From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Xen-devel <xen-devel@lists.xen.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: [PATCH v5 05/21] xen/x86: Improve disabling of features which have dependencies
Date: Thu, 7 Apr 2016 12:57:10 +0100 [thread overview]
Message-ID: <1460030246-30153-6-git-send-email-andrew.cooper3@citrix.com> (raw)
In-Reply-To: <1460030246-30153-1-git-send-email-andrew.cooper3@citrix.com>
APIC and XSAVE have dependent features, which also need disabling if Xen
chooses to disable a feature.
Use setup_clear_cpu_cap() rather than clear_bit(), as it takes care of
dependent features as well.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <JBeulich@suse.com>
---
v2: Move boolean_param() adjacent to use_xsave in xstate_init()
---
xen/arch/x86/apic.c | 2 +-
xen/arch/x86/cpu/common.c | 12 +++---------
xen/arch/x86/xstate.c | 6 +++++-
3 files changed, 9 insertions(+), 11 deletions(-)
diff --git a/xen/arch/x86/apic.c b/xen/arch/x86/apic.c
index b9601ad..8df5bd3 100644
--- a/xen/arch/x86/apic.c
+++ b/xen/arch/x86/apic.c
@@ -1349,7 +1349,7 @@ void pmu_apic_interrupt(struct cpu_user_regs *regs)
int __init APIC_init_uniprocessor (void)
{
if (enable_local_apic < 0)
- __clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
+ setup_clear_cpu_cap(X86_FEATURE_APIC);
if (!smp_found_config && !cpu_has_apic) {
skip_ioapic_setup = 1;
diff --git a/xen/arch/x86/cpu/common.c b/xen/arch/x86/cpu/common.c
index 0942b44..b5c023f 100644
--- a/xen/arch/x86/cpu/common.c
+++ b/xen/arch/x86/cpu/common.c
@@ -16,9 +16,6 @@
#include "cpu.h"
-static bool_t use_xsave = 1;
-boolean_param("xsave", use_xsave);
-
bool_t opt_arat = 1;
boolean_param("arat", opt_arat);
@@ -341,12 +338,6 @@ void identify_cpu(struct cpuinfo_x86 *c)
if (this_cpu->c_init)
this_cpu->c_init(c);
- /* Initialize xsave/xrstor features */
- if ( !use_xsave )
- __clear_bit(X86_FEATURE_XSAVE, boot_cpu_data.x86_capability);
-
- if ( cpu_has_xsave )
- xstate_init(c);
if ( !opt_pku )
setup_clear_cpu_cap(X86_FEATURE_PKU);
@@ -370,6 +361,9 @@ void identify_cpu(struct cpuinfo_x86 *c)
/* Now the feature flags better reflect actual CPU features! */
+ if ( cpu_has_xsave )
+ xstate_init(c);
+
#ifdef NOISY_CAPS
printk(KERN_DEBUG "CPU: After all inits, caps:");
for (i = 0; i < NCAPINTS; i++)
diff --git a/xen/arch/x86/xstate.c b/xen/arch/x86/xstate.c
index 8c652bc..4a6c9f6 100644
--- a/xen/arch/x86/xstate.c
+++ b/xen/arch/x86/xstate.c
@@ -534,11 +534,15 @@ unsigned int xstate_ctxt_size(u64 xcr0)
/* Collect the information of processor's extended state */
void xstate_init(struct cpuinfo_x86 *c)
{
+ static bool_t __initdata use_xsave = 1;
+ boolean_param("xsave", use_xsave);
+
bool_t bsp = c == &boot_cpu_data;
u32 eax, ebx, ecx, edx;
u64 feature_mask;
- if ( boot_cpu_data.cpuid_level < XSTATE_CPUID )
+ if ( (bsp && !use_xsave) ||
+ boot_cpu_data.cpuid_level < XSTATE_CPUID )
{
BUG_ON(!bsp);
setup_clear_cpu_cap(X86_FEATURE_XSAVE);
--
2.1.4
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next prev parent reply other threads:[~2016-04-07 11:57 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-07 11:57 [PATCH v5 00/21] x86: Improvements to cpuid handling for guests Andrew Cooper
2016-04-07 11:57 ` [PATCH v5 01/21] xen/x86: Annotate VM applicability in featureset Andrew Cooper
