Subject: [PATCH v4 6/9] powerpc/platform/pseries/lpar: Fix updatepp and updateboltedpp

From: Balbir Singh <[email-masked]>
Date: Tue, 27 Jun 2017 17:49:00 +1000

PAPR has pp0 in bit 55, currently we assumed that bit
pp0 is bit 0 (all bits in IBM order). This patch fixes
the pp0 bits for both these routines that use H_PROTECT.

(e58e87a powerpc/mm: Update _PAGE_KERNEL_RO)

Signed-off-by: Balbir Singh <[email-masked]>
---
 arch/powerpc/platforms/pseries/lpar.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 6541d0b..2d36571 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -301,7 +301,7 @@ static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 				       int ssize, unsigned long inv_flags)
 {
 	unsigned long lpar_rc;
-	unsigned long flags = (newpp & 7) | H_AVPN;
+	unsigned long flags;
 	unsigned long want_v;
 
 	want_v = hpte_encode_avpn(vpn, psize, ssize);
@@ -309,6 +309,15 @@ static long pSeries_lpar_hpte_updatepp(unsigned long slot,
 	pr_devel("    update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...",
 		 want_v, slot, flags, psize);
 
+	/*
+	 * Move pp0 and set the mask, pp0 is bit 55
+	 * We ignore the keys for now.
+	 */
+	if (mmu_has_feature(MMU_FTR_KERNEL_RO))
+		flags = ((newpp & HPTE_R_PP0) >> 55) | (newpp & 7) | H_AVPN;
+	else
+		flags = (newpp & 7) | H_AVPN;
+
 	lpar_rc = plpar_pte_protect(flags, slot, want_v);
 
 	if (lpar_rc == H_NOT_FOUND) {
@@ -379,7 +388,15 @@ static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
 	slot = pSeries_lpar_hpte_find(vpn, psize, ssize);
 	BUG_ON(slot == -1);
 
-	flags = newpp & 7;
+	/*
+	 * Move pp0 and set the mask, pp0 is bit 55
+	 * We ignore the keys for now.
+	 */
+	if (mmu_has_feature(MMU_FTR_KERNEL_RO))
+		flags = ((newpp & HPTE_R_PP0) >> 55) | (newpp & 7);
+	else
+		flags = (newpp & 7);
+
 	lpar_rc = plpar_pte_protect(flags, slot, 0);
 
 	BUG_ON(lpar_rc != H_SUCCESS);
-- 
2.9.4