Dev Passthrough QEMU patch

index c15ff6c..0c19214 100644
@@ -737,6 +737,26 @@ static void *qemu_kvm_cpu_thread_fn(void *arg)
     CPUState *cpu = ENV_GET_CPU(env);
     int r;
 
+    /* For now just do a 1:1 vCPU binding as they come online for device
+     * pass through
+     */
+    cpu_set_t cpuset;
+    int ret, i;
+    unsigned long cpu_index = kvm_arch_vcpu_id(cpu);
+
+    CPU_ZERO(&cpuset);
+    CPU_SET(cpu_index, &cpuset);
+    ret = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
+    if(ret != 0) {
+    	printf("pthread_setaffinity_np failed to setaffinity to CPU 0\n");
+        exit(-1);
+    }
+    
+    CPU_ZERO(&cpuset);
+    pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpuset);
+    if(CPU_ISSET(cpu_index,&cpuset))
+        printf("Binding: vCPU %ld --> CPU %d\n", cpu_index, i);
+
     qemu_mutex_lock(&qemu_global_mutex);
     qemu_thread_get_self(cpu->thread);
     cpu->thread_id = qemu_get_thread_id();

index caca979..46c2c59 100644
@@ -904,6 +904,8 @@ struct kvm_s390_ucas_mapping {
 #define KVM_PPC_GET_HTAB_FD	  _IOW(KVMIO,  0xaa, struct kvm_get_htab_fd)
 /* Available with KVM_CAP_ARM_SET_DEVICE_ADDR */
 #define KVM_ARM_SET_DEVICE_ADDR	  _IOW(KVMIO,  0xab, struct kvm_arm_device_addr)
+#define KVM_ARM_GET_DEVICE_RESOURCES _IOW(KVMIO,  0xe1, struct kvm_arm_get_device_resources)
+#define KVM_ARM_ASSIGN_DEVICE	  _IOW(KVMIO,  0xe2, struct kvm_arm_assigned_device)
 
 /*
  * ioctls for vcpu fds

@@ -1013,6 +1015,7 @@ struct kvm_assigned_irq {
 	};
 };
 
+
 struct kvm_assigned_msix_nr {
 	__u32 assigned_dev_id;
 	__u16 entry_nr;

@@ -1027,4 +1030,33 @@ struct kvm_assigned_msix_entry {
 	__u16 padding[3];
 };
 
+
+/* MAX 6 MMIO resources per device */
+#define MAX_RES_PER_DEVICE      6
+struct kvm_arm_get_device_resources {
+        char    devname[128];
+        __u32   resource_cnt;
+        struct {
+                __u64   hpa;
+                __u32   size;
+                __u32   attr;
+		char    host_name[64];
+        } host_resources[MAX_RES_PER_DEVICE];
+	struct {
+		__u32	hwirq;
+		__u32	attr;	
+		char    host_name[64];
+	} hostirq;
+};
+
+struct kvm_guest_device_resources {
+        __u64   gpa[MAX_RES_PER_DEVICE];
+        __u32   girq;
+};
+
+struct kvm_arm_assigned_device {
+        struct  kvm_arm_get_device_resources dev_res;
+        struct  kvm_guest_device_resources guest_res;
+};
+
 #endif /* __LINUX_KVM_H */

118 lines not on this page · raw message

index d8acace..5e9bcd0 100644
@@ -22,6 +22,7 @@
 #include "kvm_arm.h"
 #include "cpu.h"
 #include "hw/arm/arm.h"
+#include "qemu/error-report.h"
 
 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
     KVM_CAP_LAST_INFO

index b1c54ff..8cb94e3 100644
@@ -29,4 +29,6 @@
  */
 void kvm_arm_register_device(MemoryRegion *mr, uint64_t devid);
 
+int kvm_device_assign(KVMState *s, char *, ...);
+
 #endif