[Xen-devel] [PATCH v5 8/9] xen/x86: Setup PVHv2 Dom0 CPUs

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Initialize Dom0 BSP/APs and setup the memory and IO permissions. This also sets
the initial BSP state in order to match the protocol specified in
hvm/start_info.h.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
---
 xen/arch/x86/domain_build.c | 60 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/xen/arch/x86/domain_build.c b/xen/arch/x86/domain_build.c
index 55caa30..ca5d393 100644
--- a/xen/arch/x86/domain_build.c
+++ b/xen/arch/x86/domain_build.c
@@ -41,6 +41,7 @@
 #include <public/version.h>
 #include <public/arch-x86/hvm/start_info.h>
 #include <public/hvm/hvm_info_table.h>
+#include <public/hvm/hvm_vcpu.h>
 
 static long __initdata dom0_nrpages;
 static long __initdata dom0_min_nrpages;
@@ -2096,6 +2097,56 @@ static int __init pvh_load_kernel(struct domain *d, 
const module_t *image,
     return 0;
 }
 
+static int __init pvh_setup_cpus(struct domain *d, paddr_t entry,
+                                 paddr_t start_info)
+{
+    vcpu_hvm_context_t cpu_ctx;
+    struct vcpu *v = d->vcpu[0];
+    int cpu, i, rc;
+
+    cpu = v->processor;
+    for ( i = 1; i < d->max_vcpus; i++ )
+    {
+        cpu = cpumask_cycle(cpu, &dom0_cpus);
+        setup_dom0_vcpu(d, i, cpu);
+    }
+
+    memset(&cpu_ctx, 0, sizeof(cpu_ctx));
+
+    cpu_ctx.mode = VCPU_HVM_MODE_32B;
+
+    cpu_ctx.cpu_regs.x86_32.ebx = start_info;
+    cpu_ctx.cpu_regs.x86_32.eip = entry;
+    cpu_ctx.cpu_regs.x86_32.cr0 = X86_CR0_PE | X86_CR0_ET;
+
+    cpu_ctx.cpu_regs.x86_32.cs_limit = ~0u;
+    cpu_ctx.cpu_regs.x86_32.ds_limit = ~0u;
+    cpu_ctx.cpu_regs.x86_32.ss_limit = ~0u;
+    cpu_ctx.cpu_regs.x86_32.tr_limit = 0x67;
+    cpu_ctx.cpu_regs.x86_32.cs_ar = 0xc9b;
+    cpu_ctx.cpu_regs.x86_32.ds_ar = 0xc93;
+    cpu_ctx.cpu_regs.x86_32.ss_ar = 0xc93;
+    cpu_ctx.cpu_regs.x86_32.tr_ar = 0x8b;
+
+    rc = arch_set_info_hvm_guest(v, &cpu_ctx);
+    if ( rc )
+    {
+        printk("Unable to setup Dom0 BSP context: %d\n", rc);
+        return rc;
+    }
+
+    rc = setup_permissions(d);
+    if ( rc )
+    {
+        panic("Unable to setup Dom0 permissions: %d\n", rc);
+        return rc;
+    }
+
+    update_domain_wallclock_time(d);
+
+    return 0;
+}
+
 static int __init construct_dom0_pvh(struct domain *d, const module_t *image,
                                      unsigned long image_headroom,
                                      module_t *initrd,
@@ -2124,6 +2175,15 @@ static int __init construct_dom0_pvh(struct domain *d, 
const module_t *image,
         return rc;
     }
 
+    rc = pvh_setup_cpus(d, entry, start_info);
+    if ( rc )
+    {
+        printk("Failed to setup Dom0 CPUs: %d\n", rc);
+        return rc;
+    }
+
+    clear_bit(_VPF_down, &d->vcpu[0]->pause_flags);
+
     return 0;
 }
 
-- 
2.10.1 (Apple Git-78)


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