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>,
Jing Zhang <jingzhangos@google.com>,
Cornelia Huck <cohuck@redhat.com>,
Oliver Upton <oliver.upton@linux.dev>
Subject: [PATCH v11 07/12] KVM: arm64: Allow userspace to change ID_AA64MMFR{0-2}_EL1
Date: Tue, 3 Oct 2023 23:04:03 +0000 [thread overview]
Message-ID: <20231003230408.3405722-8-oliver.upton@linux.dev> (raw)
In-Reply-To: <20231003230408.3405722-1-oliver.upton@linux.dev>
From: Jing Zhang <jingzhangos@google.com>
Allow userspace to modify the guest-visible values of these ID
registers. Prevent changes to any of the virtualization features until
KVM picks up support for nested and we have a handle on managing NV
features.
Signed-off-by: Jing Zhang <jingzhangos@google.com>
[oliver: prevent changes to EL2 features for now]
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
arch/arm64/kvm/sys_regs.c | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 09be55338e0a..9e31887ee0f4 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -2099,9 +2099,23 @@ static const struct sys_reg_desc sys_reg_descs[] = {
ID_UNALLOCATED(6,7),
/* CRm=7 */
- ID_SANITISED(ID_AA64MMFR0_EL1),
- ID_SANITISED(ID_AA64MMFR1_EL1),
- ID_SANITISED(ID_AA64MMFR2_EL1),
+ ID_WRITABLE(ID_AA64MMFR0_EL1, ~(ID_AA64MMFR0_EL1_RES0 |
+ ID_AA64MMFR0_EL1_TGRAN4_2 |
+ ID_AA64MMFR0_EL1_TGRAN64_2 |
+ ID_AA64MMFR0_EL1_TGRAN16_2)),
+ ID_WRITABLE(ID_AA64MMFR1_EL1, ~(ID_AA64MMFR1_EL1_RES0 |
+ ID_AA64MMFR1_EL1_HCX |
+ ID_AA64MMFR1_EL1_XNX |
+ ID_AA64MMFR1_EL1_TWED |
+ ID_AA64MMFR1_EL1_XNX |
+ ID_AA64MMFR1_EL1_VH |
+ ID_AA64MMFR1_EL1_VMIDBits)),
+ ID_WRITABLE(ID_AA64MMFR2_EL1, ~(ID_AA64MMFR2_EL1_RES0 |
+ ID_AA64MMFR2_EL1_EVT |
+ ID_AA64MMFR2_EL1_FWB |
+ ID_AA64MMFR2_EL1_IDS |
+ ID_AA64MMFR2_EL1_NV |
+ ID_AA64MMFR2_EL1_CCIDX)),
ID_SANITISED(ID_AA64MMFR3_EL1),
ID_UNALLOCATED(7,4),
ID_UNALLOCATED(7,5),
--
2.42.0.609.gbb76f46606-goog
next prev parent reply other threads:[~2023-10-03 23:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-03 23:03 [PATCH v11 00/12] KVM: arm64: Enable 'writable' ID registers Oliver Upton
2023-10-03 23:03 ` [PATCH v11 01/12] KVM: arm64: Allow userspace to get the writable masks for feature " Oliver Upton
2023-10-03 23:03 ` [PATCH v11 02/12] KVM: arm64: Document KVM_ARM_GET_REG_WRITABLE_MASKS Oliver Upton
2023-10-03 23:03 ` [PATCH v11 03/12] KVM: arm64: Use guest ID register values for the sake of emulation Oliver Upton
2023-10-03 23:04 ` [PATCH v11 04/12] KVM: arm64: Reject attempts to set invalid debug arch version Oliver Upton
2023-10-03 23:04 ` [PATCH v11 05/12] KVM: arm64: Bump up the default KVM sanitised debug version to v8p8 Oliver Upton
2023-10-04 8:57 ` Marc Zyngier
2023-10-04 17:08 ` Oliver Upton
2023-10-04 17:46 ` Marc Zyngier
2023-10-03 23:04 ` [PATCH v11 06/12] KVM: arm64: Allow userspace to change ID_AA64ISAR{0-2}_EL1 Oliver Upton
2023-10-03 23:04 ` Oliver Upton [this message]
2023-10-03 23:04 ` [PATCH v11 08/12] KVM: arm64: Allow userspace to change ID_AA64PFR0_EL1 Oliver Upton
2023-10-03 23:04 ` [PATCH v11 09/12] KVM: arm64: Allow userspace to change ID_AA64ZFR0_EL1 Oliver Upton
2023-10-03 23:04 ` [PATCH v11 10/12] KVM: arm64: Document vCPU feature selection UAPIs Oliver Upton
2023-10-04 9:36 ` Marc Zyngier
2023-10-04 16:52 ` Oliver Upton
2023-10-04 17:48 ` Marc Zyngier
2023-10-03 23:04 ` [PATCH v11 11/12] KVM: arm64: selftests: Import automatic generation of sysreg defs Oliver Upton
2023-10-03 23:04 ` [PATCH v11 12/12] KVM: arm64: selftests: Test for setting ID register from usersapce Oliver Upton
2023-10-04 9:40 ` [PATCH v11 00/12] KVM: arm64: Enable 'writable' ID registers Marc Zyngier
2023-10-04 16:53 ` Oliver Upton
2023-10-04 17:46 ` Oliver Upton
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