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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 635/779] powerpc/32: Call mmu_mark_initmem_nx() regardless of data block mapping.
Date:   Mon, 15 Aug 2022 20:04:39 +0200
Message-Id: <20220815180404.482517916@linuxfoundation.org>
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From: Christophe Leroy <christophe.leroy@csgroup.eu>

[ Upstream commit 980bbf7ca72012d317617fcdbfabe8708e4cef29 ]

mark_initmem_nx() calls either mmu_mark_initmem_nx() or
set_memory_attr() based on return from v_block_mapped()
of _sinittext.

But we can now handle text and data independently, so that
text may be mapped by block even when data is mapped by pages.

On the 8xx for instance, at startup 32Mbytes of memory are
pinned in TLB. So the pinned entries need to go away for sinittext.

In next patch a BAT will be set to also covers sinittext on book3s/32.
So it will also be needed to call mmu_mark_initmem_nx() even when
data above sinittext is not mapped with BATs.

As this is highly dependent on the platform, call mmu_mark_initmem_nx()
regardless of data block mapping. Then the platform will know what to
do.

Modify 8xx mmu_mark_initmem_nx() so that inittext mapping is modified
only when pagealloc debug and kfence are not active, otherwise inittext
is mapped with standard pages. And don't do anything on kernel text
which is already mapped with PAGE_KERNEL_TEXT.

Fixes: da1adea07576 ("powerpc/8xx: Allow STRICT_KERNEL_RwX with pinned TLB")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/db3fc14f3bfa6215b0786ef58a6e2bc1e1f964d7.1655202804.git.christophe.leroy@csgroup.eu
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/powerpc/mm/nohash/8xx.c | 4 ++--
 arch/powerpc/mm/pgtable_32.c | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c
index 0df9fe29dd56..5348e1f9eb94 100644
--- a/arch/powerpc/mm/nohash/8xx.c
+++ b/arch/powerpc/mm/nohash/8xx.c
@@ -183,8 +183,8 @@ void mmu_mark_initmem_nx(void)
 	unsigned long boundary = strict_kernel_rwx_enabled() ? sinittext : etext8;
 	unsigned long einittext8 = ALIGN(__pa(_einittext), SZ_8M);
 
-	mmu_mapin_ram_chunk(0, boundary, PAGE_KERNEL_TEXT, false);
-	mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL, false);
+	if (!debug_pagealloc_enabled_or_kfence())
+		mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL, false);
 
 	mmu_pin_tlb(block_mapped_ram, false);
 }
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index f28859771440..502e3d3d1dbf 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -138,9 +138,9 @@ void mark_initmem_nx(void)
 	unsigned long numpages = PFN_UP((unsigned long)_einittext) -
 				 PFN_DOWN((unsigned long)_sinittext);
 
-	if (v_block_mapped((unsigned long)_sinittext)) {
-		mmu_mark_initmem_nx();
-	} else {
+	mmu_mark_initmem_nx();
+
+	if (!v_block_mapped((unsigned long)_sinittext)) {
 		set_memory_nx((unsigned long)_sinittext, numpages);
 		set_memory_rw((unsigned long)_sinittext, numpages);
 	}
-- 
2.35.1