linux-kernel - [PATCH v4 0/5] Refactor handling flow of KVM_SET

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Message-Id: <20200709043426.92712-1-xiaoyao.li@intel.com>
Date:   Thu,  9 Jul 2020 12:34:21 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [PATCH v4 0/5] Refactor handling flow of KVM_SET_CPUID*

4 Patches of v3 has been queued into kvm/queue branch. This v4 contains
the rest to refactor the flow of KVM_SET_CPUID* as:

1. cpuid check: check if userspace provides legal CPUID settings;

2. cpuid update: Update userspace provided CPUID settings. It currently
   only contains kvm_update_cpuid_runtime, which updates special CPUID
   bits based on the vcpu state, e.g., OSXSAVE, OSPKE. In the future, we
   can re-introduce kvm_update_cpuid() if KVM needs to force on/off some
   bits.

3. update vcpu states: Update vcpu states/settings based on the final updated
   CPUID settings. 

v4:
 - remove 4 queued patches
 - rebased to kvm/queue: c16ced9cc67a "x86/kvm/vmx: Use native read/write_cr2()"
 - fix one bug in v3 to call kvfree(cpuid_entries) in kvm_vcpu_ioctl_set_cpuid()
 - rename "update_vcpu_model" to "vcpu_after_set_cpuid" [Paolo]	
 - Add a new patch to extrace kvm_update_cpuid_runtime()

v3:
https://lkml.kernel.org/r/20200708065054.19713-1-xiaoyao.li@intel.com
 - Add a note in KVM api doc to state the previous CPUID configuration
   is not reliable if current KVM_SET_CPUID* fails [Jim]
 - Adjust Patch 2 to reduce code churn [Sean]
 - Commit message refine to add more justification [Sean]
 - Add a new patch 7

v2:
https://lkml.kernel.org/r/20200623115816.24132-1-xiaoyao.li@intel.com
 - rebase to kvm/queue: a037ff353ba6 ("Merge branch 'kvm-master' into HEAD")
 - change the name of kvm_update_state_based_on_cpuid() to
   kvm_update_vcpu_model() [Sean]
 - Add patch 5 to rename kvm_x86_ops.cpuid_date() to
   kvm_x86_ops.update_vcpu_model()

v1:
https://lkml.kernel.org/r/20200529085545.29242-1-xiaoyao.li@intel.com

Xiaoyao Li (5):
  KVM: x86: Introduce kvm_check_cpuid()
  KVM: x86: Extract kvm_update_cpuid_runtime() from kvm_update_cpuid()
  KVM: x86: Rename kvm_update_cpuid() to kvm_vcpu_after_set_cpuid()
  KVM: x86: Rename cpuid_update() callback to vcpu_after_set_cpuid()
  KVM: x86: Move kvm_x86_ops.vcpu_after_set_cpuid() into
    kvm_vcpu_after_set_cpuid()

 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/cpuid.c            | 99 +++++++++++++++++++++------------
 arch/x86/kvm/cpuid.h            |  2 +-
 arch/x86/kvm/lapic.c            |  2 +-
 arch/x86/kvm/svm/svm.c          |  4 +-
 arch/x86/kvm/vmx/nested.c       |  3 +-
 arch/x86/kvm/vmx/vmx.c          |  4 +-
 arch/x86/kvm/x86.c              | 10 ++--
 8 files changed, 76 insertions(+), 50 deletions(-)

-- 
2.18.4