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>,
Andrew Jones <drjones@redhat.com>
Subject: [PATCH v16 5/7] KVM: arm64: Expose KVM_ARM_CAP_MTE
Date: Fri, 18 Jun 2021 14:28:24 +0100 [thread overview]
Message-ID: <20210618132826.54670-6-steven.price@arm.com> (raw)
In-Reply-To: <20210618132826.54670-1-steven.price@arm.com>
It's now safe for the VMM to enable MTE in a guest, so expose the
capability to user space.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
arch/arm64/kvm/arm.c | 9 +++++++++
arch/arm64/kvm/reset.c | 3 ++-
arch/arm64/kvm/sys_regs.c | 3 +++
3 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 1cb39c0803a4..e89a5e275e25 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;
@@ -237,6 +243,9 @@ 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/reset.c b/arch/arm64/kvm/reset.c
index 956cdc240148..50635eacfa43 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -220,7 +220,8 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
switch (vcpu->arch.target) {
default:
if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) {
- if (!cpus_have_const_cap(ARM64_HAS_32BIT_EL1)) {
+ if (!cpus_have_const_cap(ARM64_HAS_32BIT_EL1) ||
+ vcpu->kvm->arch.mte_enabled) {
ret = -EINVAL;
goto out;
}
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 440315a556c2..d4e1c1b1a08d 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1312,6 +1312,9 @@ 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
next prev parent reply other threads:[~2021-06-18 13:28 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-18 13:28 [PATCH v16 0/7] MTE support for KVM guest Steven Price
2021-06-18 13:28 ` [PATCH v16 1/7] arm64: mte: Handle race when synchronising tags Steven Price
2021-06-18 14:40 ` Catalin Marinas
2021-06-18 15:42 ` Marc Zyngier
2021-06-21 8:27 ` Steven Price
2021-06-18 13:28 ` [PATCH v16 2/7] arm64: mte: Sync tags for pages where PTE is untagged Steven Price
2021-06-18 13:28 ` [PATCH v16 3/7] KVM: arm64: Introduce MTE VM feature Steven Price
2021-06-18 14:47 ` Catalin Marinas
2021-06-21 9:01 ` Marc Zyngier
2021-06-21 9:07 ` Steven Price
2021-06-18 13:28 ` [PATCH v16 4/7] KVM: arm64: Save/restore MTE registers Steven Price
2021-06-18 13:28 ` Steven Price [this message]
2021-06-18 13:28 ` [PATCH v16 6/7] KVM: arm64: ioctl to fetch/store tags in a guest Steven Price
2021-06-18 13:28 ` [PATCH v16 7/7] KVM: arm64: Document MTE capability and ioctl Steven Price
2021-06-18 14:52 ` Catalin Marinas
2021-06-21 8:18 ` Steven Price
2021-06-21 8:48 ` Catalin Marinas
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