KVM: selftests: Verify single-stepping a fastpath VM-Exit exits to userspace

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In x86's debug_regs test, change the RDMSR(MISC_ENABLES) in the single-step
testcase to a WRMSR(TSC_DEADLINE) in order to verify that KVM honors
KVM_GUESTDBG_SINGLESTEP when handling a fastpath VM-Exit.

Note, the extra coverage is effectively Intel-only, as KVM only handles
TSC_DEADLINE in the fastpath when the timer is emulated via the hypervisor
timer, a.k.a. the VMX preemption timer.

Link: https://lore.kernel.org/r/20240830044448.130449-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Sean Christopherson 2024-08-29 21:44:48 -07:00

parent 9d15171f39

commit c32e028057

1 changed files with 7 additions and 4 deletions

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

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