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From: "Adalbert Lazăr" <alazar@bitdefender.com>
To: Paolo Bonzini <pbonzini@redhat.com>, kvm@vger.kernel.org
Cc: linux-mm@kvack.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 Zhang" <yu.c.zhang@intel.com>,
	"Mihai Donțu" <mdontu@bitdefender.com>
Subject: Re: [RFC PATCH v6 06/92] kvm: introspection: add KVMI_CONTROL_CMD_RESPONSE
Date: Tue, 13 Aug 2019 20:08:27 +0300
Message-ID: <1565716107.4DfaBE.19731.@15f23d3a749365d981e968181cce585d2dcb3ffa> (raw)
In-Reply-To: <e8f59b08-734a-2ce1-ae28-3cc9d90c0bcb@redhat.com>

On Tue, 13 Aug 2019 11:15:34 +0200, Paolo Bonzini <pbonzini@redhat.com> wrote:
> On 09/08/19 17:59, Adalbert Lazăr wrote:
> > +If `now` is 1, the command reply is enabled/disabled (according to
> > +`enable`) starting with the current command. For example, `enable=0`
> > +and `now=1` means that the reply is disabled for this command too,
> > +while `enable=0` and `now=0` means that a reply will be send for this
> > +command, but not for the next ones (until enabled back with another
> > +*KVMI_CONTROL_CMD_RESPONSE*).
> > +
> > +This command is used by the introspection tool to disable the replies
> > +for commands returning an error code only (eg. *KVMI_SET_REGISTERS*)
> > +when an error is less likely to happen. For example, the following
> > +commands can be used to reply to an event with a single `write()` call:
> > +
> > +	KVMI_CONTROL_CMD_RESPONSE enable=0 now=1
> > +	KVMI_SET_REGISTERS vcpu=N
> > +	KVMI_EVENT_REPLY   vcpu=N
> > +	KVMI_CONTROL_CMD_RESPONSE enable=1 now=0
> 
> I don't understand the usage.  Is there any case where you want now == 1
> actually?  Can you just say that KVMI_CONTROL_CMD_RESPONSE never has a
> reply, or to make now==enable?

The enable=1 now=1 is for pause VM:

	KVMI_CONTROL_CMD_RESPONSE enable=0 now=1
	KVMI_PAUSE_VCPU 0
	KVMI_PAUSE_VCPU 1
	...
	KVMI_CONTROL_CMD_RESPONSE enable=1 now=1

We wait for a reply to make sure the vCPUs were stopped without waiting
for their pause events.

We can get around from userspace, if you like:

	KVMI_CONTROL_CMD_RESPONSE enable=0 now=1
	KVMI_PAUSE_VCPU 0
	KVMI_PAUSE_VCPU 1
	...
	KVMI_PAUSE_VCPU N-2
	KVMI_CONTROL_CMD_RESPONSE enable=1 now=0
	KVMI_PAUSE_VCPU N-1

> 
> > +	if (err)
> > +		kvmi_warn(ikvm, "Error code %d discarded for message id %d\n",
> > +			  err, msg->id);
> > +
> 
> Would it make sense to even close the socket if there is an error?
> 
> Paolo

Sure.


  reply index

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 [this message]
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
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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