From: Yu-Chien Peter Lin <peter.lin@sifive.com>
To: opensbi@lists.infradead.org
Cc: zong.li@sifive.com, greentime.hu@sifive.com,
alvinga@andestech.com, Yu-Chien Peter Lin <peter.lin@sifive.com>
Subject: [PATCH 5/8] lib: sbi_domain_context: skip the reserved entry during domain context switch
Date: Thu, 14 Aug 2025 19:05:19 +0800 [thread overview]
Message-ID: <20250814110522.18809-6-peter.lin@sifive.com> (raw)
In-Reply-To: <20250814110522.18809-1-peter.lin@sifive.com>
The reserved entry is activated to create shared region between M-mode
and S-mode, it should remain unchanged during domain context switch.
Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
---
lib/sbi/sbi_domain_context.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/lib/sbi/sbi_domain_context.c b/lib/sbi/sbi_domain_context.c
index fb04d81d..1812c7c9 100644
--- a/lib/sbi/sbi_domain_context.c
+++ b/lib/sbi/sbi_domain_context.c
@@ -116,6 +116,11 @@ static void switch_to_next_domain_context(struct hart_context *ctx,
/* Reconfigure PMP settings for the new domain */
for (int i = 0; i < pmp_count; i++) {
+ /* Skip the reserved entry when SmePMP is enabled */
+ if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SMEPMP) &&
+ (i == SBI_SMEPMP_RESV_ENTRY)) {
+ continue;
+ }
sbi_platform_pmp_disable(sbi_platform_thishart_ptr(), i);
pmp_disable(i);
}
--
2.39.3
--
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next prev parent reply other threads:[~2025-08-14 15:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-14 11:05 [PATCH 0/8] SmePMP bugfixes and improvement Yu-Chien Peter Lin
2025-08-14 11:05 ` [PATCH 1/8] lib: sbi_hart: move sbi_hart_get_smepmp_flags() to sbi_domain Yu-Chien Peter Lin
2025-08-14 11:05 ` [PATCH 2/8] lib: sbi_domain: allow specifying inaccessible region Yu-Chien Peter Lin
2025-08-14 11:05 ` [PATCH 3/8] lib: sbi_domain: print unsupported SmePMP permissions Yu-Chien Peter Lin
2025-08-14 11:05 ` [PATCH 4/8] lib: sbi_hart: add error message for insufficient PMP entries Yu-Chien Peter Lin
2025-08-14 11:05 ` Yu-Chien Peter Lin [this message]
2025-08-15 5:54 ` [PATCH 5/8] lib: sbi_domain_context: skip the reserved entry during domain context switch Alvin Che-Chia Chang(張哲嘉)
2025-08-14 11:05 ` [PATCH 6/8] lib: sbi_domain: add SBI_DOMAIN_MEMREGION_FW memregion flag Yu-Chien Peter Lin
2025-08-14 15:39 ` Alvin Che-Chia Chang(張哲嘉)
2025-08-21 8:32 ` Xiang W
2025-08-14 11:05 ` [PATCH 7/8] lib: sbi_domain: ensure consistent firmware PMP entries Yu-Chien Peter Lin
2025-08-14 11:05 ` [PATCH 8/8] lib: sbi_domain_context: preserve firmware PMP entries during domain context switch Yu-Chien Peter Lin
2025-10-06 5:21 ` [PATCH 0/8] SmePMP bugfixes and improvement Anup Patel
2025-10-08 1:30 ` Peter Lin
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