Describe the CNTHCTL_EL2 register, and associate it with all the sysregs
it allows to trap.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/kvm/emulate-nested.c | 37 ++++++++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c
index 1e2fe192c9a4..101292c43602 100644
--- a/arch/arm64/kvm/emulate-nested.c
+++ b/arch/arm64/kvm/emulate-nested.c
@@ -98,9 +98,11 @@ enum coarse_grain_trap_id {
/*
* Anything after this point requires a callback evaluating a
- * complex trap condition. Hopefully we'll never need this...
+ * complex trap condition. Ugly stuff.
*/
__COMPLEX_CONDITIONS__,
+ CGT_CNTHCTL_EL1PCTEN = __COMPLEX_CONDITIONS__,
+ CGT_CNTHCTL_EL1PTEN,
};
static const struct trap_bits coarse_trap_bits[] = {
@@ -358,9 +360,37 @@ static const enum coarse_grain_trap_id *coarse_control_combo[] = {
typedef enum trap_behaviour (*complex_condition_check)(struct kvm_vcpu *);
+static u64 get_sanitized_cnthctl(struct kvm_vcpu *vcpu)
+{
+ u64 val = __vcpu_sys_reg(vcpu, CNTHCTL_EL2);
+
+ if (!vcpu_el2_e2h_is_set(vcpu))
+ val = (val & (CNTHCTL_EL1PCEN | CNTHCTL_EL1PCTEN)) << 10;
+
+ return val;
+}
+
+static enum trap_behaviour check_cnthctl_el1pcten(struct kvm_vcpu *vcpu)
+{
+ if (get_sanitized_cnthctl(vcpu) & (CNTHCTL_EL1PCTEN << 10))
+ return BEHAVE_HANDLE_LOCALLY;
+
+ return BEHAVE_FORWARD_ANY;
+}
+
+static enum trap_behaviour check_cnthctl_el1pten(struct kvm_vcpu *vcpu)
+{
+ if (get_sanitized_cnthctl(vcpu) & (CNTHCTL_EL1PCEN << 10))
+ return BEHAVE_HANDLE_LOCALLY;
+
+ return BEHAVE_FORWARD_ANY;
+}
+
#define CCC(id, fn) [id - __COMPLEX_CONDITIONS__] = fn
static const complex_condition_check ccc[] = {
+ CCC(CGT_CNTHCTL_EL1PCTEN, check_cnthctl_el1pcten),
+ CCC(CGT_CNTHCTL_EL1PTEN, check_cnthctl_el1pten),
};
struct encoding_to_trap_configs {
@@ -769,6 +799,11 @@ static const struct encoding_to_trap_configs encoding_to_traps[] __initdata = {
SR_TRAP(SYS_TRBPTR_EL1, CGT_MDCR_E2TB),
SR_TRAP(SYS_TRBSR_EL1, CGT_MDCR_E2TB),
SR_TRAP(SYS_TRBTRG_EL1, CGT_MDCR_E2TB),
+ SR_TRAP(SYS_CNTP_TVAL_EL0, CGT_CNTHCTL_EL1PTEN),
+ SR_TRAP(SYS_CNTP_CVAL_EL0, CGT_CNTHCTL_EL1PTEN),
+ SR_TRAP(SYS_CNTP_CTL_EL0, CGT_CNTHCTL_EL1PTEN),
+ SR_TRAP(SYS_CNTPCT_EL0, CGT_CNTHCTL_EL1PCTEN),
+ SR_TRAP(SYS_CNTPCTSS_EL0, CGT_CNTHCTL_EL1PCTEN),
};
static DEFINE_XARRAY(sr_forward_xa);
--
2.34.1
