From: Paolo Bonzini <pbonzini@redhat.com>
To: Jerome Glisse <jglisse@redhat.com>,
Mircea CIRJALIU - MELIU <mcirjaliu@bitdefender.com>
Cc: "Adalbert Lazăr" <alazar@bitdefender.com>,
"Matthew Wilcox" <willy@infradead.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
"Tamas K Lengyel" <tamas@tklengyel.com>,
"Mathieu Tarral" <mathieu.tarral@protonmail.com>,
"Samuel Laurén" <samuel.lauren@iki.fi>,
"Patrick Colp" <patrick.colp@oracle.com>,
"Jan Kiszka" <jan.kiszka@siemens.com>,
"Stefan Hajnoczi" <stefanha@redhat.com>,
"Weijiang Yang" <weijiang.yang@intel.com>,
"Yu C" <yu.c.zhang@intel.com>,
"Mihai Donțu" <mdontu@bitdefender.com>
Subject: Re: DANGER WILL ROBINSON, DANGER
Date: Wed, 2 Oct 2019 15:46:30 +0200 [thread overview]
Message-ID: <ab461f02-e6cd-de0f-b6ce-0f5a95798eaa@redhat.com> (raw)
In-Reply-To: <20191002192714.GA5020@redhat.com>
On 02/10/19 21:27, Jerome Glisse wrote:
> On Tue, Sep 10, 2019 at 07:49:51AM +0000, Mircea CIRJALIU - MELIU wrote:
>>> On 05/09/19 20:09, Jerome Glisse wrote:
>>>> Not sure i understand, you are saying that the solution i outline
>>>> above does not work ? If so then i think you are wrong, in the above
>>>> solution the importing process mmap a device file and the resulting
>>>> vma is then populated using insert_pfn() and constantly keep
>>>> synchronize with the target process through mirroring which means that
>>>> you never have to look at the struct page ... you can mirror any kind
>>>> of memory from the remote process.
>>>
>>> If insert_pfn in turn calls MMU notifiers for the target VMA (which would be
>>> the KVM MMU notifier), then that would work. Though I guess it would be
>>> possible to call MMU notifier update callbacks around the call to insert_pfn.
>>
>> Can't do that.
>> First, insert_pfn() uses set_pte_at() which won't trigger the MMU notifier on
>> the target VMA. It's also static, so I'll have to access it thru vmf_insert_pfn()
>> or vmf_insert_mixed().
>
> Why would you need to target mmu notifier on target vma ?
If the mapping of the source VMA changes, mirroring can update the
target VMA via insert_pfn. But what ensures that KVM's MMU notifier
dismantles its own existing page tables (so that they can be recreated
with the new mapping from the source VMA)?
Thanks,
Paolo
> You do not need
> that. The workflow is:
>
> userspace:
> ptr = mmap(/dev/kvm-mirroring-device, virtual_addresse_of_target)
>
> Then when the mirroring process access ptr it triggers page fault that
> endup in the vm_operation_struct->fault() which is just doing:
>
> kernel-kvm-mirroring-function:
> kvm_mirror_page_fault(struct vm_fault *vmf) {
> struct kvm_mirror_struct *kvmms;
>
> kvmms = kvm_mirror_struct_from_file(vmf->vma->vm_file);
> ...
> again:
> hmm_range_register(&range);
> hmm_range_snapshot(&range);
> take_lock(kvmms->update);
> if (!hmm_range_valid(&range)) {
> vm_insert_pfn();
> drop_lock(kvmms->update);
> hmm_range_unregister(&range);
> return VM_FAULT_NOPAGE;
> }
> drop_lock(kvmms->update);
> goto again;
> }
>
> The notifier callback:
> kvmms_notifier_start() {
> take_lock(kvmms->update);
> clear_pte(start, end);
> drop_lock(kvmms->update);
> }
>
>>
>> Our model (the importing process is encapsulated in another VM) forces us
>> to mirror certain pages from the anon VMA backing one VM's system RAM to
>> the other VM's anon VMA.
>
> The mirror does not have to be an anon vma it can very well be a
> device vma ie mmap of a device file. I do not see any reasons why
> the mirror need to be an anon vma. Please explain why.
>
>>
>> Using the functions above means setting VM_PFNMAP|VM_MIXEDMAP on
>> the target anon VMA, but I guess this breaks the VMA. Is this recommended?
>
> The mirror vma should not be an anon vma.
>
>>
>> Then, mapping anon pages from one VMA to another without fixing the
>> refcount and the mapcount breaks the daemons that think they're working
>> on a pure anon VMA (kcompactd, khugepaged).
