From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Xen-devel <xen-devel@lists.xen.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: [PATCH v4 04/26] xen/x86: Mask out unknown features from Xen's capabilities
Date: Wed, 23 Mar 2016 16:36:07 +0000 [thread overview]
Message-ID: <1458750989-28967-5-git-send-email-andrew.cooper3@citrix.com> (raw)
In-Reply-To: <1458750989-28967-1-git-send-email-andrew.cooper3@citrix.com>
If Xen doesn't know about a feature, it is unsafe for use and should be
deliberately hidden from Xen's capabilities.
This doesn't make a practical difference yet, but will make a difference
later when the guest featuresets are seeded from the host featureset.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Jan Beulich <JBeulich@suse.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
v2:
* Reduced substantially from v1, by using the autogenerated information.
v3:
* Drop redundant braces.
---
xen/arch/x86/Makefile | 1 +
xen/arch/x86/cpu/common.c | 2 ++
xen/arch/x86/cpuid.c | 20 ++++++++++++++++++++
xen/include/asm-x86/cpufeature.h | 4 +---
xen/include/asm-x86/cpuid.h | 25 +++++++++++++++++++++++++
xen/tools/gen-cpuid.py | 24 ++++++++++++++++++++++++
6 files changed, 73 insertions(+), 3 deletions(-)
create mode 100644 xen/arch/x86/cpuid.c
create mode 100644 xen/include/asm-x86/cpuid.h
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 1bcb08b..729065b 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -12,6 +12,7 @@ obj-y += bitops.o
obj-bin-y += bzimage.init.o
obj-bin-y += clear_page.o
obj-bin-y += copy_page.o
+obj-y += cpuid.o
obj-y += compat.o x86_64/compat.o
obj-$(CONFIG_KEXEC) += crash.o
obj-y += debug.o
diff --git a/xen/arch/x86/cpu/common.c b/xen/arch/x86/cpu/common.c
index 1a278b1..d302272 100644
--- a/xen/arch/x86/cpu/common.c
+++ b/xen/arch/x86/cpu/common.c
@@ -341,6 +341,8 @@ void identify_cpu(struct cpuinfo_x86 *c)
* The vendor-specific functions might have changed features. Now
* we do "generic changes."
*/
+ for (i = 0; i < FSCAPINTS; ++i)
+ c->x86_capability[i] &= known_features[i];
for (i = 0 ; i < NCAPINTS ; ++i)
c->x86_capability[i] &= ~cleared_caps[i];
diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
new file mode 100644
index 0000000..05cd646
--- /dev/null
+++ b/xen/arch/x86/cpuid.c
@@ -0,0 +1,20 @@
+#include <xen/init.h>
+#include <xen/lib.h>
+#include <asm/cpuid.h>
+
+const uint32_t known_features[] = INIT_KNOWN_FEATURES;
+
+static void __init __maybe_unused build_assertions(void)
+{
+ BUILD_BUG_ON(ARRAY_SIZE(known_features) != FSCAPINTS);
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-x86/cpufeature.h b/xen/include/asm-x86/cpufeature.h
index bcda09b..e29b024 100644
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -10,10 +10,8 @@
#endif
#include <xen/const.h>
-#include <asm/cpufeatureset.h>
-#include <asm/cpuid-autogen.h>
+#include <asm/cpuid.h>
-#define FSCAPINTS FEATURESET_NR_ENTRIES
#define NCAPINTS (FSCAPINTS + 1) /* N 32-bit words worth of info */
/* Other features, Xen-defined mapping. */
diff --git a/xen/include/asm-x86/cpuid.h b/xen/include/asm-x86/cpuid.h
new file mode 100644
index 0000000..b72d88f
--- /dev/null
+++ b/xen/include/asm-x86/cpuid.h
@@ -0,0 +1,25 @@
+#ifndef __X86_CPUID_H__
+#define __X86_CPUID_H__
+
+#include <asm/cpufeatureset.h>
+#include <asm/cpuid-autogen.h>
+
+#define FSCAPINTS FEATURESET_NR_ENTRIES
+
+#ifndef __ASSEMBLY__
+#include <xen/types.h>
+
+extern const uint32_t known_features[FSCAPINTS];
+
+#endif /* __ASSEMBLY__ */
+#endif /* !__X86_CPUID_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/tools/gen-cpuid.py b/xen/tools/gen-cpuid.py
index c6bd98d..44b4c98 100755
--- a/xen/tools/gen-cpuid.py
+++ b/xen/tools/gen-cpuid.py
@@ -19,6 +19,8 @@ class State(object):
# State calculated
self.nr_entries = 0 # Number of words in a featureset
+ self.common_1d = 0 # Common features between 1d and e1d
+ self.known = [] # All known features
def parse_definitions(state):
"""
@@ -95,6 +97,22 @@ def crunch_numbers(state):
# Size of bitmaps
state.nr_entries = nr_entries = (max(state.names.keys()) >> 5) + 1
+ # Features common between 1d and e1d.
