linux-kernel - [PATCH v3 2/2] KVM: arm64: selftests: Test writes to ID_AA64MMFR1

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Message-ID: <20250911114621.3724469-3-yangjinqian1@huawei.com>
Date: Thu, 11 Sep 2025 19:46:21 +0800
From: Jinqian Yang <yangjinqian1@...wei.com>
To: <oliver.upton@...ux.dev>, <yuzenghui@...wei.com>, <maz@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <liuyonglong@...wei.com>,
	<wangzhou1@...ilicon.com>, <yangjinqian1@...wei.com>
Subject: [PATCH v3 2/2] 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@...wei.com>
---
 tools/testing/selftests/kvm/arm64/set_id_regs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/kvm/arm64/set_id_regs.c b/tools/testing/selftests/kvm/arm64/set_id_regs.c
index d3bf9204409c..a889550d8aa4 100644
--- 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),
-- 
2.33.0