On 18/11/2015 06:43, Huaitong Han wrote: > Changes in v3: > *Add comments for patch that disable PKU feature without ept. > > Changes in v2: > *Add pku.c for kvm-unit-tests. > *Optimize permission_fault codes for patch4. > *Delete is_long_mode and PK for patch5. > *Squash cpuid and cr4 patches. > > The protection-key feature provides an additional mechanism by which IA-32e > paging controls access to usermode addresses. > > Hardware support for protection keys for user pages is enumerated with CPUID > feature flag CPUID.7.0.ECX[3]:PKU. Software support is CPUID.7.0.ECX[4]:OSPKE > with the setting of CR4.PKE(bit 22). > > When CR4.PKE = 1, every linear address is associated with the 4-bit protection > key located in bits 62:59 of the paging-structure entry that mapped the page > containing the linear address. The PKRU register determines, for each > protection key, whether user-mode addresses with that protection key may be > read or written. > > The PKRU register (protection key rights for user pages) is a 32-bit register > with the following format: for each i (0 ≤ i ≤ 15), PKRU[2i] is the > access-disable bit for protection key i (ADi); PKRU[2i+1] is the write-disable > bit for protection key i (WDi). > > Software can use the RDPKRU and WRPKRU instructions with ECX = 0 to read and > write PKRU. In addition, the PKRU register is XSAVE-managed state and can thus > be read and written by instructions in the XSAVE feature set. > > PFEC.PK (bit 5) is defined as protection key violations. > > The specification of Protection Keys can be found at SDM (4.6.2, volume 3) > http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-manual-325462.pdf. > > The kernel native patchset have not yet been merged to upstream, you can found > at git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-pkeys.git pkeys-v007. > > Huaitong Han (7): > KVM, pkeys: expose CPUID/CR4 to guest > KVM, pkeys: disable pkeys for guests in non-paging mode > KVM, pkeys: update memeory permission bitmask for pkeys > KVM, pkeys: add pkeys support for permission_fault logic > KVM, pkeys: Add pkeys support for gva_to_gpa funcions > KVM, pkeys: add pkeys support for xsave state > KVM, pkeys: disable PKU feature without ept > > arch/x86/include/asm/kvm_host.h | 11 +++++--- > arch/x86/kvm/cpuid.c | 24 ++++++++++++++++-- > arch/x86/kvm/cpuid.h | 8 ++++++ > arch/x86/kvm/mmu.c | 32 +++++++++++++++++++++-- > arch/x86/kvm/mmu.h | 56 +++++++++++++++++++++++++++++++++++++---- > arch/x86/kvm/paging_tmpl.h | 18 ++++++++++--- > arch/x86/kvm/vmx.c | 10 ++++---- > arch/x86/kvm/x86.c | 27 ++++++++++++++------ > arch/x86/kvm/x86.h | 3 ++- > 9 files changed, 161 insertions(+), 28 deletions(-) > Looks good, but it will have to wait for kernel PKU support. Thanks, Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