2016-04-07 23:01 ` Jan Beulich
2016-04-07 11:57 ` [PATCH v5 02/21] xen/x86: Calculate maximum host and guest featuresets Andrew Cooper
2016-04-07 23:04 ` Jan Beulich
2016-04-07 11:57 ` [PATCH v5 03/21] xen/x86: Generate deep dependencies of features Andrew Cooper
2016-04-07 23:18 ` Jan Beulich
2016-04-07 23:36 ` Andrew Cooper
2016-04-08 15:17 ` Jan Beulich
2016-04-08 15:18 ` Andrew Cooper
2016-04-07 11:57 ` [PATCH v5 04/21] xen/x86: Clear dependent features when clearing a cpu cap Andrew Cooper
2016-04-08 15:36 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` Andrew Cooper [this message]
2016-04-08 15:04 ` [PATCH v5 05/21] xen/x86: Improve disabling of features which have dependencies Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 06/21] xen/x86: Improvements to in-hypervisor cpuid sanity checks Andrew Cooper
2016-04-08 16:10 ` Konrad Rzeszutek Wilk
2016-04-08 18:06 ` Jan Beulich
2016-04-07 11:57 ` [PATCH v5 07/21] x86/cpu: Move set_cpumask() calls into c_early_init() Andrew Cooper
2016-04-08 18:09 ` Jan Beulich
2016-04-07 11:57 ` [PATCH v5 08/21] x86/cpu: Sysctl and common infrastructure for levelling context switching Andrew Cooper
2016-04-07 16:54 ` Daniel De Graaf
2016-04-08 16:12 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 09/21] x86/cpu: Rework AMD masking MSR setup Andrew Cooper
2016-04-08 16:13 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 10/21] x86/cpu: Rework Intel masking/faulting setup Andrew Cooper
2016-04-08 16:14 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 11/21] x86/cpu: Context switch cpuid masks and faulting state in context_switch() Andrew Cooper
2016-04-08 16:15 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 12/21] x86/pv: Provide custom cpumasks for PV domains Andrew Cooper
2016-04-08 16:17 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 13/21] x86/domctl: Update PV domain cpumasks when setting cpuid policy Andrew Cooper
2016-04-08 16:26 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 14/21] xen+tools: Export maximum host and guest cpu featuresets via SYSCTL Andrew Cooper
2016-04-07 16:54 ` Daniel De Graaf
2016-04-08 16:32 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 15/21] tools/libxc: Modify bitmap operations to take void pointers Andrew Cooper
2016-04-07 13:00 ` Wei Liu
2016-04-08 16:34 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 16/21] tools/libxc: Use public/featureset.h for cpuid policy generation Andrew Cooper
2016-04-08 16:37 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 17/21] tools/libxc: Expose the automatically generated cpu featuremask information Andrew Cooper
2016-04-08 16:38 ` Konrad Rzeszutek Wilk
2016-04-07 11:57 ` [PATCH v5 18/21] tools: Utility for dealing with featuresets Andrew Cooper
2016-04-07 11:57 ` [PATCH v5 19/21] tools/libxc: Wire a featureset through to cpuid policy logic Andrew Cooper
2016-04-07 11:57 ` [PATCH v5 20/21] tools/libxc: Use featuresets rather than guesswork Andrew Cooper
2016-04-07 11:57 ` [PATCH v5 21/21] tools/libxc: Calculate xstate cpuid leaf from guest information Andrew Cooper
2016-04-07 12:58 ` Wei Liu
2016-04-08 21:00 ` Jan Beulich
2016-04-08 21:45 ` Andrew Cooper
2016-04-08 22:38 ` Jan Beulich
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