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From: "Andy Lutomirski" <luto@kernel.org>
To: "David Hildenbrand" <david@redhat.com>,
	"Sean Christopherson" <seanjc@google.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>
Cc: "Vitaly Kuznetsov" <vkuznets@redhat.com>,
	"Wanpeng Li" <wanpengli@tencent.com>,
	"Jim Mattson" <jmattson@google.com>,
	"Joerg Roedel" <joro@8bytes.org>,
	"kvm list" <kvm@vger.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Borislav Petkov" <bp@alien8.de>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Joerg Roedel" <jroedel@suse.de>,
	"Andi Kleen" <ak@linux.intel.com>,
	"David Rientjes" <rientjes@google.com>,
	"Vlastimil Babka" <vbabka@suse.cz>,
	"Tom Lendacky" <thomas.lendacky@amd.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Varad Gautam" <varad.gautam@suse.com>,
	"Dario Faggioli" <dfaggioli@suse.com>,
	"the arch/x86 maintainers" <x86@kernel.org>,
	linux-mm@kvack.org, linux-coco@lists.linux.dev,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	"Sathyanarayanan Kuppuswamy" 
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	"Dave Hansen" <dave.hansen@intel.com>,
	"Yu Zhang" <yu.c.zhang@linux.intel.com>
Subject: Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory
Date: Fri, 27 Aug 2021 11:24:13 -0700	[thread overview]
Message-ID: <73319f3c-6f5e-4f39-a678-7be5fddd55f2@www.fastmail.com> (raw)
In-Reply-To: <cfe75e39-5927-c02a-b8bc-4de026bb7b3b@redhat.com>



On Thu, Aug 26, 2021, at 2:26 PM, David Hildenbrand wrote:
> On 26.08.21 19:05, Andy Lutomirski wrote:

> > Oof.  That's quite a requirement.  What's the point of the VMA once all
> > this is done?
> 
> You can keep using things like mbind(), madvise(), ... and the GUP code 
> with a special flag might mostly just do what you want. You won't have 
> to reinvent too many wheels on the page fault logic side at least.
> 

You can keep calling the functions.  The implementations working is a different story: you can't just unmap (pte_numa-style or otherwise) a private guest page to quiesce it, move it with memcpy(), and then fault it back in.

In any event, adding fd-based NUMA APIs would be quite nice.  Look at the numactl command.

  reply	other threads:[~2021-08-27 18:24 UTC|newest]

