lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date: Fri, 16 Feb 2024 06:10:03 -0800
From: Saurabh Sengar <ssengar@...ux.microsoft.com>
To: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: ssengar@...rosoft.com
Subject: [PATCH] Drivers: hv: Kconfig: select CPUMASK_OFFSTACK for Hyper-V

CPUMASK_OFFSTACK must be set to have NR_CPUS_RANGE_END value greater than
512, which eventually allows NR_CPUS > 512.

CPUMASK_OFFSTACK can also be enabled by setting MAXSMP=y, but that will
set NR_CPUS=8192. This is not accurate for Hyper-V, because maximum number
of vCPU supported by Hyper-V today is 2048. Thus, enabling MAXSMP increase
the vmlinux size unnecessary.

This option allows NR_CPUS=2048 which saves around 1MB of vmlinux size for
Hyper-V.

Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
---
 drivers/hv/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 0024210..bc3f496 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -9,6 +9,7 @@ config HYPERV
 	select PARAVIRT
 	select X86_HV_CALLBACK_VECTOR if X86
 	select OF_EARLY_FLATTREE if OF
+	select CPUMASK_OFFSTACK
 	help
 	  Select this option to run Linux as a Hyper-V client operating
 	  system.
-- 
1.8.3.1


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