diff options
| author | Haren Myneni <haren@linux.ibm.com> | 2023-03-20 19:50:08 -0700 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-03-29 23:01:35 +1100 |
| commit | eca9f6e6f83b6725b84e1c76fdde19b003cff0eb (patch) | |
| tree | a85160d03f47c760409191eca37497eec84b5af6 /arch | |
| parent | fd7276189450110ed835eb0a334e62d2f1c4e3be (diff) | |
powerpc/pseries/vas: Ignore VAS update for DLPAR if copy/paste is not enabled
The hypervisor supports user-mode NX from Power10.
pseries_vas_dlpar_cpu() is called from lparcfg_write() to update VAS
windows for DLPAR event in shared processor mode and the kernel gets
-ENOTSUPP for HCALLs if the user-mode NX is not supported. The current
VAS implementation also supports only with Radix page tables. Whereas in
dedicated processor mode, pseries_vas_notifier() is registered only if
the copy/paste feature is enabled. So instead of displaying HCALL error
messages, update VAS capabilities if the copy/paste feature is
available.
This patch ignores updating VAS capabilities in pseries_vas_dlpar_cpu()
and returns success if the copy/paste feature is not enabled. Then
lparcfg_write() completes the processor DLPAR operations without any
failures.
Fixes: 2147783d6bf0 ("powerpc/pseries: Use lparcfg to reconfig VAS windows for DLPAR CPU")
Cc: stable@vger.kernel.org # v6.1+
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Reviewed-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/1d0e727e7dbd9a28627ef08ca9df9c86a50175e2.camel@linux.ibm.com
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/pseries/vas.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/vas.c b/arch/powerpc/platforms/pseries/vas.c index 559112312810..513180467562 100644 --- a/arch/powerpc/platforms/pseries/vas.c +++ b/arch/powerpc/platforms/pseries/vas.c @@ -856,6 +856,13 @@ int pseries_vas_dlpar_cpu(void) { int new_nr_creds, rc; + /* + * NX-GZIP is not enabled. Nothing to do for DLPAR event + */ + if (!copypaste_feat) + return 0; + + rc = h_query_vas_capabilities(H_QUERY_VAS_CAPABILITIES, vascaps[VAS_GZIP_DEF_FEAT_TYPE].feat, (u64)virt_to_phys(&hv_cop_caps)); @@ -1012,6 +1019,7 @@ static int __init pseries_vas_init(void) * Linux supports user space COPY/PASTE only with Radix */ if (!radix_enabled()) { + copypaste_feat = false; pr_err("API is supported only with radix page tables\n"); return -ENOTSUPP; } |