>
> Note here the target vma ie the mirroring one is a mmap of device file
> and thus is skip by all of the above (kcompactd, khugepaged, ...) it is
> fully ignore by core mm.
>
> Thus you do not need to fix the refcount in any way. If any of the core
> mm try to reclaim memory from the original vma then you will get mmu
> notifier callbacks and all you have to do is clear the page table of your
> device vma.
>
> I did exactly that as a tools in the past and it works just fine with
> no change to core mm whatsoever.
>
> Cheers,
> Jérôme
>
next prev parent reply other threads:[~2019-10-02 13:46 UTC|newest]
Thread overview: 168+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-09 15:59 [RFC PATCH v6 00/92] VM introspection Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 01/92] kvm: introduce KVMI (VM introspection subsystem) Adalbert Lazăr
2019-08-12 20:20 ` Sean Christopherson
2019-08-13 9:11 ` Paolo Bonzini
2019-08-13 11:57 ` Adalbert Lazăr
[not found] ` <5d52a5ae.1c69fb81.5c260.1573SMTPIN_ADDED_BROKEN@mx.google.com>
2019-08-13 12:09 ` Paolo Bonzini
2019-08-13 15:01 ` Sean Christopherson
2019-08-13 21:03 ` Paolo Bonzini
2019-08-14 9:48 ` Adalbert Lazăr
[not found] ` <5d53d8d1.1c69fb81.7d32.0bedSMTPIN_ADDED_BROKEN@mx.google.com>
2019-08-14 10:37 ` Paolo Bonzini
2019-08-09 15:59 ` [RFC PATCH v6 02/92] kvm: introspection: add basic ioctls (hook/unhook) Adalbert Lazăr
2019-08-13 8:44 ` Paolo Bonzini
2019-08-13 14:24 ` Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 03/92] kvm: introspection: add permission access ioctls Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 04/92] kvm: introspection: add the read/dispatch message function Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 05/92] kvm: introspection: add KVMI_GET_VERSION Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 06/92] kvm: introspection: add KVMI_CONTROL_CMD_RESPONSE Adalbert Lazăr
2019-08-13 9:15 ` Paolo Bonzini
2019-08-13 17:08 ` Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 07/92] kvm: introspection: honor the reply option when handling the KVMI_GET_VERSION command Adalbert Lazăr
2019-08-13 9:16 ` Paolo Bonzini
2019-08-09 15:59 ` [RFC PATCH v6 08/92] kvm: introspection: add KVMI_CHECK_COMMAND and KVMI_CHECK_EVENT Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 09/92] kvm: introspection: add KVMI_GET_GUEST_INFO Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 10/92] kvm: introspection: add KVMI_CONTROL_VM_EVENTS Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 11/92] kvm: introspection: add vCPU related data Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 12/92] kvm: introspection: add a jobs list to every introspected vCPU Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 13/92] kvm: introspection: make the vCPU wait even when its jobs list is empty Adalbert Lazăr
2019-08-13 8:43 ` Paolo Bonzini
2019-08-13 14:19 ` Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 14/92] kvm: introspection: handle introspection commands before returning to guest Adalbert Lazăr
2019-08-13 8:26 ` Paolo Bonzini
2019-08-13 13:54 ` Adalbert Lazăr
[not found] ` <5d52c10e.1c69fb81.26904.fd34SMTPIN_ADDED_BROKEN@mx.google.com>
2019-08-13 14:45 ` Paolo Bonzini
2019-08-14 9:39 ` Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 15/92] kvm: introspection: handle vCPU related introspection commands Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 16/92] kvm: introspection: handle events and event replies Adalbert Lazăr
2019-08-13 8:55 ` Paolo Bonzini
2019-08-13 15:25 ` Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 17/92] kvm: introspection: introduce event actions Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 18/92] kvm: introspection: add KVMI_EVENT_UNHOOK Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 19/92] kvm: introspection: add KVMI_EVENT_CREATE_VCPU Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 20/92] kvm: introspection: add KVMI_GET_VCPU_INFO Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 21/92] kvm: page track: add track_create_slot() callback Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 22/92] kvm: x86: provide all page tracking hooks with the guest virtual address Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 23/92] kvm: page track: add support for preread, prewrite and preexec Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 24/92] kvm: x86: wire in the preread/prewrite/preexec page trackers Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 25/92] kvm: x86: intercept the write access on sidt and other emulated instructions Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 26/92] kvm: x86: add kvm_mmu_nested_pagefault() Adalbert Lazăr
