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 <james.hogan@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: "Radim Krčmář" <rkrcmar@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
---
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 155e1b36e87e..982fe31a952e 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();
@@ -1575,7 +1536,7 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
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)
--
git-series 0.8.10
