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kvm: x86: Add "last CPU" to some KVM_EXIT information

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More often than not, a failed VM-entry in an x86 production
environment is induced by a defective CPU. To help identify the bad
hardware, include the id of the last logical CPU to run a vCPU in the
information provided to userspace on a KVM exit for failed VM-entry or
for KVM internal errors not associated with emulation. The presence of
this additional information is indicated by a new capability,
KVM_CAP_LAST_CPU.

Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Oliver Upton <oupton@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Message-Id: <20200603235623.245638-5-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jim Mattson
2020-06-03 16:56:21 -07:00
committed by Paolo Bonzini
parent 80a1684c01
commit 1aa561b1a4
5 changed files with 15 additions and 3 deletions
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Documentation/virt/kvm/api.rst
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@@ -4794,6 +4794,7 @@ hardware_exit_reason.
/* KVM_EXIT_FAIL_ENTRY */
struct {
__u64 hardware_entry_failure_reason;
__u32 cpu; /* if KVM_LAST_CPU */
} fail_entry;
If exit_reason is KVM_EXIT_FAIL_ENTRY, the vcpu could not be run due