From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: [PATCH 2/4] KVM: x86: change vcpu->arch.switch_db_regs to a bit mask Date: Wed, 26 Feb 2014 16:49:11 +0100 Message-ID: <1393429753-20857-3-git-send-email-pbonzini@redhat.com> References: <1393429753-20857-1-git-send-email-pbonzini@redhat.com> Cc: kvm@vger.kernel.org, alex.williamson@redhat.com, mtosatti@redhat.com, gleb@kernel.org, jan.kiszka@siemens.com To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <1393429753-20857-1-git-send-email-pbonzini@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org The next patch will add another bit that we can test with the same "if". Signed-off-by: Paolo Bonzini --- arch/x86/include/asm/kvm_host.h | 6 +++++- arch/x86/kvm/x86.c | 6 ++++-- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index e714f8c08ccf..6b3b067f4780 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -337,6 +337,10 @@ struct kvm_pmu { u64 reprogram_pmi; }; +enum { + KVM_DEBUGREG_BP_ENABLED = 1, +}; + struct kvm_vcpu_arch { /* * rip and regs accesses must go through @@ -463,7 +467,7 @@ struct kvm_vcpu_arch { struct mtrr_state_type mtrr_state; u32 pat; - int switch_db_regs; + unsigned switch_db_regs; unsigned long db[KVM_NR_DB_REGS]; unsigned long dr6; unsigned long dr7; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 109985016389..c01dddce6df0 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -759,7 +759,9 @@ static void kvm_update_dr7(struct kvm_vcpu *vcpu) else dr7 = vcpu->arch.dr7; kvm_x86_ops->set_dr7(vcpu, dr7); - vcpu->arch.switch_db_regs = (dr7 & DR7_BP_EN_MASK); + vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_BP_ENABLED; + if (dr7 & DR7_BP_EN_MASK) + vcpu->arch.switch_db_regs |= KVM_DEBUGREG_BP_ENABLED; } static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) -- 1.8.3.1