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Subject[PATCH 8/13] KVM: Add host hypercall support for vmx
From
Date
From: Ingo Molnar <mingo@elte.hu>

Signed-off-by: Avi Kivity <avi@qumranet.com>

Index: linux-2.6/include/linux/kvm_para.h
===================================================================
--- linux-2.6.orig/include/linux/kvm_para.h
+++ linux-2.6/include/linux/kvm_para.h
@@ -52,4 +52,22 @@ struct kvm_vcpu_para_state {

#define KVM_EINVAL 1

+/*
+ * 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
+
#endif
Index: linux-2.6/drivers/kvm/vmx.c
===================================================================
--- linux-2.6.orig/drivers/kvm/vmx.c
+++ linux-2.6/drivers/kvm/vmx.c
@@ -1657,6 +1657,20 @@ static int handle_halt(struct kvm_vcpu *
return 0;
}

+static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
+{
+ kvm_run->exit_reason = KVM_EXIT_DEBUG;
+ printk(KERN_DEBUG "got vmcall at RIP %08lx\n", vmcs_readl(GUEST_RIP));
+ printk(KERN_DEBUG "vmcall params: %08lx, %08lx, %08lx, %08lx\n",
+ vcpu->regs[VCPU_REGS_RAX],
+ vcpu->regs[VCPU_REGS_RCX],
+ vcpu->regs[VCPU_REGS_RDX],
+ vcpu->regs[VCPU_REGS_RBP]);
+ vcpu->regs[VCPU_REGS_RAX] = 0;
+ vmcs_writel(GUEST_RIP, vmcs_readl(GUEST_RIP)+3);
+ return 1;
+}
+
/*
* The exit handlers return 1 if the exit was handled fully and guest execution
* may resume. Otherwise they set the kvm_run parameter to indicate what needs
@@ -1675,6 +1689,7 @@ static int (*kvm_vmx_exit_handlers[])(st
[EXIT_REASON_MSR_WRITE] = handle_wrmsr,
[EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window,
[EXIT_REASON_HLT] = handle_halt,
+ [EXIT_REASON_VMCALL] = handle_vmcall,
};

static const int kvm_vmx_max_exit_handlers =
-
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