arm64: KVM: kvm_arch and kvm_vcpu_arch definitions

Provide the architecture dependent structures for VM and
vcpu abstractions.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 186 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
new file mode 100644
index 000000000000..4a2622f5e81f
--- /dev/null
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/include/asm/kvm_host.h:
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ARM64_KVM_HOST_H__
+#define __ARM64_KVM_HOST_H__
+
+#include <asm/kvm.h>
+#include <asm/kvm_asm.h>
+#include <asm/kvm_mmio.h>
+
+#define KVM_MAX_VCPUS 4
+#define KVM_USER_MEM_SLOTS 32
+#define KVM_PRIVATE_MEM_SLOTS 4
+#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
+
+#include <kvm/arm_vgic.h>
+#include <kvm/arm_arch_timer.h>
+
+#define KVM_VCPU_MAX_FEATURES 0
+
+/* We don't currently support large pages. */
+#define KVM_HPAGE_GFN_SHIFT(x)  0
+#define KVM_NR_PAGE_SIZES       1
+#define KVM_PAGES_PER_HPAGE(x)  (1UL<<31)
+
+struct kvm_vcpu;
+int kvm_target_cpu(void);
+int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
+int kvm_arch_dev_ioctl_check_extension(long ext);
+
+struct kvm_arch {
+        /* The VMID generation used for the virt. memory system */
+        u64    vmid_gen;
+        u32    vmid;
+
+        /* 1-level 2nd stage table and lock */
+        spinlock_t pgd_lock;
+        pgd_t *pgd;
+
+        /* VTTBR value associated with above pgd and vmid */
+        u64    vttbr;
+
+        /* Interrupt controller */
+        struct vgic_dist        vgic;
+
+        /* Timer */
+        struct arch_timer_kvm   timer;
+};
+
+#define KVM_NR_MEM_OBJS     40
+
+/*
+ * We don't want allocation failures within the mmu code, so we preallocate
+ * enough memory for a single page fault in a cache.
+ */
+struct kvm_mmu_memory_cache {
+        int nobjs;
+        void *objects[KVM_NR_MEM_OBJS];
+};
+
+struct kvm_vcpu_fault_info {
+        u32 esr_el2;            /* Hyp Syndrom Register */
+        u64 far_el2;            /* Hyp Fault Address Register */
+        u64 hpfar_el2;          /* Hyp IPA Fault Address Register */
+};
+
+struct kvm_cpu_context {
+        struct kvm_regs gp_regs;
+        u64 sys_regs[NR_SYS_REGS];
+};
+
+typedef struct kvm_cpu_context kvm_cpu_context_t;
+
+struct kvm_vcpu_arch {
+        struct kvm_cpu_context ctxt;
+
+        /* HYP configuration */
+        u64 hcr_el2;
+
+        /* Exception Information */
+        struct kvm_vcpu_fault_info fault;
+
+        /* Pointer to host CPU context */
+        kvm_cpu_context_t *host_cpu_context;
+
+        /* VGIC state */
+        struct vgic_cpu vgic_cpu;
+        struct arch_timer_cpu timer_cpu;
+
+        /*
+         * Anything that is not used directly from assembly code goes
+         * here.
+         */
+        /* dcache set/way operation pending */
+        int last_pcpu;
+        cpumask_t require_dcache_flush;
+
+        /* Don't run the guest */
+        bool pause;
+
+        /* IO related fields */
+        struct kvm_decode mmio_decode;
+
+        /* Interrupt related fields */
+        u64 irq_lines;          /* IRQ and FIQ levels */
+
+        /* Cache some mmu pages needed inside spinlock regions */
+        struct kvm_mmu_memory_cache mmu_page_cache;
+
+        /* Target CPU and feature flags */
+        u32 target;
+        DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
+
+        /* Detect first run of a vcpu */
+        bool has_run_once;
+};
+
+#define vcpu_gp_regs(v)         (&(v)->arch.ctxt.gp_regs)
+#define vcpu_sys_reg(v,r)       ((v)->arch.ctxt.sys_regs[(r)])
+#define vcpu_cp15(v,r)          ((v)->arch.ctxt.cp15[(r)])
+
+struct kvm_vm_stat {
+        u32 remote_tlb_flush;
+};
+
+struct kvm_vcpu_stat {
+        u32 halt_wakeup;
+};
+
+struct kvm_vcpu_init;
+int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
+                        const struct kvm_vcpu_init *init);
+unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
+int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
+struct kvm_one_reg;
+int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
+int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
+
+#define KVM_ARCH_WANT_MMU_NOTIFIER
+struct kvm;
+int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
+int kvm_unmap_hva_range(struct kvm *kvm,
+                        unsigned long start, unsigned long end);
+void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
+
+/* We do not have shadow page tables, hence the empty hooks */
+static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva)
+{
+        return 0;
+}
+
+static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
+{
+        return 0;
+}
+
+struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
+struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
+
+u64 kvm_call_hyp(void *hypfn, ...);
+
+int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
+                int exception_index);
+
+int kvm_perf_init(void);
+int kvm_perf_teardown(void);
+
+#endif /* __ARM64_KVM_HOST_H__ */