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    Subject[PATCH 13/41] KVM: Allow userspace to process hypercalls which have no kernel handler
    Date
    This is useful for paravirtualized graphics devices, for example.

    Signed-off-by: Avi Kivity <avi@qumranet.com>
    ---
    drivers/kvm/kvm_main.c | 18 +++++++++++++++++-
    include/linux/kvm.h | 10 +++++++++-
    2 files changed, 26 insertions(+), 2 deletions(-)

    diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
    index 39cf8fd..de93117 100644
    --- a/drivers/kvm/kvm_main.c
    +++ b/drivers/kvm/kvm_main.c
    @@ -1203,7 +1203,16 @@ int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
    }
    switch (nr) {
    default:
    - ;
    + run->hypercall.args[0] = a0;
    + run->hypercall.args[1] = a1;
    + run->hypercall.args[2] = a2;
    + run->hypercall.args[3] = a3;
    + run->hypercall.args[4] = a4;
    + run->hypercall.args[5] = a5;
    + run->hypercall.ret = ret;
    + run->hypercall.longmode = is_long_mode(vcpu);
    + kvm_arch_ops->decache_regs(vcpu);
    + return 0;
    }
    vcpu->regs[VCPU_REGS_RAX] = ret;
    kvm_arch_ops->decache_regs(vcpu);
    @@ -1599,6 +1608,13 @@ static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)

    vcpu->mmio_needed = 0;

    + if (kvm_run->exit_type == KVM_EXIT_TYPE_VM_EXIT
    + && kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
    + kvm_arch_ops->cache_regs(vcpu);
    + vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
    + kvm_arch_ops->decache_regs(vcpu);
    + }
    +
    r = kvm_arch_ops->run(vcpu, kvm_run);

    vcpu_put(vcpu);
    diff --git a/include/linux/kvm.h b/include/linux/kvm.h
    index c93cf53..9151ebf 100644
    --- a/include/linux/kvm.h
    +++ b/include/linux/kvm.h
    @@ -11,7 +11,7 @@
    #include <asm/types.h>
    #include <linux/ioctl.h>

    -#define KVM_API_VERSION 6
    +#define KVM_API_VERSION 7

    /*
    * Architectural interrupt line count, and the size of the bitmap needed
    @@ -41,6 +41,7 @@ enum kvm_exit_reason {
    KVM_EXIT_UNKNOWN = 0,
    KVM_EXIT_EXCEPTION = 1,
    KVM_EXIT_IO = 2,
    + KVM_EXIT_HYPERCALL = 3,
    KVM_EXIT_DEBUG = 4,
    KVM_EXIT_HLT = 5,
    KVM_EXIT_MMIO = 6,
    @@ -103,6 +104,13 @@ struct kvm_run {
    __u32 len;
    __u8 is_write;
    } mmio;
    + /* KVM_EXIT_HYPERCALL */
    + struct {
    + __u64 args[6];
    + __u64 ret;
    + __u32 longmode;
    + __u32 pad;
    + } hypercall;
    };
    };

    --
    1.5.0.5
    -
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