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Diffstat (limited to 'arch/arm64/kvm/hyp/debug-sr.c')
-rw-r--r--arch/arm64/kvm/hyp/debug-sr.c66
1 files changed, 64 insertions, 2 deletions
diff --git a/arch/arm64/kvm/hyp/debug-sr.c b/arch/arm64/kvm/hyp/debug-sr.c
index 4ba5c9095d03..f5154ed3da6c 100644
--- a/arch/arm64/kvm/hyp/debug-sr.c
+++ b/arch/arm64/kvm/hyp/debug-sr.c
@@ -65,6 +65,66 @@
default: write_debug(ptr[0], reg, 0); \
}
+#define PMSCR_EL1 sys_reg(3, 0, 9, 9, 0)
+
+#define PMBLIMITR_EL1 sys_reg(3, 0, 9, 10, 0)
+#define PMBLIMITR_EL1_E BIT(0)
+
+#define PMBIDR_EL1 sys_reg(3, 0, 9, 10, 7)
+#define PMBIDR_EL1_P BIT(4)
+
+#define psb_csync() asm volatile("hint #17")
+
+static void __hyp_text __debug_save_spe_vhe(u64 *pmscr_el1)
+{
+ /* The vcpu can run. but it can't hide. */
+}
+
+static void __hyp_text __debug_save_spe_nvhe(u64 *pmscr_el1)
+{
+ u64 reg;
+
+ /* SPE present on this CPU? */
+ if (!cpuid_feature_extract_unsigned_field(read_sysreg(id_aa64dfr0_el1),
+ ID_AA64DFR0_PMSVER_SHIFT))
+ return;
+
+ /* Yes; is it owned by EL3? */
+ reg = read_sysreg_s(PMBIDR_EL1);
+ if (reg & PMBIDR_EL1_P)
+ return;
+
+ /* No; is the host actually using the thing? */
+ reg = read_sysreg_s(PMBLIMITR_EL1);
+ if (!(reg & PMBLIMITR_EL1_E))
+ return;
+
+ /* Yes; save the control register and disable data generation */
+ *pmscr_el1 = read_sysreg_s(PMSCR_EL1);
+ write_sysreg_s(0, PMSCR_EL1);
+ isb();
+
+ /* Now drain all buffered data to memory */
+ psb_csync();
+ dsb(nsh);
+}
+
+static hyp_alternate_select(__debug_save_spe,
+ __debug_save_spe_nvhe, __debug_save_spe_vhe,
+ ARM64_HAS_VIRT_HOST_EXTN);
+
+static void __hyp_text __debug_restore_spe(u64 pmscr_el1)
+{
+ if (!pmscr_el1)
+ return;
+
+ /* The host page table is installed, but not yet synchronised */
+ isb();
+
+ /* Re-enable data generation */
+ write_sysreg_s(pmscr_el1, PMSCR_EL1);
+}
+
void __hyp_text __debug_save_state(struct kvm_vcpu *vcpu,
struct kvm_guest_debug_arch *dbg,
struct kvm_cpu_context *ctxt)
@@ -118,13 +178,15 @@ void __hyp_text __debug_cond_save_host_state(struct kvm_vcpu *vcpu)
(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,
+ __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);
}
void __hyp_text __debug_cond_restore_host_state(struct kvm_vcpu *vcpu)
{
- __debug_restore_state(vcpu, &vcpu->arch.host_debug_state,
+ __debug_restore_spe(vcpu->arch.host_debug_state.pmscr_el1);
+ __debug_restore_state(vcpu, &vcpu->arch.host_debug_state.regs,
kern_hyp_va(vcpu->arch.host_cpu_context));
if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)