On handling a debug trap, check whether we need to forward it to the
guest before handling it.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/include/asm/kvm_nested.h | 2 ++
arch/arm64/kvm/emulate-nested.c | 9 +++++++--
arch/arm64/kvm/sys_regs.c | 5 +++++
3 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h
index 4b7f9f35ece9..f2820c82e956 100644
--- a/arch/arm64/include/asm/kvm_nested.h
+++ b/arch/arm64/include/asm/kvm_nested.h
@@ -59,6 +59,8 @@ static inline u64 translate_ttbr0_el2_to_ttbr0_el1(u64 ttbr0)
return ttbr0 & ~GENMASK_ULL(63, 48);
}
+extern bool __forward_traps(struct kvm_vcpu *vcpu, unsigned int reg,
+ u64 control_bit);
extern bool forward_traps(struct kvm_vcpu *vcpu, u64 control_bit);
extern bool forward_nv_traps(struct kvm_vcpu *vcpu);
extern bool forward_nv1_traps(struct kvm_vcpu *vcpu);
diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c
index 7c06844a5113..555771e1260d 100644
--- a/arch/arm64/kvm/emulate-nested.c
+++ b/arch/arm64/kvm/emulate-nested.c
@@ -14,14 +14,14 @@
#include "trace.h"
-bool forward_traps(struct kvm_vcpu *vcpu, u64 control_bit)
+bool __forward_traps(struct kvm_vcpu *vcpu, unsigned int reg, u64 control_bit)
{
bool control_bit_set;
if (!vcpu_has_nv(vcpu))
return false;
- control_bit_set = __vcpu_sys_reg(vcpu, HCR_EL2) & control_bit;
+ control_bit_set = __vcpu_sys_reg(vcpu, reg) & control_bit;
if (!vcpu_is_el2(vcpu) && control_bit_set) {
kvm_inject_nested_sync(vcpu, kvm_vcpu_get_esr(vcpu));
return true;
@@ -29,6 +29,11 @@ bool forward_traps(struct kvm_vcpu *vcpu, u64 control_bit)
return false;
}
+bool forward_traps(struct kvm_vcpu *vcpu, u64 control_bit)
+{
+ return __forward_traps(vcpu, HCR_EL2, control_bit);
+}
+
bool forward_nv_traps(struct kvm_vcpu *vcpu)
{
return forward_traps(vcpu, HCR_NV);
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index d40e5181bf74..548f637e57ac 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -666,6 +666,11 @@ static bool trap_debug_regs(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
+ if (forward_traps(vcpu, HCR_TGE) ||
+ __forward_traps(vcpu, MDCR_EL2, MDCR_EL2_TDE) ||
+ __forward_traps(vcpu, MDCR_EL2, MDCR_EL2_TDA))
+ return false;
+
access_rw(vcpu, p, r);
if (p->is_write)
vcpu_set_flag(vcpu, DEBUG_DIRTY);
--
2.34.1
