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From: Yu-Chien Peter Lin <peter.lin@sifive.com>
To: opensbi@lists.infradead.org
Cc: zong.li@sifive.com, greentime.hu@sifive.com, anup@brainfault.org,
	scott@riscstar.com, conor@kernel.org, dave.patel@riscstar.com,
	raymond.mao@riscstar.com, robin.randhawa@sifive.com,
	samuel.holland@sifive.com, pawandeep.oza@oss.qualcomm.com,
	krzk@kernel.org, Yu-Chien Peter Lin <peter.lin@sifive.com>
Subject: [PATCH v2 6/9] lib: sbi_domain_context: add slwid to per-domain S-mode context
Date: Mon, 17 Aug 2026 17:05:00 +0800	[thread overview]
Message-ID: <20260817090503.2104998-7-peter.lin@sifive.com> (raw)
In-Reply-To: <20260817090503.2104998-1-peter.lin@sifive.com>

slwid is the S-mode CSR that controls U-mode's World ID. Since
each domain may run different U-mode workloads with different
WID isolation requirements, slwid must be part of the per-domain
S-mode context.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
---
 lib/sbi/sbi_domain_context.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/lib/sbi/sbi_domain_context.c b/lib/sbi/sbi_domain_context.c
index 0861d541..0b45c0fd 100644
--- a/lib/sbi/sbi_domain_context.c
+++ b/lib/sbi/sbi_domain_context.c
@@ -50,6 +50,8 @@ struct hart_context {
 	unsigned long senvcfg;
 	/** Supervisor resource management configuration register */
 	unsigned long srmcfg;
+	/** Supervisor lower-privilege mode World ID register */
+	unsigned long slwid;
 
 	/** Float context state */
 	struct sbi_fp_context fp_ctx;
@@ -145,6 +147,17 @@ static int switch_to_next_domain_context(struct hart_context *ctx,
 		ctx->senvcfg	= csr_swap(CSR_SENVCFG, dom_ctx->senvcfg);
 	if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SSQOSID))
 		ctx->srmcfg	= csr_swap(CSR_SRMCFG, dom_ctx->srmcfg);
+	if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SSWID)) {
+		/*
+		 * Temporarily enable Sswid so slwid is accessible for
+		 * swap. The target domain's mwiddeleg is restored by
+		 * sbi_hart_protection_reconfigure() below.
+		 */
+		csr_write(CSR_MWIDDELEG, ~0UL);
+		if (csr_read(CSR_MWIDDELEG))
+			ctx->slwid = csr_swap(CSR_SLWID, dom_ctx->slwid);
+		csr_write(CSR_MWIDDELEG, 0);
+	}
 
 	/* Eager context switch for float */
 	if (sbi_hart_has_extension(scratch, SBI_HART_EXT_F) ||
-- 
2.43.7


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  parent reply	other threads:[~2026-08-17  9:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-17  9:04 [PATCH v2 0/9] Add RISC-V Worlds ISA support to OpenSBI Yu-Chien Peter Lin
2026-08-17  9:04 ` [PATCH v2 1/9] lib: sbi_hart: detect RISC-V Worlds ISA extensions Yu-Chien Peter Lin
2026-09-03 16:50   ` Pawandeep Oza
2026-08-17  9:04 ` [PATCH v2 2/9] lib: utils: fdt_helper: parse RISC-V Worlds per-hart WID properties Yu-Chien Peter Lin
2026-08-17  9:04 ` [PATCH v2 3/9] lib: fdt_domain: parse domain " Yu-Chien Peter Lin
2026-08-17  9:04 ` [PATCH v2 4/9] lib: sbi_hart: lock mwid CSR for RoT immutability Yu-Chien Peter Lin
2026-08-17  9:04 ` [PATCH v2 5/9] lib: sbi_hart: add WID protection mechanism Yu-Chien Peter Lin
2026-08-18  2:39   ` Yu-Chien Peter Lin
2026-08-17  9:05 ` Yu-Chien Peter Lin [this message]
2026-08-17  9:05 ` [PATCH v2 7/9] include: sbi_types: add PRIx64 format macro Yu-Chien Peter Lin
2026-08-17  9:05 ` [PATCH v2 8/9] lib: sbi: display World ID configuration at boot Yu-Chien Peter Lin
2026-08-17  9:05 ` [PATCH v2 9/9] docs: document WID DT properties Yu-Chien Peter Lin

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