[PATCH v11 00/46] KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush features

Vitaly Kuznetsov
2022-10-04T12:40:13Z

Changes since v10 (Sean):
- New patches added:
- "x86/hyperv: Move VMCB enlightenment definitions to hyperv-tlfs.h"
- "KVM: selftests: Move "struct hv_enlightenments" to x86_64/svm.h"
- "KVM: SVM: Add a proper field for Hyper-V VMCB enlightenments"
- 'x86/hyperv: KVM: Rename "hv_enlightenments" to "hv_vmcb_enlightenments"'
- 'KVM: VMX: Rename "vmx/evmcs.{ch}" to "vmx/hyperv.{ch}"'
- "KVM: x86: Move clearing of TLB_FLUSH_CURRENT to kvm_vcpu_flush_tlb_all()"
- "KVM: selftests: Drop helpers to read/write page table entries"
- "KVM: x86: Make kvm_hv_get_assist_page() return 0/-errno"
- Removed patches:
- "KVM: selftests: Export _vm_get_page_table_entry()"
- Main differences:
- Move Hyper-V TLB flushing out of kvm_service_local_tlb_flush_requests().
On SVM, Hyper-V TLB flush FIFO is emptied from svm_flush_tlb_current()
- Don't disable IRQs in hv_tlb_flush_enqueue().
- Don't call kvm_vcpu_flush_tlb_guest() from kvm_hv_vcpu_flush_tlb() but
return -errno instead.
- Avoid unneded flushes in !EPT/!NPT cases.
- Optimize hv_is_vp_in_sparse_set().
- Move TLFS definitions to asm/hyperv-tlfs.h.
- Use u64 vals in Hyper-V PV TLB flush selftest + multiple smaler changes
- Typos, indentation, renames, ...

Original description:

Currently, KVM handles HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST{,EX} requests
by flushing the whole VPID and this is sub-optimal. This series introduces
the required mechanism to make handling of these requests more
fine-grained by flushing individual GVAs only (when requested). On this
foundation, "Direct Virtual Flush" Hyper-V feature is implemented. The
feature allows L0 to handle Hyper-V TLB flush hypercalls directly at
L0 without the need to reflect the exit to L1. This has at least two
benefits: reflecting vmexit and the consequent vmenter are avoided + L0
has precise information whether the target vCPU is actually running (and
thus requires a kick).

Sean Christopherson (7):
x86/hyperv: Move VMCB enlightenment definitions to hyperv-tlfs.h
KVM: selftests: Move "struct hv_enlightenments" to x86_64/svm.h
KVM: SVM: Add a proper field for Hyper-V VMCB enlightenments
x86/hyperv: KVM: Rename "hv_enlightenments" to
"hv_vmcb_enlightenments"
KVM: x86: Move clearing of TLB_FLUSH_CURRENT to
kvm_vcpu_flush_tlb_all()
KVM: x86: hyper-v: Add helper to read hypercall data for array
KVM: selftests: Drop helpers to read/write page table entries

Vitaly Kuznetsov (39):
KVM: x86: Rename 'enable_direct_tlbflush' to 'enable_l2_tlb_flush'
KVM: VMX: Rename "vmx/evmcs.{ch}" to "vmx/hyperv.{ch}"
KVM: x86: hyper-v: Resurrect dedicated KVM_REQ_HV_TLB_FLUSH flag
KVM: x86: hyper-v: Introduce TLB flush fifo
KVM: x86: hyper-v: Handle HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST{,EX} calls
gently
KVM: x86: hyper-v: Expose support for extended gva ranges for flush
hypercalls
KVM: x86: Prepare kvm_hv_flush_tlb() to handle L2's GPAs
x86/hyperv: Introduce
HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK constants
KVM: x86: hyper-v: Use
HV_MAX_SPARSE_VCPU_BANKS/HV_VCPUS_PER_SPARSE_BANK instead of raw
'64'
KVM: x86: hyper-v: Don't use sparse_set_to_vcpu_mask() in
kvm_hv_send_ipi()
KVM: x86: hyper-v: Create a separate fifo for L2 TLB flush
KVM: x86: hyper-v: Use preallocated buffer in 'struct kvm_vcpu_hv'
instead of on-stack 'sparse_banks'
KVM: nVMX: Keep track of hv_vm_id/hv_vp_id when eVMCS is in use
KVM: nSVM: Keep track of Hyper-V hv_vm_id/hv_vp_id
KVM: x86: Introduce .hv_inject_synthetic_vmexit_post_tlb_flush()
nested hook
KVM: x86: hyper-v: Introduce kvm_hv_is_tlb_flush_hcall()
KVM: x86: hyper-v: L2 TLB flush
KVM: x86: hyper-v: Introduce fast guest_hv_cpuid_has_l2_tlb_flush()
check
KVM: nVMX: hyper-v: Cache VP assist page in 'struct kvm_vcpu_hv'
KVM: nVMX: hyper-v: Enable L2 TLB flush
KVM: x86: Make kvm_hv_get_assist_page() return 0/-errno
KVM: nSVM: hyper-v: Enable L2 TLB flush
KVM: x86: Expose Hyper-V L2 TLB flush feature
KVM: selftests: Better XMM read/write helpers
KVM: selftests: Move HYPERV_LINUX_OS_ID definition to a common header
KVM: selftests: Move the function doing Hyper-V hypercall to a common
header
KVM: selftests: Hyper-V PV IPI selftest
KVM: selftests: Fill in vm->vpages_mapped bitmap in virt_map() too
KVM: selftests: Export vm_vaddr_unused_gap() to make it possible to
request unmapped ranges
KVM: selftests: Hyper-V PV TLB flush selftest
KVM: selftests: Sync 'struct hv_enlightened_vmcs' definition with
hyperv-tlfs.h
KVM: selftests: Sync 'struct hv_vp_assist_page' definition with
hyperv-tlfs.h
KVM: selftests: Move Hyper-V VP assist page enablement out of evmcs.h
KVM: selftests: Split off load_evmcs() from load_vmcs()
KVM: selftests: Create a vendor independent helper to allocate Hyper-V
specific test pages
KVM: selftests: Allocate Hyper-V partition assist page
KVM: selftests: evmcs_test: Introduce L2 TLB flush test
KVM: selftests: hyperv_svm_test: Introduce L2 TLB flush test
KVM: selftests: Rename 'evmcs_test' to 'hyperv_evmcs'

