[Xen-devel] [RFC XEN PATCH 09/23] riscv: Add domain.c

[Bobby Eshleman <bobbyeshleman@gmail.com>]

From: Alistair Francis <alistair.francis@wdc.com>

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 xen/arch/riscv/domain.c | 273 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 273 insertions(+)
 create mode 100644 xen/arch/riscv/domain.c

diff --git a/xen/arch/riscv/domain.c b/xen/arch/riscv/domain.c
new file mode 100644
index 0000000000..206366abf7
--- /dev/null
+++ b/xen/arch/riscv/domain.c
@@ -0,0 +1,273 @@
+/******************************************************************************
+ *
+ * Copyright 2019 (C) Alistair Francis <alistair.francis@wdc.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#include <xen/bitops.h>
+#include <xen/errno.h>
+#include <xen/grant_table.h>
+#include <xen/hypercall.h>
+#include <xen/init.h>
+#include <xen/lib.h>
+#include <xen/livepatch.h>
+#include <xen/sched.h>
+#include <xen/softirq.h>
+#include <xen/wait.h>
+
+DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
+
+static void do_idle(void)
+{
+    unsigned int cpu = smp_processor_id();
+
+    sched_tick_suspend();
+    /* sched_tick_suspend() can raise TIMER_SOFTIRQ. Process it now. */
+    process_pending_softirqs();
+
+    local_irq_disable();
+    if ( cpu_is_haltable(cpu) )
+    {
+        wait_for_interrupt();
+    }
+    local_irq_enable();
+
+    sched_tick_resume();
+}
+
+void idle_loop(void)
+{
+    unsigned int cpu = smp_processor_id();
+
+    for ( ; ; )
+    {
+        if ( cpu_is_offline(cpu) )
+            stop_cpu();
+
+        /* Are we here for running vcpu context tasklets, or for idling? */
+        if ( unlikely(tasklet_work_to_do(cpu)) )
+            do_tasklet();
+        /*
+         * Test softirqs twice --- first to see if should even try scrubbing
+         * and then, after it is done, whether softirqs became pending
+         * while we were scrubbing.
+         */
+        else if ( !softirq_pending(cpu) && !scrub_free_pages() &&
+                  !softirq_pending(cpu) )
+            do_idle();
+
+        do_softirq();
+        /*
+         * We MUST be last (or before dsb, wfi). Otherwise after we get the
+         * softirq we would execute dsb,wfi (and sleep) and not patch.
+         */
+        check_for_livepatch_work();
+    }
+}
+
+
+void context_switch(struct vcpu *prev, struct vcpu *next)
+{
+    ASSERT(local_irq_is_enabled());
+    ASSERT(prev != next);
+    ASSERT(!vcpu_cpu_dirty(next));
+
+    local_irq_disable();
+
+    /* TODO */
+
+    set_current(next);
+}
+
+void continue_running(struct vcpu *same)
+{
+    /* Nothing to do */
+}
+
+void sync_local_execstate(void)
+{
+    /* Nothing to do -- no lazy switching */
+}
+
+void sync_vcpu_execstate(struct vcpu *v)
+{
+    /* Nothing to do -- no lazy switching */
+}
+
+unsigned long hypercall_create_continuation(
+    unsigned int op, const char *format, ...)
+{
+	/* TODO */
+
+	return 0;
+}
+
+void startup_cpu_idle_loop(void)
+{
+    struct vcpu *v = current;
+
+    ASSERT(is_idle_vcpu(v));
+
+    reset_stack_and_jump(idle_loop);
+}
+
+struct domain *alloc_domain_struct(void)
+{
+    struct domain *d;
+    BUILD_BUG_ON(sizeof(*d) > PAGE_SIZE);
+    d = alloc_xenheap_pages(0, 0);
+    if ( d == NULL )
+        return NULL;
+
+    clear_page(d);
+    return d;
+}
+
+void free_domain_struct(struct domain *d)
+{
+    free_xenheap_page(d);
+}
+
+void dump_pageframe_info(struct domain *d)
+{
+
+}
+
+int arch_sanitise_domain_config(struct xen_domctl_createdomain *config)
+{
+    /* TODO */
+
+    return 0;
+}
+
+
+int arch_domain_create(struct domain *d,
+                       struct xen_domctl_createdomain *config)
+{
+    /* TODO */
+
+    return 0;
+}
+
+void arch_domain_destroy(struct domain *d)
+{
+}
+
+void arch_domain_shutdown(struct domain *d)
+{
+}
+
+void arch_domain_pause(struct domain *d)
+{
+}
+
+void arch_domain_unpause(struct domain *d)
+{
+}
+
+int arch_domain_soft_reset(struct domain *d)
+{
+    return -ENOSYS;
+}
+
+void arch_domain_creation_finished(struct domain *d)
+{
+    /* TODO */
+}
+
+int domain_relinquish_resources(struct domain *d)
+{
+    /* TODO */
+
+    return 0;
+}
+
+void arch_dump_domain_info(struct domain *d)
+{
+    p2m_dump_info(d);
+}
+
+long arch_do_vcpu_op(int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg)
+{
+    return -ENOSYS;
+}
+
+void arch_dump_vcpu_info(struct vcpu *v)
+{
+    /* TODO */
+}
+
+int arch_set_info_guest(
+    struct vcpu *v, vcpu_guest_context_u c)
+{
+    /* TODO */
+
+    return 0;
+}
+
+#define MAX_PAGES_PER_VCPU  2
+
+struct vcpu *alloc_vcpu_struct(const struct domain *d)
+{
+    struct vcpu *v;
+
+    BUILD_BUG_ON(sizeof(*v) > MAX_PAGES_PER_VCPU * PAGE_SIZE);
+    v = alloc_xenheap_pages(get_order_from_bytes(sizeof(*v)), 0);
+    if ( v != NULL )
+    {
+        unsigned int i;
+
+        for ( i = 0; i < DIV_ROUND_UP(sizeof(*v), PAGE_SIZE); i++ )
+            clear_page((void *)v + i * PAGE_SIZE);
+    }
+
+    return v;
+}
+
+void free_vcpu_struct(struct vcpu *v)
+{
+    free_xenheap_pages(v, get_order_from_bytes(sizeof(*v)));
+}
+
+int arch_initialise_vcpu(struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg)
+{
+    return default_initialise_vcpu(v, arg);
+}
+
+int arch_vcpu_reset(struct vcpu *v)
+{
+    /* TODO */
+    return 0;
+}
+
+int arch_vcpu_create(struct vcpu *v)
+{
+    int rc = 0;
+
+    /* TODO */
+
+    return rc;
+}
+
+void arch_vcpu_destroy(struct vcpu *v)
+{
+    /* TODO */
+}
-- 
2.25.0


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