[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 00/10] x86/hvm: pkeys, add memory protection-key support
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 â i â 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. Huaitong Han (10): x86/hvm: pkeys, add pkeys support for cpuid handling x86/hvm: pkeys, add pku support for x86_capability x86/hvm: pkeys, add the flag to enable Memory Protection Keys x86/hvm: pkeys, add pkeys support when setting CR4 x86/hvm: pkeys, disable pkeys for guests in non-paging mode x86/hvm: pkeys, add functions to get pkeys value from PTE x86/hvm: pkeys, add functions to support PKRU access/write x86/hvm: pkeys, add pkeys support for do_page_fault x86/hvm: pkeys, add pkeys support for guest_walk_tables x86/hvm: pkeys, add xstate support for pkeys docs/misc/xen-command-line.markdown | 7 +++++ tools/libxc/xc_cpufeature.h | 2 ++ tools/libxc/xc_cpuid_x86.c | 6 ++-- xen/arch/x86/cpu/common.c | 5 ++-- xen/arch/x86/hvm/hvm.c | 11 ++++++- xen/arch/x86/hvm/vmx/vmx.c | 11 +++---- xen/arch/x86/mm/guest_walk.c | 57 ++++++++++++++++++++++++++++++++++++- xen/arch/x86/setup.c | 9 ++++++ xen/arch/x86/traps.c | 47 +++++++++++++++++++++++++----- xen/include/asm-x86/cpufeature.h | 7 ++++- xen/include/asm-x86/guest_pt.h | 11 +++++++ xen/include/asm-x86/hvm/hvm.h | 2 ++ xen/include/asm-x86/page.h | 7 +++++ xen/include/asm-x86/processor.h | 53 +++++++++++++++++++++++++++++----- xen/include/asm-x86/x86_64/page.h | 14 +++++++++ xen/include/asm-x86/xstate.h | 3 +- 16 files changed, 225 insertions(+), 27 deletions(-) -- 2.4.3 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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