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ARM: KVM: VGIC control interface world switch

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Enable the VGIC control interface to be save-restored on world switch.

Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2013-01-21 19:36:15 -05:00
parent 5863c2ce72
commit 348b2b0708
2 changed files with 86 additions and 0 deletions
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12
arch/arm/kernel/asm-offsets.c
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@ -169,6 +169,18 @@ int main(void)
DEFINE(VCPU_HxFAR, offsetof(struct kvm_vcpu, arch.hxfar));
DEFINE(VCPU_HPFAR, offsetof(struct kvm_vcpu, arch.hpfar));
DEFINE(VCPU_HYP_PC, offsetof(struct kvm_vcpu, arch.hyp_pc));
#ifdef CONFIG_KVM_ARM_VGIC
DEFINE(VCPU_VGIC_CPU, offsetof(struct kvm_vcpu, arch.vgic_cpu));
DEFINE(VGIC_CPU_HCR, offsetof(struct vgic_cpu, vgic_hcr));
DEFINE(VGIC_CPU_VMCR, offsetof(struct vgic_cpu, vgic_vmcr));
DEFINE(VGIC_CPU_MISR, offsetof(struct vgic_cpu, vgic_misr));
DEFINE(VGIC_CPU_EISR, offsetof(struct vgic_cpu, vgic_eisr));
DEFINE(VGIC_CPU_ELRSR, offsetof(struct vgic_cpu, vgic_elrsr));
DEFINE(VGIC_CPU_APR, offsetof(struct vgic_cpu, vgic_apr));
DEFINE(VGIC_CPU_LR, offsetof(struct vgic_cpu, vgic_lr));
DEFINE(VGIC_CPU_NR_LR, offsetof(struct vgic_cpu, nr_lr));
DEFINE(KVM_VGIC_VCTRL, offsetof(struct kvm, arch.vgic.vctrl_base));
#endif
DEFINE(KVM_VTTBR, offsetof(struct kvm, arch.vttbr));
#endif
return 0;

74
arch/arm/kvm/interrupts_head.S
View File

@ -1,3 +1,5 @@
#include <linux/irqchip/arm-gic.h>
#define VCPU_USR_REG(_reg_nr) (VCPU_USR_REGS + (_reg_nr * 4))
#define VCPU_USR_SP (VCPU_USR_REG(13))
#define VCPU_USR_LR (VCPU_USR_REG(14))
@ -369,6 +371,49 @@ vcpu .req r0 @ vcpu pointer always in r0
* Assumes vcpu pointer in vcpu reg
*/
.macro save_vgic_state
#ifdef CONFIG_KVM_ARM_VGIC
/* Get VGIC VCTRL base into r2 */
ldr r2, [vcpu, #VCPU_KVM]
ldr r2, [r2, #KVM_VGIC_VCTRL]
cmp r2, #0
beq 2f
/* Compute the address of struct vgic_cpu */
add r11, vcpu, #VCPU_VGIC_CPU
/* Save all interesting registers */
ldr r3, [r2, #GICH_HCR]
ldr r4, [r2, #GICH_VMCR]
ldr r5, [r2, #GICH_MISR]
ldr r6, [r2, #GICH_EISR0]
ldr r7, [r2, #GICH_EISR1]
ldr r8, [r2, #GICH_ELRSR0]
ldr r9, [r2, #GICH_ELRSR1]
ldr r10, [r2, #GICH_APR]
str r3, [r11, #VGIC_CPU_HCR]
str r4, [r11, #VGIC_CPU_VMCR]
str r5, [r11, #VGIC_CPU_MISR]
str r6, [r11, #VGIC_CPU_EISR]
str r7, [r11, #(VGIC_CPU_EISR + 4)]
str r8, [r11, #VGIC_CPU_ELRSR]
str r9, [r11, #(VGIC_CPU_ELRSR + 4)]
str r10, [r11, #VGIC_CPU_APR]
/* Clear GICH_HCR */
mov r5, #0
str r5, [r2, #GICH_HCR]
/* Save list registers */
add r2, r2, #GICH_LR0
add r3, r11, #VGIC_CPU_LR
ldr r4, [r11, #VGIC_CPU_NR_LR]
1: ldr r6, [r2], #4
str r6, [r3], #4
subs r4, r4, #1
bne 1b
2:
#endif
.endm
/*
@ -377,6 +422,35 @@ vcpu .req r0 @ vcpu pointer always in r0
* Assumes vcpu pointer in vcpu reg
*/
.macro restore_vgic_state
#ifdef CONFIG_KVM_ARM_VGIC
/* Get VGIC VCTRL base into r2 */
ldr r2, [vcpu, #VCPU_KVM]
ldr r2, [r2, #KVM_VGIC_VCTRL]
cmp r2, #0
beq 2f
/* Compute the address of struct vgic_cpu */
add r11, vcpu, #VCPU_VGIC_CPU
/* We only restore a minimal set of registers */
ldr r3, [r11, #VGIC_CPU_HCR]
ldr r4, [r11, #VGIC_CPU_VMCR]
ldr r8, [r11, #VGIC_CPU_APR]
str r3, [r2, #GICH_HCR]
str r4, [r2, #GICH_VMCR]
str r8, [r2, #GICH_APR]
/* Restore list registers */
add r2, r2, #GICH_LR0
add r3, r11, #VGIC_CPU_LR
ldr r4, [r11, #VGIC_CPU_NR_LR]
1: ldr r6, [r3], #4
str r6, [r2], #4
subs r4, r4, #1
bne 1b
2:
#endif
.endm
.equ vmentry, 0