From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sipsolutions.net header.i=@sipsolutions.net header.b="fQjRHmY5" Received: from sipsolutions.net (s3.sipsolutions.net [IPv6:2a01:4f8:242:246e::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38076F2 for ; Fri, 1 Dec 2023 12:04:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=MIME-Version:Content-Transfer-Encoding: Content-Type:References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To: Resent-Cc:Resent-Message-ID; bh=dxveFagBNj5/ty55lDPJPyZWurWMS/8ve7eeXES38tY=; t=1701461074; x=1702670674; b=fQjRHmY55FQ0y5++oc7gX3SbqbIeYIr57eRzHqXWxx/Auj8 CU2GP2cC87NUSO75aZBESr8Xpz0aW2SMxtOL1peqOcNwVC0lYW8LVhqTT4oFj9CCg+VSCFs9y4tVn 3UT9C53TnTGvAAADzjAgD2unG82TlgnxqwdPxRxUw24SWxuEbl7WEVKF11nBcAfGNn67fcm4aD+gN uVxK9NasihFAMs7XIXO+vzUpg3x2O6YCcxYyK9lP+s+ngXOPygy5IeVMH9WaUhliDyk5mDCH3844X nTi0olAcwH93E7rLJ6sYubX4hiO86Q9PXvyqUa/tp/Ra5fxmPFCytd1dLehsZYyA==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.97) (envelope-from ) id 1r99kV-0000000BRhY-1WHh; Fri, 01 Dec 2023 21:04:31 +0100 Message-ID: <640c12810b336aa99584697e21215f3cacb13c79.camel@sipsolutions.net> Subject: Re: jitterentropy vs. simulation From: Johannes Berg To: Simo Sorce , Anton Ivanov , linux-um@lists.infradead.org Cc: linux-crypto@vger.kernel.org, Stephan =?ISO-8859-1?Q?M=FCller?= Date: Fri, 01 Dec 2023 21:04:30 +0100 In-Reply-To: References: <7db861e3-60e4-0ed4-9b28-25a89069a9db@kot-begemot.co.uk> <8ddb48606cebe4e404d17a627138aa5c5af6dccd.camel@sipsolutions.net> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.48.4 (3.48.4-1.fc38) Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-malware-bazaar: not-scanned On Fri, 2023-12-01 at 14:25 -0500, Simo Sorce wrote: >=20 > Doesn't this imply the simulation is not complete Kind of? > and you need to add > clock jitter for the simulation to be more useful? >=20 No, it's more _intentionally_ incomplete. This works fine in normal ARCH=3Dum, but with time-travel variants we have more of a discrete event- based simulation, to integrates well with other things (e.g. SystemC or similar based device simulations). So this is quite intentional, and yes, it breaks in a few spots such as this one. johannes