2019-08-13 8:12 ` Paolo Bonzini
2019-08-09 15:59 ` [RFC PATCH v6 27/92] kvm: introspection: use page track Adalbert Lazăr
2019-08-13 9:06 ` Paolo Bonzini
2019-08-09 15:59 ` [RFC PATCH v6 28/92] kvm: x86: consult the page tracking from kvm_mmu_get_page() and __direct_map() Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 29/92] kvm: introspection: add KVMI_CONTROL_EVENTS Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 30/92] kvm: x86: add kvm_spt_fault() Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 31/92] kvm: introspection: add KVMI_EVENT_PF Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 32/92] kvm: introspection: add KVMI_GET_PAGE_ACCESS Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 33/92] kvm: introspection: add KVMI_SET_PAGE_ACCESS Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 34/92] Documentation: Introduce EPT based Subpage Protection Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 35/92] KVM: VMX: Add control flags for SPP enabling Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 36/92] KVM: VMX: Implement functions for SPPT paging setup Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 37/92] KVM: VMX: Introduce SPP access bitmap and operation functions Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 38/92] KVM: VMX: Add init/set/get functions for SPP Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 39/92] KVM: VMX: Introduce SPP user-space IOCTLs Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 40/92] KVM: VMX: Handle SPP induced vmexit and page fault Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 41/92] KVM: MMU: Enable Lazy mode SPPT setup Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 42/92] KVM: MMU: Handle host memory remapping and reclaim Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 43/92] kvm: introspection: add KVMI_CONTROL_SPP Adalbert Lazăr
2019-08-09 15:59 ` [RFC PATCH v6 44/92] kvm: introspection: extend the internal database of tracked pages with write_bitmap info Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 45/92] kvm: introspection: add KVMI_GET_PAGE_WRITE_BITMAP Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 46/92] kvm: introspection: add KVMI_SET_PAGE_WRITE_BITMAP Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 47/92] kvm: introspection: add KVMI_READ_PHYSICAL and KVMI_WRITE_PHYSICAL Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 48/92] kvm: add kvm_vcpu_kick_and_wait() Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 49/92] kvm: introspection: add KVMI_PAUSE_VCPU and KVMI_EVENT_PAUSE_VCPU Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 50/92] kvm: introspection: add KVMI_GET_REGISTERS Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 51/92] kvm: introspection: add KVMI_SET_REGISTERS Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 52/92] kvm: introspection: add KVMI_GET_CPUID Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 53/92] kvm: introspection: add KVMI_INJECT_EXCEPTION + KVMI_EVENT_TRAP Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 54/92] kvm: introspection: add KVMI_CONTROL_CR and KVMI_EVENT_CR Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 55/92] kvm: introspection: add KVMI_CONTROL_MSR and KVMI_EVENT_MSR Adalbert Lazăr
2019-08-12 21:05 ` Sean Christopherson
2019-08-15 6:36 ` Nicusor CITU
2019-08-19 18:36 ` Sean Christopherson
2019-08-20 8:44 ` Nicusor CITU
2019-08-20 11:43 ` Mihai Donțu
2019-08-21 15:18 ` Sean Christopherson
2019-08-19 18:52 ` Sean Christopherson
2019-08-09 16:00 ` [RFC PATCH v6 56/92] kvm: x86: block any attempt to disable MSR interception if tracked by introspection Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 57/92] kvm: introspection: add KVMI_GET_XSAVE Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 58/92] kvm: introspection: add KVMI_GET_MTRR_TYPE Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 59/92] kvm: introspection: add KVMI_EVENT_XSETBV Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 60/92] kvm: x86: add kvm_arch_vcpu_set_guest_debug() Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 61/92] kvm: introspection: add KVMI_EVENT_BREAKPOINT Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 62/92] kvm: introspection: add KVMI_EVENT_HYPERCALL Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 63/92] kvm: introspection: add KVMI_EVENT_DESCRIPTOR Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 64/92] kvm: introspection: add single-stepping Adalbert Lazăr
2019-08-12 20:50 ` Sean Christopherson
2019-08-13 12:51 ` Adalbert Lazăr
2019-08-14 12:36 ` Nicusor CITU
2019-08-14 12:53 ` Paolo Bonzini
