From: Steven Price <steven.price@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>
Cc: Steven Price <steven.price@arm.com>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Dave Martin <Dave.Martin@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
qemu-devel@nongnu.org, Juan Quintela <quintela@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
Peter Maydell <peter.maydell@linaro.org>,
Haibo Xu <Haibo.Xu@arm.com>, Andrew Jones <drjones@redhat.com>
Subject: [PATCH v10 4/6] arm64: kvm: Expose KVM_ARM_CAP_MTE
Date: Fri, 12 Mar 2021 15:19:00 +0000 [thread overview]
Message-ID: <20210312151902.17853-5-steven.price@arm.com> (raw)
In-Reply-To: <20210312151902.17853-1-steven.price@arm.com>
It's now safe for the VMM to enable MTE in a guest, so expose the
capability to user space.
Signed-off-by: Steven Price <steven.price@arm.com>
---
arch/arm64/kvm/arm.c | 9 +++++++++
arch/arm64/kvm/sys_regs.c | 3 +++
2 files changed, 12 insertions(+)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index fc4c95dd2d26..46bf319f6cb7 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -93,6 +93,12 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
r = 0;
kvm->arch.return_nisv_io_abort_to_user = true;
break;
+ case KVM_CAP_ARM_MTE:
+ if (!system_supports_mte() || kvm->created_vcpus)
+ return -EINVAL;
+ r = 0;
+ kvm->arch.mte_enabled = true;
+ break;
default:
r = -EINVAL;
break;
@@ -234,6 +240,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
*/
r = 1;
break;
+ case KVM_CAP_ARM_MTE:
+ r = system_supports_mte();
+ break;
case KVM_CAP_STEAL_TIME:
r = kvm_arm_pvtime_supported();
break;
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 377ae6efb0ef..46937bfaac8a 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1306,6 +1306,9 @@ static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
static unsigned int mte_visibility(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *rd)
{
+ if (kvm_has_mte(vcpu->kvm))
+ return 0;
+
return REG_HIDDEN;
}
--
2.20.1
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next prev parent reply other threads:[~2021-03-12 15:21 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 15:18 [PATCH v10 0/6] MTE support for KVM guest Steven Price
2021-03-12 15:18 ` [PATCH v10 1/6] arm64: mte: Sync tags for pages where PTE is untagged Steven Price
2021-03-26 18:56 ` Catalin Marinas
2021-03-29 15:55 ` Steven Price
2021-03-30 10:13 ` Catalin Marinas
2021-03-31 10:09 ` Steven Price
2021-03-12 15:18 ` [PATCH v10 2/6] arm64: kvm: Introduce MTE VM feature Steven Price
2021-03-27 15:23 ` Catalin Marinas
2021-03-28 12:21 ` Catalin Marinas
2021-03-29 16:06 ` Steven Price
2021-03-30 10:30 ` Catalin Marinas
2021-03-31 7:34 ` David Hildenbrand
2021-03-31 9:21 ` Catalin Marinas
2021-03-31 9:32 ` David Hildenbrand
2021-03-31 10:41 ` Steven Price
2021-03-31 14:14 ` David Hildenbrand
2021-03-31 18:43 ` Catalin Marinas
2021-04-07 10:20 ` Steven Price
2021-04-07 15:14 ` Catalin Marinas
2021-04-07 15:30 ` David Hildenbrand
2021-04-07 15:52 ` Steven Price
2021-04-08 14:18 ` Catalin Marinas
2021-04-08 18:16 ` David Hildenbrand
2021-04-08 18:21 ` Catalin Marinas
2021-03-12 15:18 ` [PATCH v10 3/6] arm64: kvm: Save/restore MTE registers Steven Price
2021-03-12 15:19 ` Steven Price [this message]
2021-03-12 15:19 ` [PATCH v10 5/6] KVM: arm64: ioctl to fetch/store tags in a guest Steven Price
2021-03-12 15:19 ` [PATCH v10 6/6] KVM: arm64: Document MTE capability and ioctl Steven Price
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