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When a guest causes a page fault which requires emulation, the vcpu->arch.gpa_available flag is set to indicate that cr2 contains a valid GPA. Currently, emulator_read_write_onepage() makes use of gpa_available flag to avoid a guest page walk for a known MMIO regions. Lets not limit the gpa_available optimization to just MMIO region. The patch extends the check to avoid page walk whenever gpa_available flag is set. Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> [Fix EPT=0 according to Wanpeng Li's fix, plus ensure VMX also uses the new code. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> [Moved "ret < 0" to the else brach, as per David's review. - Radim] Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.