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target/riscv: Smepmp: Skip applying default rules when address matches

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When MSECCFG.MML is set, after checking the address range in PMP if the
asked permissions are not same as programmed in PMP, the default
permissions are applied. This should only be the case when there
is no matching address is found.

This patch skips applying default rules when matching address range
is found. It returns the index of the match PMP entry.

Fixes: 824cac681c (target/riscv: Fix PMP propagation for tlb)
Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230209055206.229392-1-hchauhan@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Himanshu Chauhan 2023-02-09 11:22:06 +05:30 committed by Palmer Dabbelt
parent a3ae8d46c0
commit 90b1fafce0
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 6 additions and 3 deletions
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9
target/riscv/pmp.c
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@ -441,9 +441,12 @@ int pmp_hart_has_privs(CPURISCVState *env, target_ulong addr,
}
}
if ((privs & *allowed_privs) == privs) {
ret = i;
}
/*
* If matching address range was found, the protection bits
* defined with PMP must be used. We shouldn't fallback on
* finding default privileges.
*/
ret = i;
break;
}
}