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[v2,23/36] KVM: arm64: Prepare to handle traps on deferred EL0 sysregs

Message ID 20171207170630.592-24-christoffer.dall@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Christoffer Dall Dec. 7, 2017, 5:06 p.m. UTC 
We can trap access to ACTLR_EL1 which we can later defer to only
save/restore during vcpu_load and vcpu_put, so let's read the value
directly from the CPU when necessary.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---

Notes:
    Changes since v1:
     - Fix bug in access_actlr that read the actlr_el1 and threw away the
       value.  Whoops.

 arch/arm64/kvm/sys_regs_generic_v8.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/arm64/kvm/sys_regs_generic_v8.c b/arch/arm64/kvm/sys_regs_generic_v8.c
index 969ade1d333d..8df4b4301696 100644
--- a/arch/arm64/kvm/sys_regs_generic_v8.c
+++ b/arch/arm64/kvm/sys_regs_generic_v8.c
@@ -38,7 +38,10 @@  static bool access_actlr(struct kvm_vcpu *vcpu,
 	if (p->is_write)
 		return ignore_write(vcpu, p);
 
-	p->regval = vcpu_sys_reg(vcpu, ACTLR_EL1);
+	if (vcpu->arch.sysregs_loaded_on_cpu)
+		p->regval = read_sysreg(actlr_el1);
+	else
+		p->regval = vcpu_sys_reg(vcpu, ACTLR_EL1);
 	return true;
 }