From: Oliver Upton <oliver.upton@linux.dev>
To: Anish Moorthy <amoorthy@google.com>
Cc: Isaku Yamahata <isaku.yamahata@gmail.com>,
Marc Zyngier <maz@kernel.org>,
seanjc@google.com, jthoughton@google.com, kvm@vger.kernel.org
Subject: Re: [WIP Patch v2 04/14] KVM: x86: Add KVM_CAP_X86_MEMORY_FAULT_EXIT and associated kvm_run field
Date: Fri, 17 Mar 2023 19:30:15 +0000 [thread overview]
Message-ID: <ZBS/x/kP4Y+u8AOT@linux.dev> (raw)
In-Reply-To: <CAF7b7mrTa735kDaEsJQSHTt7gpWy_QZEtsgsnKoe6c21s0jDVw@mail.gmail.com>
On Fri, Mar 17, 2023 at 11:33:38AM -0700, Anish Moorthy wrote:
> On Thu, Mar 16, 2023 at 5:02 PM Isaku Yamahata <isaku.yamahata@gmail.com> wrote:
>
> > > +7.34 KVM_CAP_X86_MEMORY_FAULT_EXIT
> > > +----------------------------------
> > > +
> > > +:Architectures: x86
> >
> > Why x86 specific?
>
> Sean was the only one to bring this functionality up and originally
> did so in the context of some x86-specific functions, so I assumed
> that x86 was the only ask and that maybe the other architectures had
> alternative solutions. Admittedly I also wanted to avoid wading
> through another big set of -EFAULT references :/
There isn't much :) Sanity checks in mmu.c and some currently unhandled
failures to write guest memory in pvtime.c
> Those are the only reasons though. Marc, Oliver, should I bring this
> capability to Arm as well?
The x86 implementation shouldn't preclude UAPI reuse, but I'm not strongly
motivated in either direction on this. A clear use case where the exit
information is actionable rather than just informational would make the change
more desirable.
--
Thanks,
Oliver
next prev parent reply other threads:[~2023-03-17 19:30 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-15 2:17 [WIP Patch v2 00/14] Avoiding slow get-user-pages via memory fault exit Anish Moorthy
2023-03-15 2:17 ` [WIP Patch v2 01/14] KVM: selftests: Allow many vCPUs and reader threads per UFFD in demand paging test Anish Moorthy
2023-03-15 2:17 ` [WIP Patch v2 02/14] KVM: selftests: Use EPOLL in userfaultfd_util reader threads and signal errors via TEST_ASSERT Anish Moorthy
2023-03-15 2:17 ` [WIP Patch v2 03/14] KVM: Allow hva_pfn_fast to resolve read-only faults Anish Moorthy
2023-03-15 2:17 ` [WIP Patch v2 04/14] KVM: x86: Add KVM_CAP_X86_MEMORY_FAULT_EXIT and associated kvm_run field Anish Moorthy
2023-03-17 0:02 ` Isaku Yamahata
2023-03-17 18:33 ` Anish Moorthy
2023-03-17 19:30 ` Oliver Upton [this message]
2023-03-17 21:50 ` Sean Christopherson
2023-03-17 22:44 ` Anish Moorthy
2023-03-20 15:53 ` Sean Christopherson
2023-03-20 18:19 ` Anish Moorthy
2023-03-20 22:11 ` Anish Moorthy
2023-03-21 15:21 ` Sean Christopherson
2023-03-21 18:01 ` Anish Moorthy
2023-03-21 19:43 ` Sean Christopherson
2023-03-22 21:06 ` Anish Moorthy
2023-03-22 23:17 ` Sean Christopherson
2023-03-28 22:19 ` Anish Moorthy
2023-04-04 19:34 ` Sean Christopherson
2023-04-04 20:40 ` Anish Moorthy
2023-04-04 22:07 ` Sean Christopherson
2023-04-05 20:21 ` Anish Moorthy
2023-03-17 18:35 ` Oliver Upton
2023-03-15 2:17 ` [WIP Patch v2 05/14] KVM: x86: Implement memory fault exit for direct_map Anish Moorthy
2023-03-15 2:17 ` [WIP Patch v2 06/14] KVM: x86: Implement memory fault exit for kvm_handle_page_fault Anish Moorthy
2023-03-15 2:17 ` [WIP Patch v2 07/14] KVM: x86: Implement memory fault exit for setup_vmgexit_scratch Anish Moorthy
2023-03-15 2:17 ` [WIP Patch v2 08/14] KVM: x86: Implement memory fault exit for FNAME(fetch) Anish Moorthy
2023-03-15 2:17 ` [WIP Patch v2 09/14] KVM: Introduce KVM_CAP_MEMORY_FAULT_NOWAIT without implementation Anish Moorthy
2023-03-17 18:59 ` Oliver Upton
2023-03-17 20:15 ` Anish Moorthy
2023-03-17 20:54 ` Sean Christopherson
2023-03-17 23:42 ` Anish Moorthy
2023-03-20 15:13 ` Sean Christopherson
2023-03-20 19:53 ` Anish Moorthy
2023-03-17 20:17 ` Sean Christopherson
2023-03-20 22:22 ` Oliver Upton
2023-03-21 14:50 ` Sean Christopherson
2023-03-21 20:23 ` Oliver Upton
2023-03-21 21:01 ` Sean Christopherson
2023-03-15 2:17 ` [WIP Patch v2 10/14] KVM: x86: Implement KVM_CAP_MEMORY_FAULT_NOWAIT Anish Moorthy
2023-03-17 0:32 ` Isaku Yamahata
2023-03-15 2:17 ` [WIP Patch v2 11/14] KVM: arm64: Allow user_mem_abort to return 0 to signal a 'normal' exit Anish Moorthy
2023-03-17 18:18 ` Oliver Upton
2023-03-15 2:17 ` [WIP Patch v2 12/14] KVM: arm64: Implement KVM_CAP_MEMORY_FAULT_NOWAIT Anish Moorthy
2023-03-17 18:27 ` Oliver Upton
2023-03-17 19:00 ` Anish Moorthy
2023-03-17 19:03 ` Oliver Upton
2023-03-17 19:24 ` Sean Christopherson
2023-03-15 2:17 ` [WIP Patch v2 13/14] KVM: selftests: Add memslot_flags parameter to memstress_create_vm Anish Moorthy
2023-03-15 2:17 ` [WIP Patch v2 14/14] KVM: selftests: Handle memory fault exits in demand_paging_test Anish Moorthy
2023-03-17 17:43 ` [WIP Patch v2 00/14] Avoiding slow get-user-pages via memory fault exit Oliver Upton
2023-03-17 18:13 ` Sean Christopherson
2023-03-17 18:46 ` David Matlack
2023-03-17 18:54 ` Oliver Upton
2023-03-17 18:59 ` David Matlack
2023-03-17 19:53 ` Anish Moorthy
2023-03-17 22:03 ` Sean Christopherson
2023-03-20 15:56 ` Sean Christopherson
2023-03-17 20:35 ` Sean Christopherson
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