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KVM: arm64: Trap external trace for protected VMs

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pKVM does not support external trace for protected VMs. Trap
external trace, and add the ExtTrcBuff to make it possible to
check for the feature.

Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231214100158.2305400-18-tabba@google.com
This commit is contained in:
Fuad Tabba 2023-12-14 10:01:57 +00:00 committed by Marc Zyngier
parent 21de26dbc5
commit 9d52612690
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/kvm/hyp/nvhe/pkvm.c
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@ -136,6 +136,10 @@ static void pvm_init_traps_aa64dfr0(struct kvm_vcpu *vcpu)
cptr_set |= CPTR_EL2_TTA;
}
/* Trap External Trace */
if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_ExtTrcBuff), feature_ids))
mdcr_clear |= MDCR_EL2_E2TB_MASK << MDCR_EL2_E2TB_SHIFT;
vcpu->arch.mdcr_el2 |= mdcr_set;
vcpu->arch.mdcr_el2 &= ~mdcr_clear;
vcpu->arch.cptr_el2 |= cptr_set;