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SubjectRe: [PATCH v4 0/5] KVM: PKS Virtualization support
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On 05/02/21 09:37, Chenyi Qiang wrote:
> 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@intel.com/
>
> 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@intel.com/
>
> 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@intel.com/
> - add MSR_IA32_PKRS to the vmx_possible_passthrough_msrs[]
> - RFC v2: https://lore.kernel.org/lkml/20201014021157.18022-1-chenyi.qiang@intel.com/
>
> 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@intel.com/
>
> ---
>
> 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(-)
>

Looks mostly good, but I'll only be able to include it after the bare
metal implementation is in.

Paolo

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