write_sysreg(read_sysreg(tpidr_el1), tpidr_el2);
}
+static bool has_nested_virt_support(const struct arm64_cpu_capabilities *cap,
+ int scope)
+{
+ if (kvm_get_mode() != KVM_MODE_NV)
+ return false;
+
+ if (!has_cpuid_feature(cap, scope)) {
+ pr_warn("unavailable: %s\n", cap->desc);
+ return false;
+ }
+
+ return true;
+}
+
#ifdef CONFIG_ARM64_PAN
static void cpu_enable_pan(const struct arm64_cpu_capabilities *__unused)
{
.matches = runs_at_el2,
.cpu_enable = cpu_copy_el2regs,
},
+ {
+ .desc = "Nested Virtualization Support",
+ .capability = ARM64_HAS_NESTED_VIRT,
+ .type = ARM64_CPUCAP_SYSTEM_FEATURE,
+ .matches = has_nested_virt_support,
+ .sys_reg = SYS_ID_AA64MMFR2_EL1,
+ .sign = FTR_UNSIGNED,
+ .field_pos = ID_AA64MMFR2_EL1_NV_SHIFT,
+ .field_width = 4,
+ .min_field_value = ID_AA64MMFR2_EL1_NV_IMP,
+ },
{
.capability = ARM64_HAS_32BIT_EL0_DO_NOT_USE,
.type = ARM64_CPUCAP_SYSTEM_FEATURE,