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Date: Wed, 26 Dec 2007 13:05:11 +0200
From: Avi Kivity <avi@...ranet.com>
To: linux-kernel@...r.kernel.org, kvm-devel@...ts.sourceforge.net
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Subject: [PATCH 06/55] KVM: Per-architecture hypercall definitions
From: Christian Borntraeger <borntraeger@...ibm.com>
Currently kvm provides hypercalls only for x86* architectures. To
provide hypercall infrastructure for other kvm architectures I split
kvm_para.h into a generic header file and architecture specific
definitions.
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Avi Kivity <avi@...ranet.com>
---
include/asm-x86/kvm_para.h | 105 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/kvm_para.h | 105 +++++---------------------------------------
2 files changed, 117 insertions(+), 93 deletions(-)
create mode 100644 include/asm-x86/kvm_para.h
diff --git a/include/asm-x86/kvm_para.h b/include/asm-x86/kvm_para.h
new file mode 100644
index 0000000..c6f3fd8
--- /dev/null
+++ b/include/asm-x86/kvm_para.h
@@ -0,0 +1,105 @@
+#ifndef __X86_KVM_PARA_H
+#define __X86_KVM_PARA_H
+
+/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It
+ * should be used to determine that a VM is running under KVM.
+ */
+#define KVM_CPUID_SIGNATURE 0x40000000
+
+/* This CPUID returns a feature bitmap in eax. Before enabling a particular
+ * paravirtualization, the appropriate feature bit should be checked.
+ */
+#define KVM_CPUID_FEATURES 0x40000001
+
+#ifdef __KERNEL__
+#include <asm/processor.h>
+
+/* This instruction is vmcall. On non-VT architectures, it will generate a
+ * trap that we will then rewrite to the appropriate instruction.
+ */
+#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
+
+/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
+ * instruction. The hypervisor may replace it with something else but only the
+ * instructions are guaranteed to be supported.
+ *
+ * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
+ * The hypercall number should be placed in rax and the return value will be
+ * placed in rax. No other registers will be clobbered unless explicited
+ * noted by the particular hypercall.
+ */
+
+static inline long kvm_hypercall0(unsigned int nr)
+{
+ long ret;
+ asm volatile(KVM_HYPERCALL
+ : "=a"(ret)
+ : "a"(nr));
+ return ret;
+}
+
+static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
+{
+ long ret;
+ asm volatile(KVM_HYPERCALL
+ : "=a"(ret)
+ : "a"(nr), "b"(p1));
+ return ret;
+}
+
+static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
+ unsigned long p2)
+{
+ long ret;
+ asm volatile(KVM_HYPERCALL
+ : "=a"(ret)
+ : "a"(nr), "b"(p1), "c"(p2));
+ return ret;
+}
+
+static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
+ unsigned long p2, unsigned long p3)
+{
+ long ret;
+ asm volatile(KVM_HYPERCALL
+ : "=a"(ret)
+ : "a"(nr), "b"(p1), "c"(p2), "d"(p3));
+ return ret;
+}
+
+static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
+ unsigned long p2, unsigned long p3,
+ unsigned long p4)
+{
+ long ret;
+ asm volatile(KVM_HYPERCALL
+ : "=a"(ret)
+ : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
+ return ret;
+}
+
+static inline int kvm_para_available(void)
+{
+ unsigned int eax, ebx, ecx, edx;
+ char signature[13];
+
+ cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
+ memcpy(signature + 0, &ebx, 4);
+ memcpy(signature + 4, &ecx, 4);
+ memcpy(signature + 8, &edx, 4);
+ signature[12] = 0;
+
+ if (strcmp(signature, "KVMKVMKVM") == 0)
+ return 1;
+
+ return 0;
+}
+
+static inline unsigned int kvm_arch_para_features(void)
+{
+ return cpuid_eax(KVM_CPUID_FEATURES);
+}
+
+#endif
+
+#endif
diff --git a/include/linux/kvm_para.h b/include/linux/kvm_para.h
index cc5dfb4..e4db25f 100644
--- a/include/linux/kvm_para.h
+++ b/include/linux/kvm_para.h
@@ -1,110 +1,29 @@
#ifndef __LINUX_KVM_PARA_H
#define __LINUX_KVM_PARA_H
-/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It
- * should be used to determine that a VM is running under KVM.
+/*
+ * 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
*/
-#define KVM_CPUID_SIGNATURE 0x40000000
-
-/* This CPUID returns a feature bitmap in eax. Before enabling a particular
- * paravirtualization, the appropriate feature bit should be checked.
- */
-#define KVM_CPUID_FEATURES 0x40000001
/* Return values for hypercalls */
#define KVM_ENOSYS 1000
#ifdef __KERNEL__
-#include <asm/processor.h>
-
-/* This instruction is vmcall. On non-VT architectures, it will generate a
- * trap that we will then rewrite to the appropriate instruction.
- */
-#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
-
-/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
- * instruction. The hypervisor may replace it with something else but only the
- * instructions are guaranteed to be supported.
- *
- * Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
- * The hypercall number should be placed in rax and the return value will be
- * placed in rax. No other registers will be clobbered unless explicited
- * noted by the particular hypercall.
+/*
+ * hypercalls use architecture specific
*/
-
-static inline long kvm_hypercall0(unsigned int nr)
-{
- long ret;
- asm volatile(KVM_HYPERCALL
- : "=a"(ret)
- : "a"(nr));
- return ret;
-}
-
-static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
-{
- long ret;
- asm volatile(KVM_HYPERCALL
- : "=a"(ret)
- : "a"(nr), "b"(p1));
- return ret;
-}
-
-static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
- unsigned long p2)
-{
- long ret;
- asm volatile(KVM_HYPERCALL
- : "=a"(ret)
- : "a"(nr), "b"(p1), "c"(p2));
- return ret;
-}
-
-static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
- unsigned long p2, unsigned long p3)
-{
- long ret;
- asm volatile(KVM_HYPERCALL
- : "=a"(ret)
- : "a"(nr), "b"(p1), "c"(p2), "d"(p3));
- return ret;
-}
-
-static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
- unsigned long p2, unsigned long p3,
- unsigned long p4)
-{
- long ret;
- asm volatile(KVM_HYPERCALL
- : "=a"(ret)
- : "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
- return ret;
-}
-
-static inline int kvm_para_available(void)
-{
- unsigned int eax, ebx, ecx, edx;
- char signature[13];
-
- cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
- memcpy(signature + 0, &ebx, 4);
- memcpy(signature + 4, &ecx, 4);
- memcpy(signature + 8, &edx, 4);
- signature[12] = 0;
-
- if (strcmp(signature, "KVMKVMKVM") == 0)
- return 1;
-
- return 0;
-}
+#include <asm/kvm_para.h>
static inline int kvm_para_has_feature(unsigned int feature)
{
- if (cpuid_eax(KVM_CPUID_FEATURES) & (1UL << feature))
+ if (kvm_arch_para_features() & (1UL << feature))
return 1;
return 0;
}
+#endif /* __KERNEL__ */
+#endif /* __LINUX_KVM_PARA_H */
-#endif
-
-#endif
--
1.5.3.7
--
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