From 003300de6c3e51934fb52eb2677f6f4fb4996cbd Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 7 Dec 2012 17:52:03 +0000 Subject: arm64: KVM: Plug the arch timer Add support for the in-kernel timer emulation. Reviewed-by: Christopher Covington Reviewed-by: Catalin Marinas Signed-off-by: Marc Zyngier --- arch/arm64/kvm/hyp.S | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++ arch/arm64/kvm/reset.c | 12 +++++++++++ 2 files changed, 68 insertions(+) (limited to 'arch/arm64') diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S index 8dc27a367d77..8b510835b440 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -390,6 +390,60 @@ __kvm_hyp_code_start: 2: .endm +.macro save_timer_state + // x0: vcpu pointer + ldr x2, [x0, #VCPU_KVM] + kern_hyp_va x2 + ldr w3, [x2, #KVM_TIMER_ENABLED] + cbz w3, 1f + + mrs x3, cntv_ctl_el0 + and x3, x3, #3 + str w3, [x0, #VCPU_TIMER_CNTV_CTL] + bic x3, x3, #1 // Clear Enable + msr cntv_ctl_el0, x3 + + isb + + mrs x3, cntv_cval_el0 + str x3, [x0, #VCPU_TIMER_CNTV_CVAL] + +1: + // Allow physical timer/counter access for the host + mrs x2, cnthctl_el2 + orr x2, x2, #3 + msr cnthctl_el2, x2 + + // Clear cntvoff for the host + msr cntvoff_el2, xzr +.endm + +.macro restore_timer_state + // x0: vcpu pointer + // Disallow physical timer access for the guest + // Physical counter access is allowed + mrs x2, cnthctl_el2 + orr x2, x2, #1 + bic x2, x2, #2 + msr cnthctl_el2, x2 + + ldr x2, [x0, #VCPU_KVM] + kern_hyp_va x2 + ldr w3, [x2, #KVM_TIMER_ENABLED] + cbz w3, 1f + + ldr x3, [x2, #KVM_TIMER_CNTVOFF] + msr cntvoff_el2, x3 + ldr x2, [x0, #VCPU_TIMER_CNTV_CVAL] + msr cntv_cval_el0, x2 + isb + + ldr w2, [x0, #VCPU_TIMER_CNTV_CTL] + and x2, x2, #3 + msr cntv_ctl_el0, x2 +1: +.endm + __save_sysregs: save_sysregs ret @@ -433,6 +487,7 @@ ENTRY(__kvm_vcpu_run) activate_vm restore_vgic_state + restore_timer_state // Guest context add x2, x0, #VCPU_CONTEXT @@ -455,6 +510,7 @@ __kvm_vcpu_return: bl __save_fpsimd bl __save_sysregs + save_timer_state save_vgic_state deactivate_traps diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c index f6536a06231a..766150ac76ed 100644 --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -23,6 +23,8 @@ #include #include +#include + #include #include #include @@ -36,6 +38,11 @@ static const struct kvm_regs default_regs_reset = { PSR_F_BIT | PSR_D_BIT), }; +static const struct kvm_irq_level default_vtimer_irq = { + .irq = 27, + .level = 1, +}; + int kvm_arch_dev_ioctl_check_extension(long ext) { int r; @@ -58,11 +65,13 @@ int kvm_arch_dev_ioctl_check_extension(long ext) */ int kvm_reset_vcpu(struct kvm_vcpu *vcpu) { + const struct kvm_irq_level *cpu_vtimer_irq; const struct kvm_regs *cpu_reset; switch (vcpu->arch.target) { default: cpu_reset = &default_regs_reset; + cpu_vtimer_irq = &default_vtimer_irq; break; } @@ -72,5 +81,8 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu) /* Reset system registers */ kvm_reset_sys_regs(vcpu); + /* Reset timer */ + kvm_timer_vcpu_reset(vcpu, cpu_vtimer_irq); + return 0; } -- cgit v1.2.3