From: Sean Christopherson <seanjc@google.com>
To: Anish Moorthy <amoorthy@google.com>
Cc: Xiaoyao Li <xiaoyao.li@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
Huacai Chen <chenhuacai@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Anup Patel <anup@brainfault.org>,
kvm@vger.kernel.org, kvmarm@lists.linux.dev,
kvm-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
Chao Peng <chao.p.peng@linux.intel.com>,
Fuad Tabba <tabba@google.com>,
Jarkko Sakkinen <jarkko@kernel.org>,
Yu Zhang <yu.c.zhang@linux.intel.com>,
Isaku Yamahata <isaku.yamahata@intel.com>,
Xu Yilun <yilun.xu@intel.com>, Vlastimil Babka <vbabka@suse.cz>,
Vishal Annapurve <vannapurve@google.com>,
Ackerley Tng <ackerleytng@google.com>,
Maciej Szmigiero <mail@maciej.szmigiero.name>,
David Hildenbrand <david@redhat.com>,
Quentin Perret <qperret@google.com>,
Michael Roth <michael.roth@amd.com>, Wang <wei.w.wang@intel.com>,
Liam Merwick <liam.merwick@oracle.com>,
Isaku Yamahata <isaku.yamahata@gmail.com>
Subject: Re: [RFC PATCH v12 07/33] KVM: Add KVM_EXIT_MEMORY_FAULT exit to report faults to userspace
Date: Tue, 3 Oct 2023 16:46:26 -0700 [thread overview]
Message-ID: <ZRyn0nPQpbVpz8ah@google.com> (raw)
In-Reply-To: <CAF7b7mqyU059YpBBVYjTMNXf9VHSc6tbKrQ8avFXYtP6LWMh8Q@mail.gmail.com>
On Tue, Oct 03, 2023, Anish Moorthy wrote:
> On Mon, Oct 2, 2023 at 6:43 PM Sean Christopherson <seanjc@google.com> wrote:
> >
> > > - I should go drop the patches annotating kvm_vcpu_read/write_page
> > > from my series
> >
> > Hold up on that. I'd prefer to keep them as there's still value in giving userspace
> > debug information. All I'm proposing is that we would firmly state in the
> > documentation that those paths must be treated as informational-only.
>
> Userspace would then need to know whether annotations were performed
> from reliable/unreliable paths though, right? That'd imply another
> flag bit beyond the current R/W/E bits.
No, what's missing is a guarantee in KVM that every attempt to exit will actually
make it to userspace. E.g. if a different exit, including another memory_fault
exit, clobbers an attempt to exit, the "unreliable" annotation will never be seen
by userspace.
The only way a KVM_EXIT_MEMORY_FAULT that actually reaches userspace could be
"unreliable" is if something other than a memory_fault exit clobbered the union,
but didn't signal its KVM_EXIT_* reason. And that would be an egregious bug that
isn't unique to KVM_EXIT_MEMORY_FAULT, i.e. the same data corruption would affect
each and every other KVM_EXIT_* reason.
The "informational only" part is that userspace can't develop features that
*require* KVM to exit.
> > > - The helper function [a] for filling the memory_fault field
> > > (downgraded back into the current union) can drop the "has the field
> > > already been filled?" check/WARN.
> >
> > That would need to be dropped regardless because it's user-triggered (sadly).
>
> Well the current v5 of the series uses a non-userspace visible canary-
> it seems like there'd still be value in that if we were to keep the
> annotations in potentially unreliable spots. Although perhaps that
> test failure you noticed [1] is a good counter-argument, since it
> shows a known case where a current flow does multiple writes to the
> memory_fault member.
The problem is that anything but a WARN will go unnoticed, and we can't have any
WARNs that are user-triggerable, at least not in upstream. Internally, we can
and probably should add a canary, and an aggressive one at that, but I can't think
of a sane way to add a canary in upstream while avoiding the known offenders. :-(
> [1] https://lore.kernel.org/all/202309141107.30863e9d-oliver.sang@intel.com
>
> > Anyways, don't do anything just yet.
