diff options
| author | Fuad Tabba <tabba@google.com> | 2025-12-11 10:47:01 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2026-01-15 15:42:18 +0000 |
| commit | 288eb55483c05bc37379a781d0d18b8e6c280f92 (patch) | |
| tree | 9bf55a85ab2bb5d85915b1e92b126ffe20b58e23 /arch | |
| parent | 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb (diff) | |
KVM: arm64: Fix Trace Buffer trapping for protected VMs
For protected VMs in pKVM, the hypervisor should trap accesses to trace
buffer system registers if Trace Buffer isn't supported by the VM.
However, the current code only traps if Trace Buffer External Mode isn't
supported.
Fix this by checking for FEAT_TRBE (Trace Buffer) rather than
FEAT_TRBE_EXT.
Fixes: 9d5261269098 ("KVM: arm64: Trap external trace for protected VMs")
Reported-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20251211104710.151771-2-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/pkvm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c index 8911338961c5..f0bfab99c334 100644 --- a/arch/arm64/kvm/hyp/nvhe/pkvm.c +++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c @@ -117,7 +117,7 @@ static void pvm_init_traps_mdcr(struct kvm_vcpu *vcpu) if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, TraceFilt, IMP)) val |= MDCR_EL2_TTRF; - if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, ExtTrcBuff, IMP)) + if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, TraceBuffer, IMP)) val |= MDCR_EL2_E2TB_MASK; /* Trap Debug Communications Channel registers */ |