Commit c4a6ed85 authored by Oliver Upton's avatar Oliver Upton Committed by Marc Zyngier
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KVM: arm64: Promote guest ownership for DBGxVR/DBGxCR reads 



Only yielding control of the debug registers for writes is a bit silly,
unless of course you're a fan of pointless traps. Give control of the
debug registers to the guest upon the first access, regardless of
direction.

Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20241219224116.3941496-20-oliver.upton@linux.dev


Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
parent 3ce9f335

arch/arm64/kvm/sys_regs.c

+1 −2
Original line number Diff line number Diff line
@@ -643,8 +643,6 @@ static void reg_to_dbg(struct kvm_vcpu *vcpu, 
	val &= ~mask;

	val |= (p->regval & (mask >> shift)) << shift;

	*dbg_reg = val;



	kvm_debug_set_guest_ownership(vcpu);

}



static void dbg_to_reg(struct kvm_vcpu *vcpu,
@@ -690,6 +688,7 @@ static bool trap_dbg_wb_reg(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 
	else

		dbg_to_reg(vcpu, p, rd, reg);



	kvm_debug_set_guest_ownership(vcpu);

	return true;

}