>
> :salutes:
LOL
next prev parent reply other threads:[~2023-10-03 23:46 UTC|newest]
Thread overview: 301+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-14 1:54 [RFC PATCH v12 00/33] KVM: guest_memfd() and per-page attributes Sean Christopherson
2023-09-14 1:54 ` Sean Christopherson
2023-09-14 1:54 ` Sean Christopherson
2023-09-14 1:54 ` Sean Christopherson
2023-09-14 1:54 ` [RFC PATCH v12 01/33] KVM: Tweak kvm_hva_range and hva_handler_t to allow reusing for gfn ranges Sean Christopherson
2023-09-14 1:54 ` Sean Christopherson
2023-09-14 1:54 ` Sean Christopherson
2023-09-14 1:54 ` Sean Christopherson
2023-09-15 6:47 ` Xiaoyao Li
2023-09-15 6:47 ` Xiaoyao Li
2023-09-15 6:47 ` Xiaoyao Li
2023-09-15 6:47 ` Xiaoyao Li
2023-09-15 21:05 ` Sean Christopherson
2023-09-15 21:05 ` Sean Christopherson
2023-09-15 21:05 ` Sean Christopherson
2023-09-15 21:05 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 02/33] KVM: Use gfn instead of hva for mmu_notifier_retry Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 3:07 ` Binbin Wu
2023-09-14 3:07 ` Binbin Wu
2023-09-14 3:07 ` Binbin Wu
2023-09-14 3:07 ` Binbin Wu
2023-09-14 14:19 ` Sean Christopherson
2023-09-14 14:19 ` Sean Christopherson
2023-09-14 14:19 ` Sean Christopherson
2023-09-14 14:19 ` Sean Christopherson
2023-09-20 6:07 ` Xu Yilun
2023-09-20 6:07 ` Xu Yilun
2023-09-20 6:07 ` Xu Yilun
2023-09-20 6:07 ` Xu Yilun
2023-09-20 13:55 ` Sean Christopherson
2023-09-20 13:55 ` Sean Christopherson
2023-09-20 13:55 ` Sean Christopherson
2023-09-20 13:55 ` Sean Christopherson
2023-09-21 2:39 ` Xu Yilun
2023-09-21 2:39 ` Xu Yilun
2023-09-21 2:39 ` Xu Yilun
2023-09-21 2:39 ` Xu Yilun
2023-09-21 14:24 ` Sean Christopherson
2023-09-21 14:24 ` Sean Christopherson
2023-09-21 14:24 ` Sean Christopherson
2023-09-21 14:24 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 03/33] KVM: PPC: Drop dead code related to KVM_ARCH_WANT_MMU_NOTIFIER Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 04/33] KVM: PPC: Return '1' unconditionally for KVM_CAP_SYNC_MMU Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 05/33] KVM: Convert KVM_ARCH_WANT_MMU_NOTIFIER to CONFIG_KVM_GENERIC_MMU_NOTIFIER Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-10-09 16:42 ` Anup Patel
2023-10-09 16:42 ` Anup Patel
2023-10-09 16:42 ` Anup Patel
2023-10-09 16:42 ` Anup Patel
2023-09-14 1:55 ` [RFC PATCH v12 06/33] KVM: Introduce KVM_SET_USER_MEMORY_REGION2 Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-15 6:59 ` Xiaoyao Li
2023-09-15 6:59 ` Xiaoyao Li
2023-09-15 6:59 ` Xiaoyao Li
2023-09-15 6:59 ` Xiaoyao Li
2023-09-14 1:55 ` [RFC PATCH v12 07/33] KVM: Add KVM_EXIT_MEMORY_FAULT exit to report faults to userspace Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-22 6:03 ` Xiaoyao Li
2023-09-22 6:03 ` Xiaoyao Li
2023-09-22 6:03 ` Xiaoyao Li
2023-09-22 6:03 ` Xiaoyao Li
2023-09-22 14:30 ` Sean Christopherson
2023-09-22 14:30 ` Sean Christopherson
2023-09-22 14:30 ` Sean Christopherson
2023-09-22 14:30 ` Sean Christopherson
2023-09-22 16:28 ` Sean Christopherson
2023-09-22 16:35 ` Sean Christopherson
2023-10-02 22:33 ` Anish Moorthy
2023-10-03 1:42 ` Sean Christopherson
2023-10-03 22:59 ` Anish Moorthy
2023-10-03 23:46 ` Sean Christopherson [this message]
2023-10-05 22:07 ` Anish Moorthy
2023-10-05 22:46 ` Sean Christopherson
2023-10-10 22:21 ` David Matlack
