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CR4.PAE - Unrestricted guest can only be enabled when EPT is enabled, and vmx_set_cr4() clears hardware CR0.PAE based on the guest's CR4.PAE, i.e. CR4.PAE always follows the guest's value when unrestricted guest is enabled. CR4.PSE - Unrestricted guest no longer uses the identity mapped IA32 page tables since CR0.PG can be cleared in hardware, thus there is no need to set CR4.PSE when paging is disabled in the guest (and EPT is enabled). Define KVM_VM_CR4_ALWAYS_ON_UNRESTRICTED_GUEST (to X86_CR4_VMXE) and use it in lieu of KVM_*MODE_VM_CR4_ALWAYS_ON when unrestricted guest is enabled, which removes the forcing of CR4.PAE. Skip the manipulation of CR4.PAE/PSE for EPT when unrestricted guest is enabled, as CR4.PAE isn't forced and so doesn't need to be manually cleared, and CR4.PSE does not need to be set when paging is disabled since the identity mapped IA32 page tables are not used. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> |
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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.