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Commit bb5ed703 authored by Christoffer Dall's avatar Christoffer Dall Committed by Marc Zyngier
Browse files

KVM: arm/arm64: Get rid of vgic_elrsr 



There is really no need to store the vgic_elrsr on the VGIC data
structures as the only need we have for the elrsr is to figure out if an
LR is inactive when we save the VGIC state upon returning from the
guest.  We can might as well store this in a temporary local variable.

Reviewed-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent b7787e66

include/kvm/arm_vgic.h

+0 −2
Original line number Diff line number Diff line
@@ -263,7 +263,6 @@ struct vgic_dist { 
struct vgic_v2_cpu_if {

	u32		vgic_hcr;

	u32		vgic_vmcr;

	u64		vgic_elrsr;	/* Saved only */

	u32		vgic_apr;

	u32		vgic_lr[VGIC_V2_MAX_LRS];

};
@@ -272,7 +271,6 @@ struct vgic_v3_cpu_if { 
	u32		vgic_hcr;

	u32		vgic_vmcr;

	u32		vgic_sre;	/* Restored only, change ignored */

	u32		vgic_elrsr;	/* Saved only */

	u32		vgic_ap0r[4];

	u32		vgic_ap1r[4];

	u64		vgic_lr[VGIC_V3_MAX_LRS];

virt/kvm/arm/hyp/vgic-v2-sr.c

+7 −21
Original line number Diff line number Diff line
@@ -23,29 +23,19 @@ 
#include <asm/kvm_hyp.h>

#include <asm/kvm_mmu.h>



static void __hyp_text save_elrsr(struct kvm_vcpu *vcpu, void __iomem *base)

{

	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;

	int nr_lr = (kern_hyp_va(&kvm_vgic_global_state))->nr_lr;

	u32 elrsr0, elrsr1;



	elrsr0 = readl_relaxed(base + GICH_ELRSR0);

	if (unlikely(nr_lr > 32))

		elrsr1 = readl_relaxed(base + GICH_ELRSR1);

	else

		elrsr1 = 0;



	cpu_if->vgic_elrsr = ((u64)elrsr1 << 32) | elrsr0;

}



static void __hyp_text save_lrs(struct kvm_vcpu *vcpu, void __iomem *base)

{

	struct vgic_v2_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v2;

	int i;

	u64 used_lrs = vcpu->arch.vgic_cpu.used_lrs;

	u64 elrsr;

	int i;



	elrsr = readl_relaxed(base + GICH_ELRSR0);

	if (unlikely(used_lrs > 32))

		elrsr |= ((u64)readl_relaxed(base + GICH_ELRSR1)) << 32;



	for (i = 0; i < used_lrs; i++) {

		if (cpu_if->vgic_elrsr & (1UL << i))

		if (elrsr & (1UL << i))

			cpu_if->vgic_lr[i] &= ~GICH_LR_STATE;

		else

			cpu_if->vgic_lr[i] = readl_relaxed(base + GICH_LR0 + (i * 4));
@@ -68,13 +58,9 @@ void __hyp_text __vgic_v2_save_state(struct kvm_vcpu *vcpu) 


	if (used_lrs) {

		cpu_if->vgic_apr = readl_relaxed(base + GICH_APR);



		save_elrsr(vcpu, base);

		save_lrs(vcpu, base);



		writel_relaxed(0, base + GICH_HCR);

	} else {

		cpu_if->vgic_elrsr = ~0UL;

		cpu_if->vgic_apr = 0;

	}

}

virt/kvm/arm/hyp/vgic-v3-sr.c

+3 −3
Original line number Diff line number Diff line
@@ -222,15 +222,16 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu) 
	if (used_lrs) {

		int i;

		u32 nr_pre_bits;

		u32 elrsr;



		cpu_if->vgic_elrsr = read_gicreg(ICH_ELSR_EL2);

		elrsr = read_gicreg(ICH_ELSR_EL2);



		write_gicreg(0, ICH_HCR_EL2);

		val = read_gicreg(ICH_VTR_EL2);

		nr_pre_bits = vtr_to_nr_pre_bits(val);



		for (i = 0; i < used_lrs; i++) {

			if (cpu_if->vgic_elrsr & (1 << i))

			if (elrsr & (1 << i))

				cpu_if->vgic_lr[i] &= ~ICH_LR_STATE;

			else

				cpu_if->vgic_lr[i] = __gic_v3_get_lr(i);
@@ -262,7 +263,6 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu) 
		    cpu_if->its_vpe.its_vm)

			write_gicreg(0, ICH_HCR_EL2);



		cpu_if->vgic_elrsr = 0xffff;

		cpu_if->vgic_ap0r[0] = 0;

		cpu_if->vgic_ap0r[1] = 0;

		cpu_if->vgic_ap0r[2] = 0;

virt/kvm/arm/vgic/vgic-v2.c

+0 −1
Original line number Diff line number Diff line
@@ -265,7 +265,6 @@ void vgic_v2_enable(struct kvm_vcpu *vcpu) 
	 * anyway.

	 */

	vcpu->arch.vgic_cpu.vgic_v2.vgic_vmcr = 0;

	vcpu->arch.vgic_cpu.vgic_v2.vgic_elrsr = ~0;



	/* Get the show on the road... */

	vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr = GICH_HCR_EN;

virt/kvm/arm/vgic/vgic-v3.c

+0 −1
Original line number Diff line number Diff line
@@ -267,7 +267,6 @@ void vgic_v3_enable(struct kvm_vcpu *vcpu) 
	 * anyway.

	 */

	vgic_v3->vgic_vmcr = 0;

	vgic_v3->vgic_elrsr = ~0;



	/*

	 * If we are emulating a GICv3, we do it in an non-GICv2-compatible