2023-10-13 18:45 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 08/33] KVM: Add a dedicated mmu_notifier flag for reclaiming freed memory Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 09/33] KVM: Drop .on_unlock() mmu_notifier hook Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 10/33] KVM: Set the stage for handling only shared mappings in mmu_notifier events Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-18 1:14 ` Binbin Wu
2023-09-18 1:14 ` Binbin Wu
2023-09-18 1:14 ` Binbin Wu
2023-09-18 1:14 ` Binbin Wu
2023-09-18 15:57 ` Sean Christopherson
2023-09-18 15:57 ` Sean Christopherson
2023-09-18 15:57 ` Sean Christopherson
2023-09-18 15:57 ` Sean Christopherson
2023-09-18 18:07 ` Michael Roth
2023-09-18 18:07 ` Michael Roth
2023-09-18 18:07 ` Michael Roth
2023-09-18 18:07 ` Michael Roth
2023-09-19 0:08 ` Sean Christopherson
2023-09-19 0:08 ` Sean Christopherson
2023-09-19 0:08 ` Sean Christopherson
2023-09-19 0:08 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 11/33] KVM: Introduce per-page memory attributes Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-15 6:32 ` Yan Zhao
2023-09-15 6:32 ` Yan Zhao
2023-09-15 6:32 ` Yan Zhao
2023-09-15 6:32 ` Yan Zhao
2023-09-20 21:00 ` Sean Christopherson
2023-09-20 21:00 ` Sean Christopherson
2023-09-20 21:00 ` Sean Christopherson
2023-09-20 21:00 ` Sean Christopherson
2023-09-21 1:21 ` Yan Zhao
2023-09-21 1:21 ` Yan Zhao
2023-09-21 1:21 ` Yan Zhao
2023-09-21 1:21 ` Yan Zhao
2023-09-25 17:37 ` Sean Christopherson
2023-09-25 17:37 ` Sean Christopherson
2023-09-25 17:37 ` Sean Christopherson
2023-09-25 17:37 ` Sean Christopherson
2023-09-18 7:51 ` Binbin Wu
2023-09-18 7:51 ` Binbin Wu
2023-09-18 7:51 ` Binbin Wu
2023-09-18 7:51 ` Binbin Wu
2023-09-20 21:03 ` Sean Christopherson
2023-09-20 21:03 ` Sean Christopherson
2023-09-20 21:03 ` Sean Christopherson
2023-09-20 21:03 ` Sean Christopherson
2023-09-27 5:19 ` Binbin Wu
2023-09-27 5:19 ` Binbin Wu
2023-09-27 5:19 ` Binbin Wu
2023-09-27 5:19 ` Binbin Wu
2023-10-03 12:47 ` Fuad Tabba
2023-10-03 12:47 ` Fuad Tabba
2023-10-03 12:47 ` Fuad Tabba
2023-10-03 12:47 ` Fuad Tabba
2023-10-03 15:59 ` Sean Christopherson
2023-10-03 15:59 ` Sean Christopherson
2023-10-03 15:59 ` Sean Christopherson
2023-10-03 15:59 ` Sean Christopherson
2023-10-03 18:33 ` Fuad Tabba
2023-10-03 18:33 ` Fuad Tabba
2023-10-03 18:33 ` Fuad Tabba
2023-10-03 18:33 ` Fuad Tabba
2023-10-03 20:51 ` Sean Christopherson
2023-10-03 20:51 ` Sean Christopherson
2023-10-03 20:51 ` Sean Christopherson
2023-10-03 20:51 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 12/33] mm: Add AS_UNMOVABLE to mark mapping as completely unmovable Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 13/33] security: Export security_inode_init_security_anon() for use by KVM Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 14/33] KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-15 6:11 ` Yan Zhao
2023-09-15 6:11 ` Yan Zhao
2023-09-15 6:11 ` Yan Zhao
2023-09-15 6:11 ` Yan Zhao
2023-09-18 16:36 ` Michael Roth
2023-09-18 16:36 ` Michael Roth
2023-09-18 16:36 ` Michael Roth
2023-09-18 16:36 ` Michael Roth
2023-09-20 23:44 ` Sean Christopherson
2023-09-20 23:44 ` Sean Christopherson
2023-09-20 23:44 ` Sean Christopherson
2023-09-20 23:44 ` Sean Christopherson
2023-09-19 9:01 ` Binbin Wu
2023-09-19 9:01 ` Binbin Wu
2023-09-19 9:01 ` Binbin Wu
2023-09-19 9:01 ` Binbin Wu
2023-09-20 14:24 ` Sean Christopherson
2023-09-20 14:24 ` Sean Christopherson
2023-09-20 14:24 ` Sean Christopherson
2023-09-20 14:24 ` Sean Christopherson
