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: <1444249310-23433-2-git-send-email-konrad.wilk@oracle.com> Date: Wed, 7 Oct 2015 16:21:49 -0400 From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> To: boris.ostrovsky@...cle.com, joao.m.martins@...cle.com, david.vrabel@...rix.com, jgross@...e.com, dario.faggioli@...rix.com, xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> Subject: [RFC PATCH v1 1/2] xen/apic: Use vAPIC for IPI if the hardware supports it. Instead of using the event channels. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> --- arch/x86/xen/smp.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c index 3f4ebf0..d4f4560 100644 --- a/arch/x86/xen/smp.c +++ b/arch/x86/xen/smp.c @@ -793,15 +793,33 @@ static int xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle) return rc; } +static bool __init xen_use_vapic(void) +{ + uint32_t eax = cpuid_eax(xen_cpuid_base() + 4); + + if (((eax & XEN_HVM_CPUID_X2APIC_VIRT) && x2apic_mode) || + ((eax & XEN_HVM_CPUID_APIC_ACCESS_VIRT) && cpu_has_apic)) + return true; + + return false; +} void __init xen_hvm_smp_init(void) { + bool vapic; + if (!xen_have_vector_callback) return; + + vapic = xen_use_vapic(); smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus; - smp_ops.smp_send_reschedule = xen_smp_send_reschedule; smp_ops.cpu_up = xen_hvm_cpu_up; smp_ops.cpu_die = xen_cpu_die; + smp_ops.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu; + + printk("Using %s IPI mode\n", vapic ? "vAPIC" : "event channel"); + if (vapic) + return; + smp_ops.smp_send_reschedule = xen_smp_send_reschedule; smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi; smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi; - smp_ops.smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu; } -- 2.4.3 -- 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