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On AMD, kvm_x86_ops->skip_emulated_instruction(vcpu) can, in theory, fail: in !nrips case we call kvm_emulate_instruction(EMULTYPE_SKIP). Currently, we only do printk(KERN_DEBUG) when this happens and this is not ideal. Propagate the error up the stack. On VMX, skip_emulated_instruction() doesn't fail, we have two call sites calling it explicitly: handle_exception_nmi() and handle_task_switch(), we can just ignore the result. On SVM, we also have two explicit call sites: svm_queue_exception() and it seems we don't need to do anything there as we check if RIP was advanced or not. In task_switch_interception(), however, we are better off not proceeding to kvm_task_switch() in case skip_emulated_instruction() failed. Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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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 Restructured Text 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.