From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
kvm@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Oliver Upton <oliver.upton@linux.dev>,
Zenghui Yu <yuzenghui@huawei.com>, Fuad Tabba <tabba@google.com>,
Joey Gouly <joey.gouly@arm.com>, Mark Brown <broonie@kernel.org>
Subject: [PATCH v4 6/8] KVM: arm64: Expose ID_AA64FPFR0_EL1 as a writable ID reg
Date: Tue, 20 Aug 2024 14:18:00 +0100 [thread overview]
Message-ID: <20240820131802.3547589-7-maz@kernel.org> (raw)
In-Reply-To: <20240820131802.3547589-1-maz@kernel.org>
ID_AA64FPFR0_EL1 contains all sort of bits that contain a description
of which FP8 subfeatures are implemented.
We don't really care about them, so let's just expose that register
and allow userspace to disable subfeatures at will.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kvm/sys_regs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 79d67f19130d..4c2f7c0af537 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2386,7 +2386,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0),
ID_HIDDEN(ID_AA64SMFR0_EL1),
ID_UNALLOCATED(4,6),
- ID_UNALLOCATED(4,7),
+ ID_WRITABLE(ID_AA64FPFR0_EL1, ~ID_AA64FPFR0_EL1_RES0),
/* CRm=5 */
{ SYS_DESC(SYS_ID_AA64DFR0_EL1),
--
2.39.2
next prev parent reply other threads:[~2024-08-20 13:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-20 13:17 [PATCH v4 0/8] KVM: arm64: Add support for FP8 Marc Zyngier
2024-08-20 13:17 ` [PATCH v4 1/8] KVM: arm64: Move SVCR into the sysreg array Marc Zyngier
2024-08-20 13:17 ` [PATCH v4 2/8] KVM: arm64: Add predicate for FPMR support in a VM Marc Zyngier
2024-08-20 13:17 ` [PATCH v4 3/8] KVM: arm64: Move FPMR into the sysreg array Marc Zyngier
2024-08-20 13:17 ` [PATCH v4 4/8] KVM: arm64: Add save/restore support for FPMR Marc Zyngier
2024-08-20 13:17 ` [PATCH v4 5/8] KVM: arm64: Honor trap routing " Marc Zyngier
2024-08-20 13:18 ` Marc Zyngier [this message]
2024-08-20 13:18 ` [PATCH v4 7/8] KVM: arm64: Enable FP8 support when available and configured Marc Zyngier
2024-08-20 13:18 ` [PATCH v4 8/8] KVM: arm64: Expose ID_AA64PFR2_EL1 to userspace and guests Marc Zyngier
2024-08-21 14:34 ` [PATCH v4 0/8] KVM: arm64: Add support for FP8 Mark Brown
2024-08-27 7:07 ` Marc Zyngier
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