| 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: <20170413101116.723-9-jgross@suse.com> Date: Thu, 13 Apr 2017 12:11:13 +0200 From: Juergen Gross <jgross@...e.com> To: linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org Cc: boris.ostrovsky@...cle.com, Juergen Gross <jgross@...e.com> Subject: [PATCH v2 08/11] x86/xen: use capabilities instead of fake cpuid values for x2apic When running as pv domain xen_cpuid() is being used instead of native_cpuid(). In xen_cpuid() the x2apic feature is indicated as not being present by special casing the related cpuid leaf. Instead of delivering fake cpuid values clear the cpu capability bit for x2apic instead. Signed-off-by: Juergen Gross <jgross@...e.com> --- arch/x86/xen/enlighten_pv.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index d43382284ada..38dec28a8e6d 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -286,8 +286,6 @@ static void __init xen_init_cpuid_mask(void) unsigned int ax, bx, cx, dx; unsigned int xsave_mask; - cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_X2APIC % 32)); - ax = 1; cx = 0; cpuid(1, &ax, &bx, &cx, &dx); @@ -309,6 +307,7 @@ static void __init xen_init_capabilities(void) setup_clear_cpu_cap(X86_FEATURE_APERFMPERF); setup_clear_cpu_cap(X86_FEATURE_MTRR); setup_clear_cpu_cap(X86_FEATURE_ACC); + setup_clear_cpu_cap(X86_FEATURE_X2APIC); if (!xen_initial_domain()) setup_clear_cpu_cap(X86_FEATURE_ACPI); -- 2.12.0
Powered by blists - more mailing lists