[PATCH v12 6/8] arm64: kvm: Expose KVM_ARM_CAP_MTE
From: Steven Price <steven.price@arm.com>
Date: 2021-05-17 12:33:43
Also in:
kvmarm, lkml, qemu-devel
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
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 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/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 88adbc2286f2..3a749fa0779b 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c@@ -1308,6 +1308,9 @@ 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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