linux-kernel - [RFC PATCH 0/6] KVM: guest memory: Misc enhacnement

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Message-Id: <cover.1686858861.git.isaku.yamahata@intel.com>
Date:   Thu, 15 Jun 2023 13:12:13 -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>
Subject: [RFC PATCH 0/6] KVM: guest memory: Misc enhacnement

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

Hello. This is an RFC patch series based on KVM gmem [1] and [2] 
for the common use of TDX and SEV-SNP.  I'd like to discuss three items.

* Flags for kvm_gfn_range:
Roth, By adding flags to kvm_gfn_range, kvm_arch_gmem_invalidate() won't be
needed.  Maybe x86 gmem_invalidate callback is still needed, though.

* Page fault error code or how to figure out the private page fault
There is an issue to set kvm_page_fault.is_private. I came up with two new
error codes.  Is this a way or any other way?

* VM type: Now we have KVM_X86_PROTECTED_VM. How do we proceed?
  - Keep KVM_X86_PROTECTED_VM for its use. Introduce KVM_X86_TDX_VM
  - Use KVM_X86_PROTECTED_VM for TDX. (If necessary, introduce another type in
    the future)
  - any other way?

[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/

Isaku Yamahata (6):
  KVM: selftests: Fix test_add_overlapping_private_memory_regions()
  KVM: selftests: Fix guest_memfd()
  KVM: x86/mmu: Pass round full 64-bit error code for the KVM page fault
  KVM: x86: Introduce PFERR_GUEST_ENC_MASK to indicate fault is private
  KVM: Add flags to struct kvm_gfn_range
  KVM: x86: Add is_vm_type_supported callback

 arch/x86/include/asm/kvm-x86-ops.h               |  1 +
 arch/x86/include/asm/kvm_host.h                  |  5 +++++
 arch/x86/include/uapi/asm/kvm.h                  |  1 +
 arch/x86/kvm/mmu/mmu.c                           | 14 +++++++++-----
 arch/x86/kvm/mmu/mmu_internal.h                  |  8 ++++----
 arch/x86/kvm/mmu/mmutrace.h                      |  2 +-
 arch/x86/kvm/mmu/paging_tmpl.h                   |  4 ++--
 arch/x86/kvm/svm/svm.c                           |  7 +++++++
 arch/x86/kvm/vmx/vmx.c                           |  6 ++++++
 arch/x86/kvm/x86.c                               | 10 +++++++++-
 arch/x86/kvm/x86.h                               |  2 ++
 include/linux/kvm_host.h                         | 11 ++++++++++-
 tools/testing/selftests/kvm/guest_memfd_test.c   |  4 ++--
 .../selftests/kvm/set_memory_region_test.c       | 16 ++++++++++++++--
 virt/kvm/guest_mem.c                             | 10 +++++++---
 virt/kvm/kvm_main.c                              |  4 +++-
 16 files changed, 83 insertions(+), 22 deletions(-)


base-commit: be8abcec83c87d4e15ae04816b685fe260c4bcfd
-- 
2.25.1