In protected mode, late CPUs are not allowed to boot (enforced by
the PSCI relay). We can thus specialise the read_ctr macro to
always return a pre-computed, sanitised value.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/include/asm/assembler.h | 9 +++++++++
arch/arm64/kernel/image-vars.h | 1 +
arch/arm64/kvm/va_layout.c | 7 +++++++
3 files changed, 17 insertions(+)
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index fb651c1f26e9..1a4cee7eb3c9 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -270,12 +270,21 @@ alternative_endif
* provide the system wide safe value from arm64_ftr_reg_ctrel0.sys_val
*/
.macro read_ctr, reg
+#ifndef __KVM_NVHE_HYPERVISOR__
alternative_if_not ARM64_MISMATCHED_CACHE_TYPE
mrs \reg, ctr_el0 // read CTR
nop
alternative_else
ldr_l \reg, arm64_ftr_reg_ctrel0 + ARM64_FTR_SYSVAL
alternative_endif
+#else
+alternative_cb kvm_compute_final_ctr_el0
+ movz \reg, #0
+ movk \reg, #0, lsl #16
+ movk \reg, #0, lsl #32
+ movk \reg, #0, lsl #48
+alternative_cb_end
+#endif
.endm
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index d5dc2b792651..fdd60cd1d7e8 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -65,6 +65,7 @@ __efistub__ctype = _ctype;
KVM_NVHE_ALIAS(kvm_patch_vector_branch);
KVM_NVHE_ALIAS(kvm_update_va_mask);
KVM_NVHE_ALIAS(kvm_get_kimage_voffset);
+KVM_NVHE_ALIAS(kvm_compute_final_ctr_el0);
/* Global kernel state accessed by nVHE hyp code. */
KVM_NVHE_ALIAS(kvm_vgic_global_state);
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index 978301392d67..acdb7b3cc97d 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -288,3 +288,10 @@ void kvm_get_kimage_voffset(struct alt_instr *alt,
{
generate_mov_q(kimage_voffset, origptr, updptr, nr_inst);
}
+
+void kvm_compute_final_ctr_el0(struct alt_instr *alt,
+ __le32 *origptr, __le32 *updptr, int nr_inst)
+{
+ generate_mov_q(read_sanitised_ftr_reg(SYS_CTR_EL0),
+ origptr, updptr, nr_inst);
+}
--
2.29.2
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