2019-08-09 16:00 ` [RFC PATCH v6 65/92] kvm: introspection: add KVMI_EVENT_SINGLESTEP Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 66/92] kvm: introspection: add custom input when single-stepping a vCPU Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 67/92] kvm: introspection: use single stepping on unimplemented instructions Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 68/92] kvm: x86: emulate a guest page table walk on SPT violations due to A/D bit updates Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 69/92] kvm: x86: keep the page protected if tracked by the introspection tool Adalbert Lazăr
2019-09-10 14:26 ` Konrad Rzeszutek Wilk
2019-09-10 16:28 ` Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 70/92] kvm: x86: filter out access rights only when " Adalbert Lazăr
2019-08-13 9:08 ` Paolo Bonzini
2019-08-13 16:06 ` Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 71/92] mm: add support for remote mapping Adalbert Lazăr
2019-08-09 16:24 ` DANGER WILL ROBINSON, DANGER Matthew Wilcox
2019-08-13 9:29 ` Paolo Bonzini
2019-08-13 11:24 ` Matthew Wilcox
2019-08-13 12:02 ` Paolo Bonzini
2019-08-13 11:01 ` Adalbert Lazăr
2019-08-15 19:19 ` Jerome Glisse
2019-08-15 20:16 ` Jerome Glisse
2019-08-16 17:45 ` Jason Gunthorpe
2019-08-23 12:39 ` Mircea CIRJALIU - MELIU
2019-09-05 18:09 ` Jerome Glisse
2019-09-09 17:00 ` Paolo Bonzini
2019-09-10 7:49 ` Mircea CIRJALIU - MELIU
2019-10-02 19:27 ` Jerome Glisse
2019-10-02 13:46 ` Paolo Bonzini [this message]
2019-10-02 14:15 ` Jerome Glisse
2019-10-02 16:18 ` Paolo Bonzini
2019-10-02 17:04 ` Jerome Glisse
2019-10-02 20:10 ` Paolo Bonzini
2019-10-03 15:42 ` Jerome Glisse
2019-10-03 15:50 ` Paolo Bonzini
2019-10-03 16:42 ` Mircea CIRJALIU - MELIU
2019-10-03 18:31 ` Jerome Glisse
2019-10-03 19:38 ` Paolo Bonzini
2019-10-04 9:41 ` Mircea CIRJALIU - MELIU
2019-10-04 11:46 ` Paolo Bonzini
2019-10-03 16:36 ` Mircea CIRJALIU - MELIU
2019-08-09 16:00 ` [RFC PATCH v6 72/92] kvm: introspection: add memory map/unmap support on the guest side Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 73/92] kvm: introspection: use remote mapping Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 74/92] kvm: x86: do not unconditionally patch the hypercall instruction during emulation Adalbert Lazăr
2019-08-13 9:20 ` Paolo Bonzini
2019-08-14 12:07 ` Adalbert Lazăr
[not found] ` <5d53f965.1c69fb81.cd952.035bSMTPIN_ADDED_BROKEN@mx.google.com>
2019-08-14 12:33 ` Paolo Bonzini
2019-08-09 16:00 ` [RFC PATCH v6 75/92] kvm: x86: disable gpa_available optimization in emulator_read_write_onepage() Adalbert Lazăr
2019-08-13 8:47 ` Paolo Bonzini
2019-08-13 14:33 ` Adalbert Lazăr
[not found] ` <5d52ca22.1c69fb81.4ceb8.e90bSMTPIN_ADDED_BROKEN@mx.google.com>
2019-08-13 14:35 ` Paolo Bonzini
2019-08-09 16:00 ` [RFC PATCH v6 76/92] kvm: x86: disable EPT A/D bits if introspection is present Adalbert Lazăr
2019-08-13 9:18 ` Paolo Bonzini
2019-08-09 16:00 ` [RFC PATCH v6 77/92] kvm: introspection: add trace functions Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 78/92] kvm: x86: add tracepoints for interrupt and exception injections Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 79/92] kvm: x86: emulate movsd xmm, m64 Adalbert Lazăr
2019-08-13 9:17 ` Paolo Bonzini
2019-08-09 16:00 ` [RFC PATCH v6 80/92] kvm: x86: emulate movss xmm, m32 Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 81/92] kvm: x86: emulate movq xmm, m64 Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 82/92] kvm: x86: emulate movq r, xmm Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 83/92] kvm: x86: emulate movd xmm, m32 Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 84/92] kvm: x86: enable the half part of movss, movsd, movups Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 85/92] kvm: x86: emulate lfence Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 86/92] kvm: x86: emulate xorpd xmm2/m128, xmm1 Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 87/92] kvm: x86: emulate xorps xmm/m128, xmm Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 88/92] kvm: x86: emulate fst/fstp m64fp Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 89/92] kvm: x86: make lock cmpxchg r, r/m atomic Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 90/92] kvm: x86: emulate lock cmpxchg8b atomically Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 91/92] kvm: x86: emulate lock cmpxchg16b m128 Adalbert Lazăr
2019-08-09 16:00 ` [RFC PATCH v6 92/92] kvm: x86: fallback to the single-step on multipage CMPXCHG emulation Adalbert Lazăr
2019-08-12 18:23 ` [RFC PATCH v6 00/92] VM introspection Sean Christopherson
2019-08-12 21:40 ` Sean Christopherson
2019-08-13 9:34 ` Paolo Bonzini
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