Commit be0135bd authored by Marc Zyngier's avatar Marc Zyngier
Browse files

KVM: arm64: nv: Add basic emulation of AT S1E1{R,W}P 



Building on top of our primitive AT S1E{0,1}{R,W} emulation,
add minimal support for the FEAT_PAN2 instructions, momentary
context-switching PSTATE.PAN so that it takes effect in the
context of the guest.

Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
parent 477e89ca

arch/arm64/kvm/at.c

+26 −0
Original line number Diff line number Diff line
@@ -49,6 +49,28 @@ static void __mmu_config_restore(struct mmu_config *config) 
	write_sysreg(config->vtcr,	vtcr_el2);

}



static bool at_s1e1p_fast(struct kvm_vcpu *vcpu, u32 op, u64 vaddr)

{

	u64 host_pan;

	bool fail;



	host_pan = read_sysreg_s(SYS_PSTATE_PAN);

	write_sysreg_s(*vcpu_cpsr(vcpu) & PSTATE_PAN, SYS_PSTATE_PAN);



	switch (op) {

	case OP_AT_S1E1RP:

		fail = __kvm_at(OP_AT_S1E1RP, vaddr);

		break;

	case OP_AT_S1E1WP:

		fail = __kvm_at(OP_AT_S1E1WP, vaddr);

		break;

	}



	write_sysreg_s(host_pan, SYS_PSTATE_PAN);



	return fail;

}



/*

 * Return the PAR_EL1 value as the result of a valid translation.

 *
@@ -105,6 +127,10 @@ static u64 __kvm_at_s1e01_fast(struct kvm_vcpu *vcpu, u32 op, u64 vaddr) 
	isb();



	switch (op) {

	case OP_AT_S1E1RP:

	case OP_AT_S1E1WP:

		fail = at_s1e1p_fast(vcpu, op, vaddr);

		break;

	case OP_AT_S1E1R:

		fail = __kvm_at(OP_AT_S1E1R, vaddr);

		break;