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KVM: arm64: Promote guest ownership for DBGxVR/DBGxCR reads

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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: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20241219224116.3941496-20-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Oliver Upton 2024-12-19 14:41:16 -08:00 committed by Marc Zyngier
parent 3ce9f3357e
commit c4a6ed8545
1 changed files with 1 additions and 2 deletions
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3
arch/arm64/kvm/sys_regs.c
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@ -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;
}