arch/x86/include/asm/hyperv-tlfs.h | 37 +
arch/x86/include/asm/kvm-x86-ops.h | 2 +-
arch/x86/include/asm/kvm_host.h | 42 +-
arch/x86/include/asm/svm.h | 7 +-
arch/x86/kvm/Makefile | 5 +-
arch/x86/kvm/hyperv.c | 335 +++++++--
arch/x86/kvm/hyperv.h | 64 +-
arch/x86/kvm/svm/hyperv.c | 18 +
arch/x86/kvm/svm/hyperv.h | 50 +-
arch/x86/kvm/svm/nested.c | 49 +-
arch/x86/kvm/svm/svm.c | 7 +
arch/x86/kvm/svm/svm.h | 5 +-
arch/x86/kvm/svm/svm_onhyperv.c | 8 +-
arch/x86/kvm/svm/svm_onhyperv.h | 25 +-
arch/x86/kvm/trace.h | 21 +-
arch/x86/kvm/vmx/{evmcs.c => hyperv.c} | 45 +-
arch/x86/kvm/vmx/{evmcs.h => hyperv.h} | 12 +-
arch/x86/kvm/vmx/nested.c | 43 +-
arch/x86/kvm/vmx/vmx.c | 7 +-
arch/x86/kvm/vmx/vmx_ops.h | 2 +-
arch/x86/kvm/x86.c | 38 +-
arch/x86/kvm/x86.h | 1 +
include/asm-generic/hyperv-tlfs.h | 5 +
include/asm-generic/mshyperv.h | 11 +-
tools/testing/selftests/kvm/.gitignore | 4 +-
tools/testing/selftests/kvm/Makefile | 5 +-
.../selftests/kvm/include/kvm_util_base.h | 1 +
.../selftests/kvm/include/x86_64/evmcs.h | 48 +-
.../selftests/kvm/include/x86_64/hyperv.h | 102 +++
.../selftests/kvm/include/x86_64/processor.h | 76 +-
.../selftests/kvm/include/x86_64/svm.h | 26 +-
.../selftests/kvm/include/x86_64/vmx.h | 8 -
tools/testing/selftests/kvm/lib/kvm_util.c | 9 +-
.../testing/selftests/kvm/lib/x86_64/hyperv.c | 46 ++
.../selftests/kvm/lib/x86_64/processor.c | 21 +-
tools/testing/selftests/kvm/lib/x86_64/vmx.c | 45 +-
.../kvm/x86_64/emulator_error_test.c | 6 +-
.../x86_64/{evmcs_test.c => hyperv_evmcs.c} | 69 +-
.../selftests/kvm/x86_64/hyperv_features.c | 25 +-
.../testing/selftests/kvm/x86_64/hyperv_ipi.c | 330 +++++++++
.../selftests/kvm/x86_64/hyperv_svm_test.c | 86 ++-
.../selftests/kvm/x86_64/hyperv_tlb_flush.c | 689 ++++++++++++++++++
42 files changed, 2081 insertions(+), 354 deletions(-)
create mode 100644 arch/x86/kvm/svm/hyperv.c
rename arch/x86/kvm/vmx/{evmcs.c => hyperv.c} (95%)
rename arch/x86/kvm/vmx/{evmcs.h => hyperv.h} (95%)
create mode 100644 tools/testing/selftests/kvm/lib/x86_64/hyperv.c
rename tools/testing/selftests/kvm/x86_64/{evmcs_test.c => hyperv_evmcs.c} (73%)
create mode 100644 tools/testing/selftests/kvm/x86_64/hyperv_ipi.c
create mode 100644 tools/testing/selftests/kvm/x86_64/hyperv_tlb_flush.c

--
2.37.3