| 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
| ||
|
Message-Id: <1343335407-5465-3-git-send-email-konrad.wilk@oracle.com> Date: Thu, 26 Jul 2012 16:43:27 -0400 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> To: linux-kernel@...r.kernel.org Cc: xen-devel@...ts.xensource.com, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Subject: [PATCH 2/2] xen/swiotlb: If user supplied e820_hole=1 in the guest config, enable SWIOTLB. We can detect that the user is using e820_hole=1 by parsing the E820. If it shows regions other than E820_RAM or E820_RESV then the user is bent on providing us with a PCI device and forgot to do 'iommu=soft'. So lets enable it for him/her. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> --- arch/x86/xen/pci-swiotlb-xen.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c index 56f373e..9b1aebb 100644 --- a/arch/x86/xen/pci-swiotlb-xen.c +++ b/arch/x86/xen/pci-swiotlb-xen.c @@ -74,6 +74,11 @@ int __init pci_xen_swiotlb_detect(void) if (xen_pv_domain()) swiotlb = 0; + /* If it hasn't been activated yet, and it has E820 that looks like + * the user supplied e820_hole=1, then turn it on. */ + if (xen_pv_domain() && !xen_initial_domain() && + !xen_swiotlb && e820_has_acpi()) + xen_swiotlb = 1; return xen_swiotlb; } -- 1.7.7.6 -- 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/
Powered by blists - more mailing lists