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 7/8] KVM: arm64: Enable FP8 support when available and configured
Date: Tue, 20 Aug 2024 14:18:01 +0100 [thread overview]
Message-ID: <20240820131802.3547589-8-maz@kernel.org> (raw)
In-Reply-To: <20240820131802.3547589-1-maz@kernel.org>
If userspace has enabled FP8 support (by setting ID_AA64PFR2_EL1.FPMR
to 1), let's enable the feature by setting HCRX_EL2.EnFPM for the vcpu.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kvm/sys_regs.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 4c2f7c0af537..51627add0a72 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -4579,6 +4579,9 @@ void kvm_calculate_traps(struct kvm_vcpu *vcpu)
if (kvm_has_feat(kvm, ID_AA64MMFR3_EL1, TCRX, IMP))
vcpu->arch.hcrx_el2 |= HCRX_EL2_TCR2En;
+
+ if (kvm_has_fpmr(kvm))
+ vcpu->arch.hcrx_el2 |= HCRX_EL2_EnFPM;
}
if (test_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags))
--
2.39.2
next prev parent reply other threads:[~2024-08-20 13:18 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 ` [PATCH v4 6/8] KVM: arm64: Expose ID_AA64FPFR0_EL1 as a writable ID reg Marc Zyngier
2024-08-20 13:18 ` Marc Zyngier [this message]
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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