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From: David Edmondson <david.edmondson@oracle.com>
To: linux-kernel@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Joerg Roedel <joro@8bytes.org>, Ingo Molnar <mingo@redhat.com>,
	Jim Mattson <jmattson@google.com>,
	kvm@vger.kernel.org, Borislav Petkov <bp@alien8.de>,
	David Matlack <dmatlack@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org, Wanpeng Li <wanpengli@tencent.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	David Edmondson <david.edmondson@oracle.com>
Subject: [PATCH v3 0/3] kvm: x86: Convey the exit reason, etc. to user-space on emulation failure
Date: Thu, 29 Jul 2021 14:39:28 +0100	[thread overview]
Message-ID: <20210729133931.1129696-1-david.edmondson@oracle.com> (raw)

To help when debugging failures in the field, if instruction emulation
fails, report the VM exit reason to userspace in order that it can be
recorded.

Sean: hopefully this is something like what you intended. If not,
please clarify and I will have another go. The lack of an ABI for the
debug data does feel messy.

The SGX changes here are compiled but untested.

v3:
- Convey any debug data un-flagged after the ABI specified data in
  struct emulation_failure (Sean)
- Obey the ABI protocol in sgx_handle_emulation_failure() (Sean)

v2:
- Improve patch comments (dmatlock)
- Intel should provide the full exit reason (dmatlock)
- Pass a boolean rather than flags (dmatlock)
- Use the helper in kvm_task_switch() and kvm_handle_memory_failure()
  (dmatlock)
- Describe the exit_reason field of the emulation_failure structure
  (dmatlock)

David Edmondson (3):
  KVM: x86: kvm_x86_ops.get_exit_info should include the exit reason
  KVM: x86: On emulation failure, convey the exit reason, etc. to
    userspace
  KVM: x86: SGX must obey the KVM_INTERNAL_ERROR_EMULATION protocol

 arch/x86/include/asm/kvm_host.h | 12 ++++++--
 arch/x86/kvm/svm/svm.c          |  8 +++--
 arch/x86/kvm/trace.h            | 11 +++----
 arch/x86/kvm/vmx/nested.c       |  2 +-
 arch/x86/kvm/vmx/sgx.c          |  8 ++---
 arch/x86/kvm/vmx/vmx.c          | 11 ++++---
 arch/x86/kvm/x86.c              | 53 ++++++++++++++++++++++++++-------
 include/uapi/linux/kvm.h        |  7 +++++
 8 files changed, 79 insertions(+), 33 deletions(-)

-- 
2.30.2


             reply	other threads:[~2021-07-29 13:46 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29 13:39 David Edmondson [this message]
2021-07-29 13:39 ` [PATCH v3 1/3] KVM: x86: kvm_x86_ops.get_exit_info should include the exit reason David Edmondson
2021-07-29 22:27   ` Sean Christopherson
2021-07-30  7:29     ` David Edmondson
2021-07-29 13:39 ` [PATCH v3 2/3] KVM: x86: On emulation failure, convey the exit reason, etc. to userspace David Edmondson
2021-07-30 22:14   ` Sean Christopherson
2021-08-02  7:28     ` David Edmondson
2021-08-02 16:58       ` Sean Christopherson
2021-08-02 17:23         ` David Edmondson
2021-08-07  0:59           ` Sean Christopherson
2021-07-29 13:39 ` [PATCH v3 3/3] KVM: x86: SGX must obey the KVM_INTERNAL_ERROR_EMULATION protocol David Edmondson
2021-07-30 22:17   ` Sean Christopherson
2021-08-02  7:18     ` David Edmondson

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