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SubjectRe: [PATCH] KVM: X86: Also reload the debug registers before kvm_x86->run() when the host is using them
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On 09/07/21 18:35, Jim Mattson wrote:
>>>> Just what you said, it's not easy and the needs are limited. I
>>>> implemented kvm_vcpu_check_breakpoint because I was interested in
>>>> using hardware breakpoints from gdb, even with unrestricted_guest=0
>>>> and invalid guest state, but that's it.
>>> It seems kvm_vcpu_check_breakpoint() handles only for code breakpoint
>>> and doesn't handle for data breakpoints.
>> Correct, there's a comment above the call. But data breakpoint are much
>> harder and relatively less useful.
>
> Data breakpoints are actually quite useful. I/O breakpoints not so much.

Normally yes; much less for the specific case of debugging
invalid-guest-state or other invocations of the emulator.

Paolo

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