2023-09-21 5:58 ` Binbin Wu
2023-09-21 5:58 ` Binbin Wu
2023-09-21 5:58 ` Binbin Wu
2023-09-21 5:58 ` Binbin Wu
2023-09-21 19:10 ` Sean Christopherson
2023-09-21 19:10 ` Sean Christopherson
2023-09-21 19:10 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 15/33] KVM: Add transparent hugepage support for dedicated guest memory Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 16/33] KVM: x86: "Reset" vcpu->run->exit_reason early in KVM_RUN Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 17/33] KVM: x86: Disallow hugepages when memory attributes are mixed Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 18/33] KVM: x86/mmu: Handle page fault for private memory Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-15 5:40 ` Yan Zhao
2023-09-15 5:40 ` Yan Zhao
2023-09-15 5:40 ` Yan Zhao
2023-09-15 5:40 ` Yan Zhao
2023-09-15 14:26 ` Sean Christopherson
2023-09-15 14:26 ` Sean Christopherson
2023-09-15 14:26 ` Sean Christopherson
2023-09-15 14:26 ` Sean Christopherson
2023-09-18 0:54 ` Yan Zhao
2023-09-18 0:54 ` Yan Zhao
2023-09-18 0:54 ` Yan Zhao
2023-09-18 0:54 ` Yan Zhao
2023-09-21 14:59 ` Sean Christopherson
2023-09-21 14:59 ` Sean Christopherson
2023-09-21 14:59 ` Sean Christopherson
2023-09-21 14:59 ` Sean Christopherson
2023-09-21 5:51 ` Binbin Wu
2023-09-21 5:51 ` Binbin Wu
2023-09-21 5:51 ` Binbin Wu
2023-09-21 5:51 ` Binbin Wu
2023-09-14 1:55 ` [RFC PATCH v12 19/33] KVM: Drop superfluous __KVM_VCPU_MULTIPLE_ADDRESS_SPACE macro Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 20/33] KVM: Allow arch code to track number of memslot address spaces per VM Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 21/33] KVM: x86: Add support for "protected VMs" that can utilize private memory Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 22/33] KVM: selftests: Drop unused kvm_userspace_memory_region_find() helper Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 23/33] KVM: selftests: Convert lib's mem regions to KVM_SET_USER_MEMORY_REGION2 Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 24/33] KVM: selftests: Add support for creating private memslots Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 25/33] KVM: selftests: Add helpers to convert guest memory b/w private and shared Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 26/33] KVM: selftests: Add helpers to do KVM_HC_MAP_GPA_RANGE hypercalls (x86) Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 27/33] KVM: selftests: Introduce VM "shape" to allow tests to specify the VM type Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 28/33] KVM: selftests: Add GUEST_SYNC[1-6] macros for synchronizing more data Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 29/33] KVM: selftests: Add x86-only selftest for private memory conversions Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 30/33] KVM: selftests: Add KVM_SET_USER_MEMORY_REGION2 helper Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 31/33] KVM: selftests: Expand set_memory_region_test to validate guest_memfd() Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 32/33] KVM: selftests: Add basic selftest for guest_memfd() Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` [RFC PATCH v12 33/33] KVM: selftests: Test KVM exit behavior for private memory/access Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
2023-09-14 1:55 ` Sean Christopherson
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