MAINTAINERS - Add missing "/" to some pattern directories

[sfrench/cifs-2.6.git] / include / linux / kvm_para.h

diff --git a/include/linux/kvm_para.h b/include/linux/kvm_para.h
index 3b292565a693c2363283b50fdac72880e5cca0b2..3ddce03766caf5796f84f71bd7462f117c9a064a 100644 (file)
--- a/include/linux/kvm_para.h
+++ b/include/linux/kvm_para.h
@@ -2,72 +2,39 @@
 #define __LINUX_KVM_PARA_H
 
 /*
- * Guest OS interface for KVM paravirtualization
- *
- * Note: this interface is totally experimental, and is certain to change
- *       as we make progress.
+ * This header file provides a method for making a hypercall to the host
+ * Architectures should define:
+ * - kvm_hypercall0, kvm_hypercall1...
+ * - kvm_arch_para_features
+ * - kvm_para_available
  */
 
-/*
- * Per-VCPU descriptor area shared between guest and host. Writable to
- * both guest and host. Registered with the host by the guest when
- * a guest acknowledges paravirtual mode.
- *
- * NOTE: all addresses are guest-physical addresses (gpa), to make it
- * easier for the hypervisor to map between the various addresses.
- */
-struct kvm_vcpu_para_state {
-       /*
-        * API version information for compatibility. If there's any support
-        * mismatch (too old host trying to execute too new guest) then
-        * the host will deny entry into paravirtual mode. Any other
-        * combination (new host + old guest and new host + new guest)
-        * is supposed to work - new host versions will support all old
-        * guest API versions.
-        */
-       u32 guest_version;
-       u32 host_version;
-       u32 size;
-       u32 ret;
-
-       /*
-        * The address of the vm exit instruction (VMCALL or VMMCALL),
-        * which the host will patch according to the CPU model the
-        * VM runs on:
-        */
-       u64 hypercall_gpa;
-
-} __attribute__ ((aligned(PAGE_SIZE)));
+/* Return values for hypercalls */
+#define KVM_ENOSYS             1000
+#define KVM_EFAULT             EFAULT
+#define KVM_E2BIG              E2BIG
 
-#define KVM_PARA_API_VERSION 1
+#define KVM_HC_VAPIC_POLL_IRQ          1
+#define KVM_HC_MMU_OP                  2
 
 /*
- * This is used for an RDMSR's ECX parameter to probe for a KVM host.
- * Hopefully no CPU vendor will use up this number. This is placed well
- * out of way of the typical space occupied by CPU vendors' MSR indices,
- * and we think (or at least hope) it wont be occupied in the future
- * either.
+ * hypercalls use architecture specific
  */
-#define MSR_KVM_API_MAGIC 0x87655678
+#include <asm/kvm_para.h>
 
-#define KVM_EINVAL 1
+#ifdef __KERNEL__
+#ifdef CONFIG_KVM_GUEST
+void __init kvm_guest_init(void);
+#else
+#define kvm_guest_init() do { } while (0)
+#endif
 
-/*
- * Hypercall calling convention:
- *
- * Each hypercall may have 0-6 parameters.
- *
- * 64-bit hypercall index is in RAX, goes from 0 to __NR_hypercalls-1
- *
- * 64-bit parameters 1-6 are in the standard gcc x86_64 calling convention
- * order: RDI, RSI, RDX, RCX, R8, R9.
- *
- * 32-bit index is EBX, parameters are: EAX, ECX, EDX, ESI, EDI, EBP.
- * (the first 3 are according to the gcc regparm calling convention)
- *
- * No registers are clobbered by the hypercall, except that the
- * return value is in RAX.
- */
-#define __NR_hypercalls                        0
+static inline int kvm_para_has_feature(unsigned int feature)
+{
+       if (kvm_arch_para_features() & (1UL << feature))
+               return 1;
+       return 0;
+}
+#endif /* __KERNEL__ */
+#endif /* __LINUX_KVM_PARA_H */
 
-#endif