From a2c046e40ff16ef6c20d534b0d77d526bc02a684 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Fri, 18 Nov 2016 13:14:37 +0000 Subject: [PATCH] KVM: MIPS: Add vcpu_run() & vcpu_reenter() callbacks MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Add implementation callbacks for entering the guest (vcpu_run()) and reentering the guest (vcpu_reenter()), allowing implementation specific operations to be performed before entering the guest or after returning to the host without cluttering kvm_arch_vcpu_ioctl_run(). This allows the T&E specific lazy user GVA flush to be moved into trap_emul.c, along with disabling of the HTW. We also move kvm_mips_deliver_interrupts() as VZ will need to restore the guest timer state prior to delivering interrupts. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org --- arch/mips/include/asm/kvm_host.h | 2 ++ arch/mips/kvm/mips.c | 43 ++-------------------------- arch/mips/kvm/trap_emul.c | 48 ++++++++++++++++++++++++++++++++ 3 files changed, 52 insertions(+), 41 deletions(-) diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 923f81dc6115..9f319375835a 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -539,6 +539,8 @@ struct kvm_mips_callbacks { const struct kvm_one_reg *reg, s64 v); int (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu); int (*vcpu_put)(struct kvm_vcpu *vcpu, int cpu); + int (*vcpu_run)(struct kvm_run *run, struct kvm_vcpu *vcpu); + void (*vcpu_reenter)(struct kvm_run *run, struct kvm_vcpu *vcpu); }; extern struct kvm_mips_callbacks *kvm_mips_callbacks; int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks); diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index 85bc54f35695..1733877d8a53 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -410,32 +410,6 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, return -ENOIOCTLCMD; } -/* Must be called with preemption disabled, just before entering guest */ -static void kvm_mips_check_asids(struct kvm_vcpu *vcpu) -{ - struct mm_struct *user_mm = &vcpu->arch.guest_user_mm; - struct mips_coproc *cop0 = vcpu->arch.cop0; - int i, cpu = smp_processor_id(); - unsigned int gasid; - - /* - * Lazy host ASID regeneration for guest user mode. - * If the guest ASID has changed since the last guest usermode - * execution, regenerate the host ASID so as to invalidate stale TLB - * entries. - */ - if (!KVM_GUEST_KERNEL_MODE(vcpu)) { - gasid = kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID; - if (gasid != vcpu->arch.last_user_gasid) { - kvm_get_new_mmu_context(user_mm, cpu, vcpu); - for_each_possible_cpu(i) - if (i != cpu) - cpu_context(i, user_mm) = 0; - vcpu->arch.last_user_gasid = gasid; - } - } -} - int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) { int r = 0; @@ -453,25 +427,12 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) lose_fpu(1); local_irq_disable(); - /* Check if we have any exceptions/interrupts pending */ - kvm_mips_deliver_interrupts(vcpu, - kvm_read_c0_guest_cause(vcpu->arch.cop0)); - guest_enter_irqoff(); - - /* Disable hardware page table walking while in guest */ - htw_stop(); - trace_kvm_enter(vcpu); - kvm_mips_check_asids(vcpu); + r = kvm_mips_callbacks->vcpu_run(run, vcpu); - r = vcpu->arch.vcpu_run(run, vcpu); trace_kvm_out(vcpu); - - /* Re-enable HTW before enabling interrupts */ - htw_start(); - guest_exit_irqoff(); local_irq_enable(); @@ -1570,7 +1531,7 @@ skip_emul: if (ret == RESUME_GUEST) { trace_kvm_reenter(vcpu); - kvm_mips_check_asids(vcpu); + kvm_mips_callbacks->vcpu_reenter(run, vcpu); /* * If FPU / MSA are enabled (i.e. the guest's FPU / MSA context diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index c7854d32fd64..92734d095c94 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -692,6 +692,52 @@ static int kvm_trap_emul_vcpu_put(struct kvm_vcpu *vcpu, int cpu) return 0; } +static void kvm_trap_emul_vcpu_reenter(struct kvm_run *run, + struct kvm_vcpu *vcpu) +{ + struct mm_struct *user_mm = &vcpu->arch.guest_user_mm; + struct mips_coproc *cop0 = vcpu->arch.cop0; + int i, cpu = smp_processor_id(); + unsigned int gasid; + + /* + * Lazy host ASID regeneration for guest user mode. + * If the guest ASID has changed since the last guest usermode + * execution, regenerate the host ASID so as to invalidate stale TLB + * entries. + */ + if (!KVM_GUEST_KERNEL_MODE(vcpu)) { + gasid = kvm_read_c0_guest_entryhi(cop0) & KVM_ENTRYHI_ASID; + if (gasid != vcpu->arch.last_user_gasid) { + kvm_get_new_mmu_context(user_mm, cpu, vcpu); + for_each_possible_cpu(i) + if (i != cpu) + cpu_context(i, user_mm) = 0; + vcpu->arch.last_user_gasid = gasid; + } + } +} + +static int kvm_trap_emul_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu) +{ + int r; + + /* Check if we have any exceptions/interrupts pending */ + kvm_mips_deliver_interrupts(vcpu, + kvm_read_c0_guest_cause(vcpu->arch.cop0)); + + kvm_trap_emul_vcpu_reenter(run, vcpu); + + /* Disable hardware page table walking while in guest */ + htw_stop(); + + r = vcpu->arch.vcpu_run(run, vcpu); + + htw_start(); + + return r; +} + static struct kvm_mips_callbacks kvm_trap_emul_callbacks = { /* exit handlers */ .handle_cop_unusable = kvm_trap_emul_handle_cop_unusable, @@ -724,6 +770,8 @@ static struct kvm_mips_callbacks kvm_trap_emul_callbacks = { .set_one_reg = kvm_trap_emul_set_one_reg, .vcpu_load = kvm_trap_emul_vcpu_load, .vcpu_put = kvm_trap_emul_vcpu_put, + .vcpu_run = kvm_trap_emul_vcpu_run, + .vcpu_reenter = kvm_trap_emul_vcpu_reenter, }; int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks) -- 2.20.1