KVM: arm64: Move debug dirty flag calculation out of world switch

There is no need to figure out inside the world-switch if we should
save/restore the debug registers or not, we might as well do that in the
higher level debug setup code, making it easier to optimize down the
line.

Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c
index fa63b28..feedb87 100644 (file)
--- a/arch/arm64/kvm/debug.c
+++ b/arch/arm64/kvm/debug.c
@@ -193,6 +193,11 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu)
        if (trap_debug)
                vcpu->arch.mdcr_el2 |= MDCR_EL2_TDA;
 
+       /* If KDE or MDE are set, perform a full save/restore cycle. */
+       if ((vcpu_sys_reg(vcpu, MDSCR_EL1) & DBG_MDSCR_KDE) ||
+           (vcpu_sys_reg(vcpu, MDSCR_EL1) & DBG_MDSCR_MDE))
+               vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY;
+
        trace_kvm_arm_set_dreg32("MDCR_EL2", vcpu->arch.mdcr_el2);
        trace_kvm_arm_set_dreg32("MDSCR_EL1", vcpu_sys_reg(vcpu, MDSCR_EL1));
 }

diff --git a/arch/arm64/kvm/hyp/debug-sr.c b/arch/arm64/kvm/hyp/debug-sr.c
index dabb5cc..d958cd6 100644 (file)
--- a/arch/arm64/kvm/hyp/debug-sr.c
+++ b/arch/arm64/kvm/hyp/debug-sr.c
@@ -166,12 +166,6 @@ void __hyp_text __debug_restore_state(struct kvm_vcpu *vcpu,
 
 void __hyp_text __debug_cond_save_host_state(struct kvm_vcpu *vcpu)
 {
-       /* If any of KDE, MDE or KVM_ARM64_DEBUG_DIRTY is set, perform
-        * a full save/restore cycle. */
-       if ((vcpu->arch.ctxt.sys_regs[MDSCR_EL1] & DBG_MDSCR_KDE) ||
-           (vcpu->arch.ctxt.sys_regs[MDSCR_EL1] & DBG_MDSCR_MDE))
-               vcpu->arch.debug_flags |= KVM_ARM64_DEBUG_DIRTY;
-
        __debug_save_state(vcpu, &vcpu->arch.host_debug_state.regs,
                           kern_hyp_va(vcpu->arch.host_cpu_context));
        __debug_save_spe()(&vcpu->arch.host_debug_state.pmscr_el1);