From: "Radim Krčmář" <rkrcmar@ventanamicro.com>
To: "Anup Patel" <anup@brainfault.org>
Cc: <opensbi@lists.infradead.org>
Subject: Re: [PATCH 8/8] lib: sbi_hart: properly reset Ssstateen
Date: Mon, 28 Apr 2025 15:44:53 +0200 [thread overview]
Message-ID: <D9IBFEASD5JP.1ISQR5MP8X452@ventanamicro.com> (raw)
In-Reply-To: <CAAhSdy1P3apLpKOzW4YSpHGN-PQGokaCMsotOb6LubZoavExNg@mail.gmail.com>
2025-04-28T18:09:47+05:30, Anup Patel <anup@brainfault.org>:
> On Tue, Apr 15, 2025 at 8:13 PM Radim Krčmář <rkrcmar@ventanamicro.com> wrote:
>>
>> sstateen* and hstateen* CSRs must be zeroed by M-mode if the mstateen*
>> registers are missing, to avoid security issues.
>>
>> Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
>> ---
>> diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
>> @@ -114,12 +114,22 @@ static void mstatus_init(struct sbi_scratch *scratch)
>> csr_write64(CSR_MSTATEEN1, SMSTATEEN_STATEN);
>> csr_write64(CSR_MSTATEEN2, SMSTATEEN_STATEN);
>> csr_write64(CSR_MSTATEEN3, SMSTATEEN_STATEN);
>> + }
>>
>> - if (misa_extension('S'))
>> + if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SMSTATEEN) ||
>> + sbi_hart_has_extension(scratch, SBI_HART_EXT_SSSTATEEN)) {
>
> This should only check SSSTATEEEN.
Right, Smstateen implies Ssstateen, thanks.
--
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next prev parent reply other threads:[~2025-04-28 13:55 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-15 13:19 [PATCH 0/8] Reset more security-related CSRs Radim Krčmář
2025-04-15 13:19 ` [PATCH 1/8] lib: sbi: add 64 bit csr macros Radim Krčmář
2025-04-28 12:28 ` Anup Patel
2025-04-28 13:48 ` Radim Krčmář
2025-04-15 13:19 ` [PATCH 2/8] lib: sbi: use " Radim Krčmář
2025-04-28 12:29 ` Anup Patel
2025-04-15 13:19 ` [PATCH 3/8] lib: sbi_hart: reset hstatus Radim Krčmář
2025-04-28 12:27 ` Anup Patel
2025-04-15 13:19 ` [PATCH 4/8] lib: sbi_hart: reset sstateen and hstateen Radim Krčmář
2025-04-28 12:29 ` Anup Patel
2025-04-15 13:19 ` [PATCH 5/8] lib: sbi_hart: fix sstateen emulation Radim Krčmář
2025-04-28 12:34 ` Anup Patel
2025-04-15 13:19 ` [PATCH 6/8] lib: sbi_hart: reset mstateen0 Radim Krčmář
2025-04-28 12:35 ` Anup Patel
2025-04-15 13:19 ` [PATCH 7/8] lib: sbi_hart: add Ssstateen extension Radim Krčmář
2025-04-28 12:38 ` Anup Patel
2025-04-28 13:47 ` Radim Krčmář
2025-04-29 5:30 ` Anup Patel
2025-04-15 13:19 ` [PATCH 8/8] lib: sbi_hart: properly reset Ssstateen Radim Krčmář
2025-04-28 12:39 ` Anup Patel
2025-04-28 13:44 ` Radim Krčmář [this message]
2025-04-28 12:41 ` [PATCH 0/8] Reset more security-related CSRs Anup Patel
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