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target-ppc: Update ppc_hash64_store_hpte to support updating in-kernel htab

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This support updating htab managed by the hypervisor. Currently we don't have
any user for this feature. This actually bring the store_hpte interface
in-line with the load_hpte one. We may want to use this when we want to
emulate henter hcall in qemu for HV kvm.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[ folded fix for the "warn_unused_result" build break in
  kvmppc_hash64_write_pte(), Greg Kurz <gkurz@linux.vnet.ibm.com> ]
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aneesh Kumar K.V 2014-02-20 18:52:38 +01:00 • committed by Alexander Graf
parent 3f94170be3
commit c138593380
4 changed files with 68 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

36
target-ppc/kvm.c
View file

@ -1992,3 +1992,39 @@ void kvmppc_hash64_free_pteg(uint64_t token)
g_free(htab_buf);
return;
}
void kvmppc_hash64_write_pte(CPUPPCState *env, target_ulong pte_index,
target_ulong pte0, target_ulong pte1)
{
int htab_fd;
struct kvm_get_htab_fd ghf;
struct kvm_get_htab_buf hpte_buf;
ghf.flags = 0;
ghf.start_index = 0; /* Ignored */
htab_fd = kvm_vm_ioctl(kvm_state, KVM_PPC_GET_HTAB_FD, &ghf);
if (htab_fd < 0) {
goto error_out;
}
hpte_buf.header.n_valid = 1;
hpte_buf.header.n_invalid = 0;
hpte_buf.header.index = pte_index;
hpte_buf.hpte[0] = pte0;
hpte_buf.hpte[1] = pte1;
/*
* Write the hpte entry.
* CAUTION: write() has the warn_unused_result attribute. Hence we
* need to check the return value, even though we do nothing.
*/
if (write(htab_fd, &hpte_buf, sizeof(hpte_buf)) < 0) {
goto out_close;
}
out_close:
close(htab_fd);
return;
error_out:
return;
}