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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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