linux-kernel - Re: [RFC PATCH 1/3] kvm: x86: Rename KVM_DEBUGREG_RELOAD to KVM_DEBUGREG_NEED

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Date:   Sat, 25 Apr 2020 09:48:17 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Peter Xu <peterx@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Xiaoyao Li <xiaoyao.li@...el.com>, kvm@...r.kernel.org,
        Nadav Amit <namit@...technion.ac.il>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/3] kvm: x86: Rename KVM_DEBUGREG_RELOAD to
 KVM_DEBUGREG_NEED_RELOAD

On 24/04/20 22:21, Peter Xu wrote:
> But then shouldn't DIRTY be set as long as KVM_DEBUGREG_BP_ENABLED is set every
> time before vmenter?  Then it'll somehow go back to switch_db_regs, iiuc...
> 
> IIUC RELOAD actually wants to say "reload only for this iteration", that's why
> it's cleared after each reload.  So maybe...  RELOAD_ONCE?
> 
> (Btw, do we have debug regs tests somewhere no matter inside guest or with
>  KVM_SET_GUEST_DEBUG?)

What about KVM_DEBUGREG_EFF_DB_DIRTY?

We have them in kvm-unit-tests for debug regs inside the guest, but no
selftests covering KVM_SET_GUEST_DEBUG.

Paolo