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Message-Id: <20220525090133.1264239-1-vkuznets@redhat.com>
Date: Wed, 25 May 2022 11:00:56 +0200
From: Vitaly Kuznetsov <vkuznets@...hat.com>
To: kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>,
Maxim Levitsky <mlevitsk@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Michael Kelley <mikelley@...rosoft.com>,
Siddharth Chandrasekaran <sidcha@...zon.de>,
linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 00/37] KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush features
Main changes since v3:
- Rebase to the latest kvm/queue.
- Use 'kfifo' instead of a homegrown ring structure. [Max]
- TLB flush selftest rework, swap PTE from the main vCPU instead of
exiting to the host to do so [Max]. Some APIs were exported to
support the change.
- Reuse some common functions in selftests [Max]
- Statistics: increment vcpu->stat.tlb_flush for each fifo entry
instead of each flushed GVA [inspired by Sean]
- A number of comments added/altered [Max, Sean]
- Other minor tweaks.
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 (1):
KVM: x86: hyper-v: Add helper to read hypercall data for array
Vitaly Kuznetsov (36):
KVM: x86: Rename 'enable_direct_tlbflush' to 'enable_l2_tlb_flush'
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
x86/hyperv: Fix 'struct hv_enlightened_vmcs' definition
KVM: nVMX: hyper-v: Enable L2 TLB flush
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: Export _vm_get_page_table_entry() and struct
pageTableEntry/pageUpperEntry definitions
KVM: selftests: Hyper-V PV TLB flush selftest
KVM: selftests: Sync 'struct hv_enlightened_vmcs' definition with
hyperv-tlfs.h
KVM: selftests: nVMX: Allocate Hyper-V partition assist page
KVM: selftests: nSVM: Allocate Hyper-V partition assist and VP assist
pages
KVM: selftests: Sync 'struct hv_vp_assist_page' definition with
hyperv-tlfs.h
KVM: selftests: evmcs_test: Introduce L2 TLB flush test
KVM: selftests: Move Hyper-V VP assist page enablement out of evmcs.h
KVM: selftests: hyperv_svm_test: Introduce L2 TLB flush test
arch/x86/include/asm/hyperv-tlfs.h | 6 +-
arch/x86/include/asm/kvm-x86-ops.h | 2 +-
arch/x86/include/asm/kvm_host.h | 41 +-
arch/x86/kvm/Makefile | 3 +-
arch/x86/kvm/hyperv.c | 324 +++++++--
arch/x86/kvm/hyperv.h | 49 ++
arch/x86/kvm/svm/hyperv.c | 18 +
arch/x86/kvm/svm/hyperv.h | 37 +
arch/x86/kvm/svm/nested.c | 30 +-
arch/x86/kvm/svm/svm_onhyperv.c | 2 +-
arch/x86/kvm/svm/svm_onhyperv.h | 6 +-
arch/x86/kvm/trace.h | 21 +-
arch/x86/kvm/vmx/evmcs.c | 24 +
arch/x86/kvm/vmx/evmcs.h | 11 +
arch/x86/kvm/vmx/nested.c | 32 +
arch/x86/kvm/vmx/vmx.c | 6 +-
arch/x86/kvm/x86.c | 19 +-
arch/x86/kvm/x86.h | 1 +
include/asm-generic/hyperv-tlfs.h | 5 +
include/asm-generic/mshyperv.h | 11 +-
tools/testing/selftests/kvm/.gitignore | 2 +
tools/testing/selftests/kvm/Makefile | 4 +-
.../selftests/kvm/include/kvm_util_base.h | 1 +
.../selftests/kvm/include/x86_64/evmcs.h | 40 +-
.../selftests/kvm/include/x86_64/hyperv.h | 62 ++
.../selftests/kvm/include/x86_64/processor.h | 104 ++-
.../selftests/kvm/include/x86_64/svm_util.h | 10 +
.../selftests/kvm/include/x86_64/vmx.h | 4 +
tools/testing/selftests/kvm/lib/kvm_util.c | 7 +-
.../testing/selftests/kvm/lib/x86_64/hyperv.c | 21 +
.../selftests/kvm/lib/x86_64/processor.c | 36 +-
tools/testing/selftests/kvm/lib/x86_64/svm.c | 10 +
tools/testing/selftests/kvm/lib/x86_64/vmx.c | 7 +
.../testing/selftests/kvm/x86_64/evmcs_test.c | 43 +-
.../selftests/kvm/x86_64/hyperv_features.c | 22 +-
.../testing/selftests/kvm/x86_64/hyperv_ipi.c | 352 ++++++++++
.../selftests/kvm/x86_64/hyperv_svm_test.c | 54 +-
.../selftests/kvm/x86_64/hyperv_tlb_flush.c | 663 ++++++++++++++++++
38 files changed, 1881 insertions(+), 209 deletions(-)
create mode 100644 arch/x86/kvm/svm/hyperv.c
create mode 100644 tools/testing/selftests/kvm/lib/x86_64/hyperv.c
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
--
2.35.3
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