xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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>
This commit is contained in:
Christoffer Dall
2017-10-10 19:31:33 +02:00
committed by Marc Zyngier
parent e72341c512
commit 54ceb1bcf8
2 changed files with 5 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/arm64/kvm/debug.c
View File

@@ -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));
}