Commit 9d526126 authored by Fuad Tabba's avatar Fuad Tabba Committed by Marc Zyngier
Browse files

KVM: arm64: Trap external trace for protected VMs 



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: default avatarFuad Tabba <tabba@google.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231214100158.2305400-18-tabba@google.com
parent 21de26db

arch/arm64/kvm/hyp/nvhe/pkvm.c

+4 −0
Original line number Diff line number Diff line
@@ -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;