linux-kernel - [PATCH v7 5/8] arm64/kvm: expose MTE_STORE

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Message-Id: <20250618092957.2069907-6-yeoreum.yun@arm.com>
Date: Wed, 18 Jun 2025 10:29:54 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: catalin.marinas@....com,
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Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v7 5/8] arm64/kvm: expose MTE_STORE_ONLY feature to guest

expose MTE_STORE_ONLY feature to guest.

Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
---
 arch/arm64/kvm/sys_regs.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index c8c92cb9da01..7bc99ed201eb 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1620,7 +1620,8 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
 		mask = ID_AA64PFR2_EL1_FPMR;
 
 		if (kvm_has_mte(vcpu->kvm))
-			mask |= ID_AA64PFR2_EL1_MTEFAR;
+			mask |= ID_AA64PFR2_EL1_MTEFAR |
+				ID_AA64PFR2_EL1_MTESTOREONLY;
 
 		val &= mask;
 		break;
@@ -2884,7 +2885,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 				       ID_AA64PFR1_EL1_MTE)),
 	ID_WRITABLE(ID_AA64PFR2_EL1,
 		    ID_AA64PFR2_EL1_FPMR |
-		    ID_AA64PFR2_EL1_MTEFAR),
+		    ID_AA64PFR2_EL1_MTEFAR |
+		    ID_AA64PFR2_EL1_MTESTOREONLY),
 	ID_UNALLOCATED(4,3),
 	ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0),
 	ID_HIDDEN(ID_AA64SMFR0_EL1),
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}