KVM: arm64: selftests: Test writes to ID_AA64MMFR1_EL1.{HCX, TWED}

Assert that the EL2 features {HCX, TWED} of ID_AA64MMFR1_EL1 are writable
from userspace. They are only allowed to be downgraded in userspace.

Signed-off-by: Jinqian Yang <yangjinqian1@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

diff --git a/tools/testing/selftests/kvm/arm64/set_id_regs.c b/tools/testing/selftests/kvm/arm64/set_id_regs.c
index 189321e969258c3151608214daf86882b1e51a74..d0aaecf7771099c4e7af576c69526e98a2218562 100644 (file)
--- a/tools/testing/selftests/kvm/arm64/set_id_regs.c
+++ b/tools/testing/selftests/kvm/arm64/set_id_regs.c
@@ -165,7 +165,9 @@ static const struct reg_ftr_bits ftr_id_aa64mmfr0_el1[] = {
 static const struct reg_ftr_bits ftr_id_aa64mmfr1_el1[] = {
        REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, TIDCP1, 0),
        REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, AFP, 0),
+       REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, HCX, 0),
        REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, ETS, 0),
+       REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, TWED, 0),
        REG_FTR_BITS(FTR_HIGHER_SAFE, ID_AA64MMFR1_EL1, SpecSEI, 0),
        REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, PAN, 0),
        REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR1_EL1, LO, 0),