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[46.204.108.203]) by smtp.gmail.com with ESMTPSA id j22-20020a2e3c16000000b00295a36fedadsm239600lja.26.2023.03.03.02.24.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Mar 2023 02:24:29 -0800 (PST) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 956307ef-b9ad-11ed-96af-2f268f93b82a DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1677839070; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=8hWSEJWaX2x45VFZiclMK6V02iZ6pYreDLKtpiIaFEE=; b=DJtBoNyFaPY6Y8DyhtlVv5Wexjw/KD5WP54xvy0rew+0Oxi6sVywT5imDVMCpnloRX zoowAylmc66Gb98GPvMCD6Z2Qxe/8XHxjg0EPWm018AEAZUiTlWyZ1eM3yA7f4TFearY NN+xDvuwLp4wZ16va9WQL8US2kURVt0Ma+k0ngP/GhnXJB4Ic9n6yQGX15+VtpDgWahP IU9sR3X0UdWLPGvmnW4aHao3jZuMgZL8j6MrBwiRv6rE92Bq5/kqb0mgXj/Cui6UGXV5 Alunl4NBfJoKypEcR/iTmBWutJgveWV7Lzq9Lfhr+lcgzUSGPKClscrLkx8tIRR5GAqD /aGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1677839070; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=8hWSEJWaX2x45VFZiclMK6V02iZ6pYreDLKtpiIaFEE=; b=XWHcNWxVth0sigScG0SbyiyVWfzkbanD1jDDwnyCKRgrUQmElUm0iCnRzYYuQvNUGH oCTD4PKGwXd0wO5tO07FQS01FVLiVbiwX80UufwrpaA2xa9P1cxsbp2CeKQnBDXm9yR2 ofalv+nhvSvEXkjXtbGs5zo0btYnBrAzCzEeUOz/j/U6YLkF5wV8ciqBLU6dTv+Bszij 2M37qBvo2vrde+HnTGRpWya6eEpJ6QmG6w0iS7aW5nnYIeYZT8Hgbx4XPQLquOTC24I/ 6vEBhEAVGrgQJy1QoJ0NUkIjYB6AJzA6a5KAyJffmGc4d0eSb1hkBNOaN3z8wC39QxWY dnsw== X-Gm-Message-State: AO0yUKX198+ku05Fz79FxfvsY+SWVlNUGMtvObWBnmmQ2+/tqQYeY4z6 KdN4ovqWMIcNoiSStWgan/Nl6IXecXM= X-Google-Smtp-Source: AK7set+fSh/GHl42poB+55Nk4PbUJa0DzugZ3Cmcz6LJpvrxYddqCr8zJzQZJ8SFWUCOW9Qp+TgwCw== X-Received: by 2002:a05:651c:2110:b0:293:38e0:cac8 with SMTP id a16-20020a05651c211000b0029338e0cac8mr588442ljq.16.1677839069820; Fri, 03 Mar 2023 02:24:29 -0800 (PST) From: Oleksii Kurochko To: xen-devel@lists.xenproject.org Cc: Jan Beulich , Andrew Cooper , Stefano Stabellini , Gianluca Guida , Oleksii Kurochko , Bob Eshleman , Alistair Francis , Connor Davis Subject: [PATCH v3 1/3] xen/riscv: disable fpu Date: Fri, 3 Mar 2023 12:24:22 +0200 Message-Id: <1fe0c827b9e5c2fef569e25ad7ca377111228d29.1677838213.git.oleksii.kurochko@gmail.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Disable FPU to detect illegal usage of floating point in kernel space. Signed-off-by: Oleksii Kurochko --- xen/arch/riscv/riscv64/head.S | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/xen/arch/riscv/riscv64/head.S b/xen/arch/riscv/riscv64/head.S index ffd95f9f89..52fa41c778 100644 --- a/xen/arch/riscv/riscv64/head.S +++ b/xen/arch/riscv/riscv64/head.S @@ -6,6 +6,13 @@ ENTRY(start) /* Mask all interrupts */ csrw CSR_SIE, zero + /* + * Disable FPU to detect illegal usage of + * floating point in kernel space + */ + li t0, SSTATUS_FS + csrc CSR_SSTATUS, t0 + la sp, cpu0_boot_stack li t0, STACK_SIZE add sp, sp, t0 -- 2.39.0