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KVM: PPC: Book3S HV: Use IDA allocator for LPID allocator

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This removes the fixed-size lpid_inuse array.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220123120043.3586018-4-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2022-01-23 22:00:40 +10:00 committed by Michael Ellerman
parent 5d506f159b
commit 6ba2a2924d
1 changed files with 13 additions and 12 deletions
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25
arch/powerpc/kvm/powerpc.c
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@ -2496,20 +2496,22 @@ out:
return r;
}
static unsigned long lpid_inuse[BITS_TO_LONGS(KVMPPC_NR_LPIDS)];
static DEFINE_IDA(lpid_inuse);
static unsigned long nr_lpids;
long kvmppc_alloc_lpid(void)
{
long lpid;
int lpid;
do {
lpid = find_first_zero_bit(lpid_inuse, KVMPPC_NR_LPIDS);
if (lpid >= nr_lpids) {
/* The host LPID must always be 0 (allocation starts at 1) */
lpid = ida_alloc_range(&lpid_inuse, 1, nr_lpids - 1, GFP_KERNEL);
if (lpid < 0) {
if (lpid == -ENOMEM)
pr_err("%s: Out of memory\n", __func__);
else
pr_err("%s: No LPIDs free\n", __func__);
return -ENOMEM;
}
} while (test_and_set_bit(lpid, lpid_inuse));
return -ENOMEM;
}
return lpid;
}
@ -2517,15 +2519,14 @@ EXPORT_SYMBOL_GPL(kvmppc_alloc_lpid);
void kvmppc_free_lpid(long lpid)
{
clear_bit(lpid, lpid_inuse);
ida_free(&lpid_inuse, lpid);
}
EXPORT_SYMBOL_GPL(kvmppc_free_lpid);
/* nr_lpids_param includes the host LPID */
void kvmppc_init_lpid(unsigned long nr_lpids_param)
{
nr_lpids = min_t(unsigned long, KVMPPC_NR_LPIDS, nr_lpids_param);
memset(lpid_inuse, 0, sizeof(lpid_inuse));
set_bit(0, lpid_inuse); /* The host LPID must always be 0 */
nr_lpids = nr_lpids_param;
}
EXPORT_SYMBOL_GPL(kvmppc_init_lpid);