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target-ppc: Add helper for KVM_PPC_RTAS_DEFINE_TOKEN

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Recent PowerKVM allows the kernel to intercept some RTAS calls from the
guest directly.  This is used to implement the more efficient in-kernel
XICS for example.  qemu is still responsible for assigning the RTAS token
numbers however, and needs to tell the kernel which RTAS function name is
assigned to a given token value.  This patch adds a convenience wrapper for
the KVM_PPC_RTAS_DEFINE_TOKEN ioctl() which is used for this purpose.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
David Gibson 2013-09-26 16:18:35 +10:00 committed by Alexander Graf
parent 4fe822e075
commit feaa64c41f
2 changed files with 21 additions and 0 deletions
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14
target-ppc/kvm.c
View file

@ -1789,6 +1789,20 @@ static int kvm_ppc_register_host_cpu_type(void)
return 0;
}
int kvmppc_define_rtas_kernel_token(uint32_t token, const char *function)
{
struct kvm_rtas_token_args args = {
.token = token,
};
if (!kvm_check_extension(kvm_state, KVM_CAP_PPC_RTAS)) {
return -ENOENT;
}
strncpy(args.name, function, sizeof(args.name));
return kvm_vm_ioctl(kvm_state, KVM_PPC_RTAS_DEFINE_TOKEN, &args);
}
int kvmppc_get_htab_fd(bool write)
{

7
target-ppc/kvm_ppc.h
View file

@ -38,6 +38,7 @@ uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift);
#endif /* !CONFIG_USER_ONLY */
int kvmppc_fixup_cpu(PowerPCCPU *cpu);
bool kvmppc_has_cap_epr(void);
int kvmppc_define_rtas_kernel_token(uint32_t token, const char *function);
int kvmppc_get_htab_fd(bool write);
int kvmppc_save_htab(QEMUFile *f, int fd, size_t bufsize, int64_t max_ns);
int kvmppc_load_htab_chunk(QEMUFile *f, int fd, uint32_t index,
@ -164,6 +165,12 @@ static inline bool kvmppc_has_cap_epr(void)
return false;
}
static inline int kvmppc_define_rtas_kernel_token(uint32_t token,
const char *function)
{
return -1;
}
static inline int kvmppc_get_htab_fd(bool write)
{
return -1;