: Can't insert balloon page into VM userspace (WAS Re: [Xen-devel] " Julien Grall
2019-03-12 17:49           ` David Hildenbrand
2019-03-12 17:23       ` David Hildenbrand
2019-03-12 17:25         ` Nadav Amit

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