Protection Keys for Supervisor Pages(PKS) is a feature that extends the Protection Keys architecture to support thread-specific permission restrictions on supervisor pages. PKS works similar to an existing feature named PKU(protecting user pages). They both perform an additional check after all legacy access permissions checks are done. If violated, #PF occurs and PFEC.PK bit will be set. PKS introduces MSR IA32_PKRS to manage supervisor protection key rights. The MSR contains 16 pairs of ADi and WDi bits. Each pair advertises on a group of pages with the same key which is set in the leaf paging-structure entries(bits[62:59]). Currently, IA32_PKRS is not supported by XSAVES architecture. This patchset aims to add the virtualization of PKS in KVM. It implemented PKS CPUID enumeration, vmentry/vmexit configuration, MSR exposure, nested supported etc. Currently, PKS is not yet supported for shadow paging. PKS bare metal support: https://lore.kernel.org/lkml/20201106232908.364581-1-ira.weiny@xxxxxxxxx/ Detailed information about PKS can be found in the latest Intel 64 and IA-32 Architectures Software Developer's Manual. --- Changelogs: v3->v4 - Make the MSR intercept and load-controls setting depend on CR4.PKS value - shadow the guest pkrs and make it usable in PKS emultion - add the cr4_pke and cr4_pks check in pkr_mask update - squash PATCH 2 and PATCH 5 to make the dependencies read more clear - v3: https://lore.kernel.org/lkml/20201105081805.5674-1-chenyi.qiang@xxxxxxxxx/ v2->v3: - No function changes since last submit - rebase on the latest PKS kernel support: https://lore.kernel.org/lkml/20201102205320.1458656-1-ira.weiny@xxxxxxxxx/ - add MSR_IA32_PKRS to the vmx_possible_passthrough_msrs[] - RFC v2: https://lore.kernel.org/lkml/20201014021157.18022-1-chenyi.qiang@xxxxxxxxx/ v1->v2: - rebase on the latest PKS kernel support: https://github.com/weiny2/linux-kernel/tree/pks-rfc-v3 - add a kvm-unit-tests for PKS - add the check in kvm_init_msr_list for PKRS - place the X86_CR4_PKS in mmu_role_bits in kvm_set_cr4 - add the support to expose VM_{ENTRY, EXIT}_LOAD_IA32_PKRS in nested VMX MSR - RFC v1: https://lore.kernel.org/lkml/20200807084841.7112-1-chenyi.qiang@xxxxxxxxx/ --- Chenyi Qiang (5): KVM: VMX: Introduce PKS VMCS fields KVM: X86: Expose PKS to guest KVM: MMU: Rename the pkru to pkr KVM: MMU: Add support for PKS emulation KVM: VMX: Enable PKS for nested VM arch/x86/include/asm/kvm_host.h | 17 +++--- arch/x86/include/asm/pkeys.h | 1 + arch/x86/include/asm/vmx.h | 6 ++ arch/x86/kvm/cpuid.c | 3 +- arch/x86/kvm/mmu.h | 23 ++++---- arch/x86/kvm/mmu/mmu.c | 81 +++++++++++++++------------ arch/x86/kvm/vmx/capabilities.h | 6 ++ arch/x86/kvm/vmx/nested.c | 38 ++++++++++++- arch/x86/kvm/vmx/vmcs.h | 1 + arch/x86/kvm/vmx/vmcs12.c | 2 + arch/x86/kvm/vmx/vmcs12.h | 6 +- arch/x86/kvm/vmx/vmx.c | 99 +++++++++++++++++++++++++++++++-- arch/x86/kvm/vmx/vmx.h | 1 + arch/x86/kvm/x86.c | 11 +++- arch/x86/kvm/x86.h | 8 +++ arch/x86/mm/pkeys.c | 6 ++ include/linux/pkeys.h | 4 ++ 17 files changed, 249 insertions(+), 64 deletions(-) -- 2.17.1
