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| author | Avi Kivity <avi@qumranet.com> | 2007-03-04 12:59:30 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-05-03 09:52:24 +0200 |
| commit | b4e63f560beb187cffdaf706e534a1e2f9effb66 (patch) | |
| tree | 1fe1a640530af04d1d722e0c99c8086b0e13f1e7 | |
| parent | KVM: Add method to check for backwards-compatible API extensions (diff) | |
| download | linux-b4e63f560beb187cffdaf706e534a1e2f9effb66.tar.xz linux-b4e63f560beb187cffdaf706e534a1e2f9effb66.zip | |
KVM: Allow userspace to process hypercalls which have no kernel handler
This is useful for paravirtualized graphics devices, for example.
Signed-off-by: Avi Kivity <avi@qumranet.com>
| -rw-r--r-- | drivers/kvm/kvm_main.c | 18 | ||||
| -rw-r--r-- | 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 39cf8fd343a3..de93117f1e97 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 c93cf53953af..9151ebfa22e9 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; }; }; |