KVM: add MSR based hypercall API

This adds a special MSR based hypercall API to KVM. This is to be
used by paravirtual kernels and virtual drivers.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 9a49b2ed2a1e..fd7746a2bc3e 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -14,6 +14,7 @@
 
 #include "vmx.h"
 #include <linux/kvm.h>
+#include <linux/kvm_para.h>
 
 #define CR0_PE_MASK (1ULL << 0)
 #define CR0_TS_MASK (1ULL << 3)
@@ -237,6 +238,9 @@ struct kvm_vcpu {
         unsigned long cr0;
         unsigned long cr2;
         unsigned long cr3;
+        gpa_t para_state_gpa;
+        struct page *para_state_page;
+        gpa_t hypercall_gpa;
         unsigned long cr4;
         unsigned long cr8;
         u64 pdptrs[4]; /* pae */
@@ -382,6 +386,8 @@ struct kvm_arch_ops {
         int (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
         int (*vcpu_setup)(struct kvm_vcpu *vcpu);
         void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
+        void (*patch_hypercall)(struct kvm_vcpu *vcpu,
+                                unsigned char *hypercall_addr);
 };
 
 extern struct kvm_stat kvm_stat;