linux-kernel - [RFC PATCH v3 00/11] KVM: guest memory: Misc enhacnement

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Date:   Wed, 28 Jun 2023 15:42:59 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        linux-coco@...ts.linux.dev,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Ackerley Tng <ackerleytng@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Michael Roth <michael.roth@....com>,
        Yuan Yao <yuan.yao@...ux.intel.com>
Subject: [RFC PATCH v3 00/11] KVM: guest memory: Misc enhacnement

From: Isaku Yamahata <isaku.yamahata@...el.com>

Hello. I've updated the patch series based on the feedback. Here are the
discussion points.

- 06/11 KVM: x86: Introduce PFERR_GUEST_ENC_MASK to indicate fault is private
  Michael has his own opinion on how to indicate private fault.

- 09/11 KVM: Add new members to struct kvm_gfn_range to operate on

- 10/11 KVM: x86: Add gmem hook for initializing private memory
  SNP needs the callback. TDX won't use this one.

- 11/11 KVM: x86: Add gmem hook for invalidating private memory
  SNP needs the callback. TDX doesn't use this one at the moment, but would
  use it.
  
- VM type:
  I didn't rename KVM_X86_PROTECTED_VM to KVM_X86_SW_PROTECTED_VM  in this patch
  series.  It's easy to rename it if desired.

Thanks,

This is an RFC patch series based on KVM gmem [1] and [2] for the common use of
TDX and SEV-SNP.

[1] KVM gmem patches
https://github.com/sean-jc/linux/tree/x86/kvm_gmem_solo

[2] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
https://lore.kernel.org/lkml/20230612042559.375660-1-michael.roth@amd.com/

---
v3:
- Imported common patches from Michael Roth which can be useful for both SNP
  and TDX.  And reorder patches.
- Update struct kvm_gfn_range to drop flag, and add add only_private, and
  only_shared
- Update kvm_arch_set_memory_attributes() and added a x86 vendor callback for
  it.

v2:
https://lore.kernel.org/all/cover.1687474039.git.isaku.yamahata@intel.com/

v1:
https://lore.kernel.org/all/cover.1686858861.git.isaku.yamahata@intel.com/

Brijesh Singh (1):
  KVM: x86: Export the kvm_zap_gfn_range() for the SNP use

Isaku Yamahata (8):
  KVM: selftests: Fix test_add_overlapping_private_memory_regions()
  KVM: selftests: Fix guest_memfd()
  KVM: selftests: x86: typo in private_mem_conversions_test.c
  KVM: x86: Add is_vm_type_supported callback
  KVM: x86/mmu: Pass around full 64-bit error code for the KVM page
    fault
  KVM: x86: Introduce PFERR_GUEST_ENC_MASK to indicate fault is private
  KVM: Fix set_mem_attr ioctl when error case
  KVM: Add new members to struct kvm_gfn_range to operate on

Michael Roth (2):
  KVM: x86: Add gmem hook for initializing private memory
  KVM: x86: Add gmem hook for invalidating private memory

 arch/x86/include/asm/kvm-x86-ops.h            |  4 ++
 arch/x86/include/asm/kvm_host.h               | 12 +++++
 arch/x86/include/uapi/asm/kvm.h               |  1 +
 arch/x86/kvm/mmu.h                            |  2 -
 arch/x86/kvm/mmu/mmu.c                        | 51 ++++++++++++++-----
 arch/x86/kvm/mmu/mmu_internal.h               | 20 ++++++--
 arch/x86/kvm/mmu/mmutrace.h                   |  2 +-
 arch/x86/kvm/mmu/paging_tmpl.h                |  2 +-
 arch/x86/kvm/svm/svm.c                        |  7 +++
 arch/x86/kvm/vmx/vmx.c                        |  6 +++
 arch/x86/kvm/x86.c                            | 16 +++++-
 arch/x86/kvm/x86.h                            |  2 +
 include/linux/kvm_host.h                      | 16 ++++--
 .../testing/selftests/kvm/guest_memfd_test.c  |  4 +-
 .../selftests/kvm/set_memory_region_test.c    | 16 +++++-
 .../kvm/x86_64/private_mem_conversions_test.c |  2 +-
 virt/kvm/guest_mem.c                          | 50 +++++++++++++++++-
 virt/kvm/kvm_main.c                           | 24 +++++----
 18 files changed, 192 insertions(+), 45 deletions(-)


base-commit: be8abcec83c87d4e15ae04816b685fe260c4bcfd
-- 
2.25.1