[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PATCH] cmdline: document "extra_guest_irqs" upper bound
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 4 Apr 2023 08:46:42 +0200
- Arc-authentication-results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=suse.com; dmarc=pass action=none header.from=suse.com; dkim=pass header.d=suse.com; arc=none
- Arc-message-signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=TawaQTZiKD5mX4SgPj1LVmMbrtcalac5mcR+lI2S6YE=; b=PbEgIQUgk7uMQwu6SJnS7QJWhWBXXZg/9q6LbHU4XaMu+xWrWrbIkKxSMcwVtnOCwFZA+WpSJbXv2pF/NVi2ct4xIJYnMh/tp3FU+CtA7Iid7wjQKbqSKjuBIIF4qBIvv/DoLSRXo2Os6ZZ61K94OSnbm4iQwP1lc2hSrczyiGkjnNY+XVOhQwWuh/cm86zB0YEBeEgOkPmSutBgmTR9oarxLwpwzICKTaqPWgPayIoq9sJKmFswaQapdpIhxL3vuk9eO/ObB0TUNWW8DeZpFKnutejcnE5KeIi1hFaogc+F9QdVQg9d9tTvTdY3mngg7UH5bmc5tMN1bPed96BCBw==
- Arc-seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=TD9pz/84qduABV1TQTEYHXOTnwmLiWEAMoA+2g9ssPxxgi6MeQd+6+5daIlhUApcY6yR/u4PRqCTC9BKfixH/i/5f+JvQv2ewH2hj6PAyk+7ZQ68kRslOt9aTosFnz9e/sJyC0z1pBMnlfAor/1DTbKvfYLs44JfTC8OWUSNPQr2w/xpWRW/lTG+SXLLCu4kZx+T2tlrT2ziDufPLAUxooaIOrwKoODhbkFQqcgUjoU+8H/vphqLKtlJqvx8O2+vomcx6T3uk3qaKg6L+g49+CoL2JcXuYAdr1L8Da0GBiNynGODo1AwcLnFxYuypGQJV/k+pSCK4Ykd2lH9O8uFSA==
- Authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=suse.com;
- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 04 Apr 2023 06:47:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
PHYSDEVOP_pirq_eoi_gmfn_v<N> accepting just a single GFN implies that no
more than 32k pIRQ-s can be used by a domain. Document this upper bound.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
I was uncertain about also introducing a bounds check in code: We don't
check for bogus / abusive values elsewhere either.
--- a/docs/misc/xen-command-line.pandoc
+++ b/docs/misc/xen-command-line.pandoc
@@ -1130,7 +1130,8 @@ common for all domUs, while the optional
is for dom0. Changing the setting for domU has no impact on dom0 and vice
versa. For example to change dom0 without changing domU, use
`extra_guest_irqs=,512`. The default value for Dom0 and an eventual separate
-hardware domain is architecture dependent.
+hardware domain is architecture dependent. The upper limit for both values is
+32768.
Note that specifying zero as domU value means zero, while for dom0 it means
to use the default.
|
