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c4a37acc51
Allow userspace to set a vCPU's mp_state to INIT_RECEIVED in conjunction with a pending SMI, as rejecting that combination could result in KVM disallowing reflecting the output from KVM_GET_VCPU_EVENTS back into KVM via KVM_SET_VCPU_EVENTS. At the time the check was added, smi_pending could only be set in the context of KVM_RUN, with the vCPU in the RUNNABLE state. I.e. it was impossible for KVM to save vCPU state such that userspace could see a pending SMI for a vCPU in WFS. That no longer holds true now that KVM processes requested SMIs during KVM_GET_VCPU_EVENTS, e.g. if a vCPU receives an SMI while in WFS, and then userspace saves vCPU state. Note, this may partially re-open the user-triggerable WARN that was mostly closed by commit28bf288879("KVM: x86: fix user triggerable warning in kvm_apic_accept_events()"), but that WARN can already be triggered in several other ways, e.g. if userspace stuffs VMXON=1 after putting the vCPU into WFS. That issue will be addressed in an upcoming commit, in a more robust fashion (hopefully). Fixes:1f7becf1b7("KVM: x86: get smi pending status correctly") Link: https://lore.kernel.org/r/20250605195018.539901-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.