Thread overview: 142+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24  0:52 [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory Sean Christopherson
2021-08-24  0:52 ` Sean Christopherson
2021-08-24 10:48 ` Yu Zhang
2021-08-24 10:48   ` Yu Zhang
2021-08-26  0:35   ` Sean Christopherson
2021-08-26  0:35     ` Sean Christopherson
2021-08-26 13:23     ` Yu Zhang
2021-08-26 13:23       ` Yu Zhang
2021-08-26 10:15 ` David Hildenbrand
2021-08-26 10:15   ` David Hildenbrand
2021-08-26 17:05   ` Andy Lutomirski
2021-08-26 17:05     ` Andy Lutomirski
2021-08-26 21:26     ` David Hildenbrand
2021-08-26 21:26       ` David Hildenbrand
2021-08-27 18:24       ` Andy Lutomirski [this message]
2021-08-27 18:24         ` Andy Lutomirski
2021-08-27 22:28         ` Sean Christopherson
2021-08-27 22:28           ` Sean Christopherson
2021-08-31 19:12           ` David Hildenbrand
2021-08-31 19:12             ` David Hildenbrand
2021-08-31 20:45             ` Sean Christopherson
2021-08-31 20:45               ` Sean Christopherson
2021-09-01  7:51               ` David Hildenbrand
2021-09-01  7:51                 ` David Hildenbrand
2021-08-27  2:31   ` Yu Zhang
2021-08-27  2:31     ` Yu Zhang
2021-08-31 19:08     ` David Hildenbrand
2021-08-31 19:08       ` David Hildenbrand
2021-08-31 20:01       ` Andi Kleen
2021-08-31 20:01         ` Andi Kleen
2021-08-31 20:15         ` David Hildenbrand
2021-08-31 20:15           ` David Hildenbrand
2021-08-31 20:39           ` Andi Kleen
2021-08-31 20:39             ` Andi Kleen
2021-09-01  3:34             ` Yu Zhang
2021-09-01  3:34               ` Yu Zhang
2021-09-01  4:53     ` Andy Lutomirski
2021-09-01  4:53       ` Andy Lutomirski
2021-09-01  7:12       ` Tian, Kevin
2021-09-01  7:12         ` Tian, Kevin
2021-09-01 10:24       ` Yu Zhang
2021-09-01 10:24         ` Yu Zhang
2021-09-01 16:07         ` Andy Lutomirski
2021-09-01 16:07           ` Andy Lutomirski
2021-09-01 16:27           ` David Hildenbrand
2021-09-01 16:27             ` David Hildenbrand
2021-09-02  8:34             ` Yu Zhang
2021-09-02  8:34               ` Yu Zhang
2021-09-02  8:44               ` David Hildenbrand
2021-09-02  8:44                 ` David Hildenbrand
2021-09-02 11:02                 ` Yu Zhang
2021-09-02 11:02                   ` Yu Zhang
2021-09-02  8:19           ` Yu Zhang
2021-09-02  8:19             ` Yu Zhang
2021-09-02 18:41             ` Andy Lutomirski
2021-09-02 18:41               ` Andy Lutomirski
2021-09-07  1:33             ` Yan Zhao
2021-09-07  1:33               ` Yan Zhao
2021-09-02  9:27           ` Joerg Roedel
2021-09-02  9:27             ` Joerg Roedel
2021-09-02 18:41             ` Andy Lutomirski
2021-09-02 18:41               ` Andy Lutomirski
2021-09-02 18:57               ` Sean Christopherson
2021-09-02 18:57                 ` Sean Christopherson
2021-09-02 19:07                 ` Dave Hansen
2021-09-02 19:07                   ` Dave Hansen
2021-09-02 20:42                   ` Andy Lutomirski
2021-09-02 20:42                     ` Andy Lutomirski
2021-08-27 22:18   ` Sean Christopherson
2021-08-27 22:18     ` Sean Christopherson
2021-08-31 19:07     ` David Hildenbrand
2021-08-31 19:07       ` David Hildenbrand
2021-08-31 21:54       ` Sean Christopherson
2021-08-31 21:54         ` Sean Christopherson
2021-09-01  8:09         ` David Hildenbrand
2021-09-01  8:09           ` David Hildenbrand
2021-09-01 15:54           ` Andy Lutomirski
2021-09-01 15:54             ` Andy Lutomirski
2021-09-01 16:16             ` David Hildenbrand
2021-09-01 16:16               ` David Hildenbrand
2021-09-01 17:09               ` Andy Lutomirski
2021-09-01 17:09                 ` Andy Lutomirski
2021-09-01 16:18             ` James Bottomley
2021-09-01 16:18               ` James Bottomley
2021-09-01 16:22               ` David Hildenbrand
2021-09-01 16:22                 ` David Hildenbrand
2021-09-01 16:31                 ` James Bottomley
2021-09-01 16:31                   ` James Bottomley
2021-09-01 16:37                   ` David Hildenbrand
2021-09-01 16:37                     ` David Hildenbrand
2021-09-01 16:45                     ` James Bottomley
2021-09-01 16:45                       ` James Bottomley
2021-09-01 17:08                       ` David Hildenbrand
2021-09-01 17:08                         ` David Hildenbrand
2021-09-01 17:50                         ` Sean Christopherson
2021-09-01 17:50                           ` Sean Christopherson
2021-09-01 17:53                           ` David Hildenbrand
2021-09-01 17:53                             ` David Hildenbrand
2021-09-01 17:08               ` Andy Lutomirski
2021-09-01 17:08                 ` Andy Lutomirski
2021-09-01 17:13                 ` James Bottomley
2021-09-01 17:13                   ` James Bottomley
2021-09-02 10:18                 ` Joerg Roedel
2021-09-02 10:18                   ` Joerg Roedel
2021-09-01 18:24               ` Andy Lutomirski
2021-09-01 18:24                 ` Andy Lutomirski
2021-09-01 19:26               ` Dave Hansen
2021-09-01 19:26                 ` Dave Hansen
2021-09-07 15:00               ` Tom Lendacky
2021-09-07 15:00                 ` Tom Lendacky
2021-09-01  4:58       ` Andy Lutomirski
2021-09-01  4:58         ` Andy Lutomirski
2021-09-01  7:49         ` David Hildenbrand
2021-09-01  7:49           ` David Hildenbrand
2021-09-02 18:47 ` Kirill A. Shutemov
2021-09-02 18:47   ` Kirill A. Shutemov
2021-09-02 20:33   ` Sean Christopherson
2021-09-02 20:33     ` Sean Christopherson
2021-09-03 19:14     ` Kirill A. Shutemov
2021-09-03 19:14       ` Kirill A. Shutemov
2021-09-03 19:15       ` Andy Lutomirski
2021-09-03 19:15         ` Andy Lutomirski
2021-09-10 17:18         ` Kirill A. Shutemov
2021-09-10 17:18           ` Kirill A. Shutemov
2021-09-15 19:58           ` Chao Peng
2021-09-15 19:58             ` Chao Peng
2021-09-15 13:51             ` David Hildenbrand
2021-09-15 13:51               ` David Hildenbrand
2021-09-15 14:29               ` Kirill A. Shutemov
2021-09-15 14:29                 ` Kirill A. Shutemov
2021-09-15 14:59                 ` David Hildenbrand
2021-09-15 14:59                   ` David Hildenbrand
2021-09-15 15:35                   ` David Hildenbrand
2021-09-15 15:35                     ` David Hildenbrand
2021-09-15 20:04                   ` Kirill A. Shutemov
2021-09-15 20:04                     ` Kirill A. Shutemov
2021-09-15 14:11             ` Kirill A. Shutemov
2021-09-15 14:11               ` Kirill A. Shutemov
2021-09-16  7:36               ` Chao Peng
2021-09-16  7:36                 ` Chao Peng
2021-09-16  9:24               ` Paolo Bonzini
2021-09-16  9:24                 ` Paolo Bonzini

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