Commit 5cfb6cec authored by Marc Zyngier's avatar Marc Zyngier Committed by Oliver Upton
Browse files

KVM: arm64: nv: Handle TLBI ALLE1{,IS} operations 



TLBI ALLE1* is a pretty big hammer that invalides all S1/S2 TLBs.

This translates into the unmapping of all our shadow S2 PTs, itself
resulting in the corresponding TLB invalidations.

Co-developed-by: default avatarJintack Lim <jintack.lim@linaro.org>
Co-developed-by: default avatarChristoffer Dall <christoffer.dall@arm.com>
Signed-off-by: default avatarJintack Lim <jintack.lim@linaro.org>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@arm.com>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240614144552.2773592-10-maz@kernel.org


Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
parent e6c9a301

arch/arm64/kvm/sys_regs.c

+25 −0
Original line number Diff line number Diff line
@@ -2757,6 +2757,29 @@ static bool kvm_supported_tlbi_s12_op(struct kvm_vcpu *vpcu, u32 instr) 
	return true;

}



static bool handle_alle1is(struct kvm_vcpu *vcpu, struct sys_reg_params *p,

			   const struct sys_reg_desc *r)

{

	u32 sys_encoding = sys_insn(p->Op0, p->Op1, p->CRn, p->CRm, p->Op2);



	if (!kvm_supported_tlbi_s12_op(vcpu, sys_encoding)) {

		kvm_inject_undefined(vcpu);

		return false;

	}



	write_lock(&vcpu->kvm->mmu_lock);



	/*

	 * Drop all shadow S2s, resulting in S1/S2 TLBIs for each of the

	 * corresponding VMIDs.

	 */

	kvm_nested_s2_unmap(vcpu->kvm);



	write_unlock(&vcpu->kvm->mmu_lock);



	return true;

}



/* Only defined here as this is an internal "abstraction" */

union tlbi_info {

	struct {
@@ -2880,7 +2903,9 @@ static struct sys_reg_desc sys_insn_descs[] = { 
	SYS_INSN(TLBI_VALE1, handle_tlbi_el1),

	SYS_INSN(TLBI_VAALE1, handle_tlbi_el1),



	SYS_INSN(TLBI_ALLE1IS, handle_alle1is),

	SYS_INSN(TLBI_VMALLS12E1IS, handle_vmalls12e1is),

	SYS_INSN(TLBI_ALLE1, handle_alle1is),

	SYS_INSN(TLBI_VMALLS12E1, handle_vmalls12e1is),

};