[PATCH v3 00/25] KVM: VMX: Support updated eVMCSv1 revision + use vmcs_config for L1 VMX MSRs

Vitaly Kuznetsov
2022-07-08T14:42:41Z

This series continues:
- "[PATCH v2 00/28] KVM: VMX: Support TscScaling and EnclsExitingBitmap
with eVMCS + use vmcs_config for L1 VMX MSRs" work:
https://lore.kernel.org/kvm/20220629150625.238286-1-vkuznets@redhat.com/

Changes since v1:
- Turns out the updated eVMCSv1 revision comes with a CPUID feature bit
and this changes a lot as we don't need to invent our own eVMCS
revisions. Adjust the whole series accordingly, drop now unneeded
KVM_CAP_HYPERV_ENLIGHTENED_VMCS2.
- VM_{EXIT,ENTRY}_LOAD_IA32_PERF_GLOBAL_CTRL are now supported for both
Hyper-V on KVM and KVM on Hyper-V.
- Make CPU_BASED_NMI_WINDOW_EXITING optional [Sean].
- Drop erroneous "KVM: VMX: Add missing VMENTRY controls to vmcs_config"
[Jim].
- Include Jim's "KVM: x86: VMX: Replace some Intel model numbers with
mnemonics" into the series.
- "KVM: nVMX: Always set required-1 bits of pinbased_ctls to
PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR" added [Jim]. It allows to get rid
of required-1 bits caching in vmcs_config, patches dropped.
- Collect R-b tags [Jim].
- Other minor tweaks (descriptions, comments) [Jim, Sean].

Original description:

Enlightened VMCS v1 definition was updates to include fields for the
following features:
- PerfGlobalCtrl
- EnclsExitingBitmap
- TSC scaling
- GuestLbrCtl
- CET
- SSP
While the information is missing in the publicly available TLFS, the
updated definition comes with a new feature bit in CPUID.0x4000000A.EBX
(BIT 0). Use a made up HV_X64_NESTED_EVMCS1_2022_UPDATE name for it.

Add support for the new revision to KVM. SSP, CET and GuestLbrCtl
features are not currently supported by KVM.

While on it, implement Sean's idea to use vmcs_config for setting up
L1 VMX control MSRs instead of re-reading host MSRs.

Jim Mattson (1):
KVM: x86: VMX: Replace some Intel model numbers with mnemonics

Sean Christopherson (1):
KVM: VMX: Adjust CR3/INVPLG interception for EPT=y at runtime, not
setup

Vitaly Kuznetsov (23):
KVM: x86: hyper-v: Expose access to debug MSRs in the partition
privilege flags
x86/hyperv: Fix 'struct hv_enlightened_vmcs' definition
x86/hyperv: Update 'struct hv_enlightened_vmcs' definition
KVM: VMX: Define VMCS-to-EVMCS conversion for the new fields
KVM: nVMX: Support several new fields in eVMCSv1
KVM: x86: hyper-v: Cache HYPERV_CPUID_NESTED_FEATURES CPUID leaf
KVM: selftests: Add ENCLS_EXITING_BITMAP{,HIGH} VMCS fields
KVM: selftests: Switch to updated eVMCSv1 definition
KVM: VMX: nVMX: Support TSC scaling and PERF_GLOBAL_CTRL with
enlightened VMCS
KVM: selftests: Enable TSC scaling in evmcs selftest
KVM: VMX: Get rid of eVMCS specific VMX controls sanitization
KVM: VMX: Check VM_ENTRY_IA32E_MODE in setup_vmcs_config()
KVM: VMX: Check CPU_BASED_{INTR,NMI}_WINDOW_EXITING in
setup_vmcs_config()
KVM: VMX: Tweak the special handling of SECONDARY_EXEC_ENCLS_EXITING
in setup_vmcs_config()
KVM: VMX: Extend VMX controls macro shenanigans
KVM: VMX: Move CPU_BASED_CR8_{LOAD,STORE}_EXITING filtering out of
setup_vmcs_config()
KVM: VMX: Add missing VMEXIT controls to vmcs_config
KVM: VMX: Add missing CPU based VM execution controls to vmcs_config
KVM: VMX: Move LOAD_IA32_PERF_GLOBAL_CTRL errata handling out of
setup_vmcs_config()
KVM: nVMX: Always set required-1 bits of pinbased_ctls to
PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR
KVM: nVMX: Use sanitized allowed-1 bits for VMX control MSRs
KVM: VMX: Cache MSR_IA32_VMX_MISC in vmcs_config
KVM: nVMX: Use cached host MSR_IA32_VMX_MISC value for setting up
nested MSR

arch/x86/include/asm/hyperv-tlfs.h | 22 +-
arch/x86/include/asm/kvm_host.h | 2 +
arch/x86/kvm/hyperv.c | 12 +-
arch/x86/kvm/vmx/capabilities.h | 14 +-
arch/x86/kvm/vmx/evmcs.c | 127 +++++++---
arch/x86/kvm/vmx/evmcs.h | 18 +-
arch/x86/kvm/vmx/nested.c | 70 ++++--
arch/x86/kvm/vmx/nested.h | 2 +-
arch/x86/kvm/vmx/vmx.c | 235 ++++++++----------
arch/x86/kvm/vmx/vmx.h | 116 +++++++++
include/asm-generic/hyperv-tlfs.h | 2 +
.../selftests/kvm/include/x86_64/evmcs.h | 45 +++-
.../selftests/kvm/include/x86_64/vmx.h | 2 +
.../testing/selftests/kvm/x86_64/evmcs_test.c | 31 ++-
14 files changed, 477 insertions(+), 221 deletions(-)

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2.35.3