Commit 9e7726a8 authored Nov 01, 2022 by Vitaly Kuznetsov Committed by Paolo Bonzini Nov 21, 2022

KVM: selftests: Hyper-V PV TLB flush selftest



Introduce a selftest for Hyper-V PV TLB flush hypercalls
(HvFlushVirtualAddressSpace/HvFlushVirtualAddressSpaceEx,
HvFlushVirtualAddressList/HvFlushVirtualAddressListEx).

The test creates one 'sender' vCPU and two 'worker' vCPU which do busy
loop reading from a certain GVA checking the observed value. Sender
vCPU swaos the data page with another page filled with a different value.
The expectation for workers is also altered. Without TLB flush on worker
vCPUs, they may continue to observe old value. To guard against accidental
TLB flushes for worker vCPUs the test is repeated 100 times.

Hyper-V TLB flush hypercalls are tested in both 'normal' and 'XMM
fast' modes.

Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-38-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 2d4a5f91

tools/testing/selftests/kvm/.gitignore

+1 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,7 @@
		/x86_64/hyperv_features
		/x86_64/hyperv_ipi
		/x86_64/hyperv_svm_test
		/x86_64/hyperv_tlb_flush
		/x86_64/max_vcpuid_cap_test
		/x86_64/mmio_warning_test
		/x86_64/monitor_mwait_test

tools/testing/selftests/kvm/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -89,6 +89,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
		TEST_GEN_PROGS_x86_64 += x86_64/hyperv_features
		TEST_GEN_PROGS_x86_64 += x86_64/hyperv_ipi
		TEST_GEN_PROGS_x86_64 += x86_64/hyperv_svm_test
		TEST_GEN_PROGS_x86_64 += x86_64/hyperv_tlb_flush
		TEST_GEN_PROGS_x86_64 += x86_64/kvm_clock_test
		TEST_GEN_PROGS_x86_64 += x86_64/kvm_pv_test
		TEST_GEN_PROGS_x86_64 += x86_64/mmio_warning_test

tools/testing/selftests/kvm/include/x86_64/hyperv.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -187,6 +187,7 @@
		/* hypercall options */
		#define HV_HYPERCALL_FAST_BIT BIT(16)
		#define HV_HYPERCALL_VARHEAD_OFFSET 17
		#define HV_HYPERCALL_REP_COMP_OFFSET 32

		/*
		* Issue a Hyper-V hypercall. Returns exception vector raised or 0, 'hv_status'

tools/testing/selftests/kvm/x86_64/hyperv_tlb_flush.c

0 → 100644

+690 −0

File added.

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