diff options
Diffstat (limited to 'arch/arm/kvm/interrupts_head.S')
| -rw-r--r-- | arch/arm/kvm/interrupts_head.S | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/kvm/interrupts_head.S b/arch/arm/kvm/interrupts_head.S index 8c875d54a089..06f251395bec 100644 --- a/arch/arm/kvm/interrupts_head.S +++ b/arch/arm/kvm/interrupts_head.S @@ -453,6 +453,37 @@ vcpu .req r0 @ vcpu pointer always in r0 #endif .endm +#define CNTHCTL_PL1PCTEN (1 << 0) +#define CNTHCTL_PL1PCEN (1 << 1) + +/* + * Save the timer state onto the VCPU and allow physical timer/counter access + * for the host. + * + * Assumes vcpu pointer in vcpu reg + */ +.macro save_timer_state + @ Allow physical timer/counter access for the host + mrc p15, 4, r2, c14, c1, 0 @ CNTHCTL + orr r2, r2, #(CNTHCTL_PL1PCEN | CNTHCTL_PL1PCTEN) + mcr p15, 4, r2, c14, c1, 0 @ CNTHCTL +.endm + +/* + * Load the timer state from the VCPU and deny physical timer/counter access + * for the host. + * + * Assumes vcpu pointer in vcpu reg + */ +.macro restore_timer_state + @ Disallow physical timer access for the guest + @ Physical counter access is allowed + mrc p15, 4, r2, c14, c1, 0 @ CNTHCTL + orr r2, r2, #CNTHCTL_PL1PCTEN + bic r2, r2, #CNTHCTL_PL1PCEN + mcr p15, 4, r2, c14, c1, 0 @ CNTHCTL +.endm + .equ vmentry, 0 .equ vmexit, 1 |