This is a note to let you know that I've just added the patch titled
powerpc/pseries/vas: Ignore VAS update for DLPAR if copy/paste is not enabled
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-pseries-vas-ignore-vas-update-for-dlpar-if-copy-paste-is-not-enabled.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From eca9f6e6f83b6725b84e1c76fdde19b003cff0eb Mon Sep 17 00:00:00 2001
From: Haren Myneni <haren@xxxxxxxxxxxxx>
Date: Mon, 20 Mar 2023 19:50:08 -0700
Subject: powerpc/pseries/vas: Ignore VAS update for DLPAR if copy/paste is not enabled
From: Haren Myneni <haren@xxxxxxxxxxxxx>
commit eca9f6e6f83b6725b84e1c76fdde19b003cff0eb upstream.
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@xxxxxxxxxxxxxxx # v6.1+
Signed-off-by: Haren Myneni <haren@xxxxxxxxxxxxx>
Reviewed-by: Nathan Lynch <nathanl@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/1d0e727e7dbd9a28627ef08ca9df9c86a50175e2.camel@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/platforms/pseries/vas.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/arch/powerpc/platforms/pseries/vas.c
+++ b/arch/powerpc/platforms/pseries/vas.c
@@ -857,6 +857,13 @@ 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));
@@ -1013,6 +1020,7 @@ 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;
}
Patches currently in stable-queue which might be from haren@xxxxxxxxxxxxx are
queue-6.2/powerpc-pseries-vas-ignore-vas-update-for-dlpar-if-copy-paste-is-not-enabled.patch
