linux-kernel - [PATCH v3 02/23] KVM: s390: add P bit in table entry bitfields, move union vaddress

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251106161117.350395-3-imbrenda@linux.ibm.com>
Date: Thu,  6 Nov 2025 17:10:56 +0100
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        borntraeger@...ibm.com, frankja@...ux.ibm.com, nsg@...ux.ibm.com,
        nrb@...ux.ibm.com, seiden@...ux.ibm.com, schlameuss@...ux.ibm.com,
        hca@...ux.ibm.com, svens@...ux.ibm.com, agordeev@...ux.ibm.com,
        gor@...ux.ibm.com, david@...hat.com, gerald.schaefer@...ux.ibm.com
Subject: [PATCH v3 02/23] KVM: s390: add P bit in table entry bitfields, move union vaddress

Add P bit in hardware definition of region 3 and segment table entries.

Move union vaddress from kvm/gaccess.c to asm/dat_bits.h

Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@...ux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@...ux.ibm.com>
Reviewed-by: Christoph Schlameuss <schlameuss@...ux.ibm.com>
---
 arch/s390/include/asm/dat-bits.h | 32 ++++++++++++++++++++++++++++++--
 arch/s390/kvm/gaccess.c          | 26 --------------------------
 2 files changed, 30 insertions(+), 28 deletions(-)

diff --git a/arch/s390/include/asm/dat-bits.h b/arch/s390/include/asm/dat-bits.h
index 8d65eec2f124..c40874e0e426 100644
--- a/arch/s390/include/asm/dat-bits.h
+++ b/arch/s390/include/asm/dat-bits.h
@@ -9,6 +9,32 @@
 #ifndef _S390_DAT_BITS_H
 #define _S390_DAT_BITS_H
 
+/*
+ * vaddress union in order to easily decode a virtual address into its
+ * region first index, region second index etc. parts.
+ */
+union vaddress {
+	unsigned long addr;
+	struct {
+		unsigned long rfx : 11;
+		unsigned long rsx : 11;
+		unsigned long rtx : 11;
+		unsigned long sx  : 11;
+		unsigned long px  : 8;
+		unsigned long bx  : 12;
+	};
+	struct {
+		unsigned long rfx01 : 2;
+		unsigned long	    : 9;
+		unsigned long rsx01 : 2;
+		unsigned long	    : 9;
+		unsigned long rtx01 : 2;
+		unsigned long	    : 9;
+		unsigned long sx01  : 2;
+		unsigned long	    : 29;
+	};
+};
+
 union asce {
 	unsigned long val;
 	struct {
@@ -98,7 +124,8 @@ union region3_table_entry {
 	struct {
 		unsigned long	: 53;
 		unsigned long fc: 1; /* Format-Control */
-		unsigned long	: 4;
+		unsigned long p : 1; /* DAT-Protection Bit */
+		unsigned long	: 3;
 		unsigned long i : 1; /* Region-Invalid Bit */
 		unsigned long cr: 1; /* Common-Region Bit */
 		unsigned long tt: 2; /* Table-Type Bits */
@@ -140,7 +167,8 @@ union segment_table_entry {
 	struct {
 		unsigned long	: 53;
 		unsigned long fc: 1; /* Format-Control */
-		unsigned long	: 4;
+		unsigned long p : 1; /* DAT-Protection Bit */
+		unsigned long	: 3;
 		unsigned long i : 1; /* Segment-Invalid Bit */
 		unsigned long cs: 1; /* Common-Segment Bit */
 		unsigned long tt: 2; /* Table-Type Bits */
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index 21c2e61fece4..d691fac1cc12 100644
--- a/arch/s390/kvm/gaccess.c
+++ b/arch/s390/kvm/gaccess.c
@@ -20,32 +20,6 @@
 
 #define GMAP_SHADOW_FAKE_TABLE 1ULL
 
-/*
- * vaddress union in order to easily decode a virtual address into its
- * region first index, region second index etc. parts.
- */
-union vaddress {
-	unsigned long addr;
-	struct {
-		unsigned long rfx : 11;
-		unsigned long rsx : 11;
-		unsigned long rtx : 11;
-		unsigned long sx  : 11;
-		unsigned long px  : 8;
-		unsigned long bx  : 12;
-	};
-	struct {
-		unsigned long rfx01 : 2;
-		unsigned long	    : 9;
-		unsigned long rsx01 : 2;
-		unsigned long	    : 9;
-		unsigned long rtx01 : 2;
-		unsigned long	    : 9;
-		unsigned long sx01  : 2;
-		unsigned long	    : 29;
-	};
-};
-
 /*
  * raddress union which will contain the result (real or absolute address)
  * after a page table walk. The rfaa, sfaa and pfra members are used to
-- 
2.51.1