From: Oliver Upton <oliver.upton@linux.dev>
To: kvmarm@lists.linux.dev
Cc: kvm@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>, Will Deacon <will@kernel.org>,
Cornelia Huck <cohuck@redhat.com>,
Oliver Upton <oliver.upton@linux.dev>
Subject: [PATCH v10 09/12] KVM: arm64: Allow userspace to change ID_AA64ZFR0_EL1
Date: Wed, 20 Sep 2023 18:33:06 +0000 [thread overview]
Message-ID: <20230920183310.1163034-10-oliver.upton@linux.dev> (raw)
In-Reply-To: <20230920183310.1163034-1-oliver.upton@linux.dev>
All known fields in ID_AA64ZFR0_EL1 describe the unprivileged
instructions supported by the PE's SVE implementation. Allow userspace
to pick and choose the advertised feature set, though nothing stops the
guest from using undisclosed instructions.
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
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 8738b0a0cf5c..c74920063287 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2071,7 +2071,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
ID_SANITISED(ID_AA64PFR1_EL1),
ID_UNALLOCATED(4,2),
ID_UNALLOCATED(4,3),
- ID_SANITISED(ID_AA64ZFR0_EL1),
+ ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0),
ID_HIDDEN(ID_AA64SMFR0_EL1),
ID_UNALLOCATED(4,6),
ID_UNALLOCATED(4,7),
--
2.42.0.515.g380fc7ccd1-goog
next prev parent reply other threads:[~2023-09-20 18:33 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-20 18:32 [PATCH v10 00/12] KVM: arm64: Enable 'writable' ID registers Oliver Upton
2023-09-20 18:32 ` [PATCH v10 01/12] KVM: arm64: Allow userspace to get the writable masks for feature " Oliver Upton
2023-09-21 9:53 ` Cornelia Huck
2023-09-21 18:20 ` Oliver Upton
2023-09-20 18:32 ` [PATCH v10 02/12] KVM: arm64: Document KVM_ARM_GET_REG_WRITABLE_MASKS Oliver Upton
2023-09-21 9:56 ` Cornelia Huck
2023-09-20 18:33 ` [PATCH v10 03/12] KVM: arm64: Use guest ID register values for the sake of emulation Oliver Upton
2023-09-20 18:33 ` [PATCH v10 04/12] KVM: arm64: Reject attempts to set invalid debug arch version Oliver Upton
2023-09-20 18:33 ` [PATCH v10 05/12] KVM: arm64: Bump up the default KVM sanitised debug version to v8p8 Oliver Upton
2023-09-20 18:33 ` [PATCH v10 06/12] KVM: arm64: Allow userspace to change ID_AA64ISAR{0-2}_EL1 Oliver Upton
2023-09-22 17:18 ` Kristina Martsenko
2023-09-22 17:20 ` Kristina Martsenko
2023-09-22 17:52 ` Oliver Upton
2023-10-03 19:41 ` Oliver Upton
2023-09-20 18:33 ` [PATCH v10 07/12] KVM: arm64: Allow userspace to change ID_AA64MMFR{0-2}_EL1 Oliver Upton
2023-09-20 18:33 ` [PATCH v10 08/12] KVM: arm64: Allow userspace to change ID_AA64PFR0_EL1 Oliver Upton
2023-09-20 18:33 ` Oliver Upton [this message]
2023-09-20 18:33 ` [PATCH v10 10/12] KVM: arm64: Document vCPU feature selection UAPIs Oliver Upton
2023-09-27 2:45 ` kernel test robot
2023-10-03 19:37 ` Oliver Upton
2023-09-20 18:33 ` [PATCH v10 11/12] KVM: arm64: selftests: Import automatic generation of sysreg defs Oliver Upton
2023-09-20 18:33 ` [PATCH v10 12/12] KVM: arm64: selftests: Test for setting ID register from usersapce Oliver Upton
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