linux-kernel - [PATCH] Fixes for more than 32 VCPUs migration for HVM guests (v1).

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:	Tue,  8 Apr 2014 13:25:48 -0400
From:	konrad@...nel.org
To:	xen-devel@...ts.xenproject.org, david.vrabel@...rix.com,
	boris.ostrovsky@...cle.com, linux-kernel@...r.kernel.org,
	keir@....org, jbeulich@...e.com
Subject: [PATCH] Fixes for more than 32 VCPUs migration for HVM guests (v1).

These two patches (one for Linux, one for Xen) allow PVHVM guests to use
the per-cpu VCPU mechanism after migration. Currently when an PVHVM guest
migrates all the per-cpu information is lost and we fallback on the
shared_info structure. This is regardless if the HVM guest has 2 or 128 CPUs.
Since the structure has an array for only 32 CPUs that means if we are
to migrate a PVHVM guest - we can only do it up to 32 CPUs.

These patches fix it and allow more than 32 VCPUs to be migrated with
PVHVM Linux guests.

The Linux diff is:

 arch/x86/xen/enlighten.c |   21 ++++++++++++++++-----
 arch/x86/xen/suspend.c   |    6 +-----
 arch/x86/xen/time.c      |    3 +++
 3 files changed, 20 insertions(+), 10 deletions(-)

while the Xen one is:

 xen/arch/x86/hvm/hvm.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/