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[GIT,PULL,05/11] s390/uv: Always export uv_info

Message ID 20230621153227.57250-6-frankja@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series [GIT,PULL,01/11] KVM: s390: fix KVM_S390_GET_CMMA_BITS for GFNs in memslot holes | expand

Commit Message

Janosch Frank June 21, 2023, 3:29 p.m. UTC 
From: Steffen Eiden <seiden@linux.ibm.com>

KVM needs the struct's values to be able to provide PV support.

The uvdevice is currently guest only and will need the struct's values
for call support checking and potential future expansions.

As uv.c is only compiled with CONFIG_PGSTE or
CONFIG_PROTECTED_VIRTUALIZATION_GUEST we don't need a second check in
the code. Users of uv_info will need to fence for these two config
options for the time being.

Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20230615100533.3996107-2-seiden@linux.ibm.com
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20230615100533.3996107-2-seiden@linux.ibm.com>
---
 arch/s390/kernel/uv.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
index cb2ee06df286..e320a382fa85 100644
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -23,12 +23,20 @@ 
 int __bootdata_preserved(prot_virt_guest);
 #endif
 
+/*
+ * uv_info contains both host and guest information but it's currently only
+ * expected to be used within modules if it's the KVM module or for
+ * any PV guest module.
+ *
+ * The kernel itself will write these values once in uv_query_info()
+ * and then make some of them readable via a sysfs interface.
+ */
 struct uv_info __bootdata_preserved(uv_info);
+EXPORT_SYMBOL(uv_info);
 
 #if IS_ENABLED(CONFIG_KVM)
 int __bootdata_preserved(prot_virt_host);
 EXPORT_SYMBOL(prot_virt_host);
-EXPORT_SYMBOL(uv_info);
 
 static int __init uv_init(phys_addr_t stor_base, unsigned long stor_len)
 {