diff options
| author | Steven Price <steven.price@arm.com> | 2021-06-21 12:17:12 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-06-22 14:08:05 +0100 |
| commit | ea7fc1bb1cd1b92b42b1d9273ce7e231d3dc9321 (patch) | |
| tree | 69524ca0a8e1c7048db4490cb5b73ad65266f2c5 /arch/arm64/kvm/hyp/exception.c | |
| parent | 69e3b846d8a753f9f279f29531ca56b0f7563ad0 (diff) | |
KVM: arm64: Introduce MTE VM feature
Add a new VM feature 'KVM_ARM_CAP_MTE' which enables memory tagging
for a VM. This will expose the feature to the guest and automatically
tag memory pages touched by the VM as PG_mte_tagged (and clear the tag
storage) to ensure that the guest cannot see stale tags, and so that
the tags are correctly saved/restored across swap.
Actually exposing the new capability to user space happens in a later
patch.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
[maz: move VM_SHARED sampling into the critical section]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210621111716.37157-3-steven.price@arm.com
Diffstat (limited to 'arch/arm64/kvm/hyp/exception.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/exception.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/kvm/hyp/exception.c b/arch/arm64/kvm/hyp/exception.c index 11541b94b328..0418399e0a20 100644 --- a/arch/arm64/kvm/hyp/exception.c +++ b/arch/arm64/kvm/hyp/exception.c @@ -112,7 +112,8 @@ static void enter_exception64(struct kvm_vcpu *vcpu, unsigned long target_mode, new |= (old & PSR_C_BIT); new |= (old & PSR_V_BIT); - // TODO: TCO (if/when ARMv8.5-MemTag is exposed to guests) + if (kvm_has_mte(vcpu->kvm)) + new |= PSR_TCO_BIT; new |= (old & PSR_DIT_BIT); |