+ common_1d = (FPU, VME, DE, PSE, TSC, MSR, PAE, MCE, CX8, APIC,
+ MTRR, PGE, MCA, CMOV, PAT, PSE36, MMX, FXSR)
+
+ # All known features. Duplicate the common features in e1d
+ e1d_base = SYSCALL & ~31
+ state.known = featureset_to_uint32s(
+ state.names.keys() + [ e1d_base + (x % 32) for x in common_1d ],
+ nr_entries)
+
+ # Fold common back into names
+ for f in common_1d:
+ state.names[e1d_base + (f % 32)] = "E1D_" + state.names[f]
+
+ state.common_1d = featureset_to_uint32s(common_1d, 1)[0]
+
def write_results(state):
state.output.write(
@@ -109,7 +127,13 @@ def write_results(state):
state.output.write(
"""
#define FEATURESET_NR_ENTRIES %sU
+
+#define CPUID_COMMON_1D_FEATURES %s
+
+#define INIT_KNOWN_FEATURES { \\\n%s\n}
""" % (state.nr_entries,
+ state.common_1d,
+ format_uint32s(state.known, 4),
))
state.output.write(
--
2.1.4
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next prev parent reply other threads:[~2016-03-23 16:36 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-23 16:36 [PATCH v4 00/26] x86: Improvements to cpuid handling for guests Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 01/26] xen/public: Export cpu featureset information in the public API Andrew Cooper
2016-03-24 14:08 ` Jan Beulich
2016-03-24 14:12 ` Andrew Cooper
2016-03-24 14:16 ` Jan Beulich
2016-03-23 16:36 ` [PATCH v4 02/26] xen/x86: Script to automatically process featureset information Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 03/26] xen/x86: Collect more cpuid feature leaves Andrew Cooper
2016-03-23 16:36 ` Andrew Cooper [this message]
2016-03-23 16:36 ` [PATCH v4 05/26] xen/x86: Annotate special features Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 06/26] xen/x86: Annotate VM applicability in featureset Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 07/26] xen/x86: Calculate maximum host and guest featuresets Andrew Cooper
2016-03-29 8:57 ` Jan Beulich
2016-03-23 16:36 ` [PATCH v4 08/26] xen/x86: Generate deep dependencies of features Andrew Cooper
2016-03-24 16:16 ` Jan Beulich
2016-03-23 16:36 ` [PATCH v4 09/26] xen/x86: Clear dependent features when clearing a cpu cap Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 10/26] xen/x86: Improve disabling of features which have dependencies Andrew Cooper
2016-03-28 15:18 ` Konrad Rzeszutek Wilk
2016-03-23 16:36 ` [PATCH v4 11/26] xen/x86: Improvements to in-hypervisor cpuid sanity checks Andrew Cooper
2016-03-24 15:38 ` Andrew Cooper
2016-03-24 16:47 ` Jan Beulich
2016-03-24 17:01 ` Andrew Cooper
2016-03-24 17:11 ` Jan Beulich
2016-03-24 17:12 ` Andrew Cooper
2016-03-28 15:29 ` Konrad Rzeszutek Wilk
2016-04-05 15:25 ` Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 12/26] x86/cpu: Move set_cpumask() calls into c_early_init() Andrew Cooper
2016-03-28 15:55 ` Konrad Rzeszutek Wilk
2016-04-05 16:19 ` Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 13/26] x86/cpu: Sysctl and common infrastructure for levelling context switching Andrew Cooper
2016-03-24 16:58 ` Jan Beulich
2016-03-28 16:12 ` Konrad Rzeszutek Wilk
2016-04-05 16:33 ` Andrew Cooper
2016-03-28 17:37 ` Konrad Rzeszutek Wilk
2016-03-23 16:36 ` [PATCH v4 14/26] x86/cpu: Rework AMD masking MSR setup Andrew Cooper
2016-03-28 18:55 ` Konrad Rzeszutek Wilk
2016-04-05 16:44 ` Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 15/26] x86/cpu: Rework Intel masking/faulting setup Andrew Cooper
2016-03-28 19:14 ` Konrad Rzeszutek Wilk
2016-04-05 16:45 ` Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 16/26] x86/cpu: Context switch cpuid masks and faulting state in context_switch() Andrew Cooper
2016-03-28 19:27 ` Konrad Rzeszutek Wilk
2016-04-05 18:34 ` Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 17/26] x86/pv: Provide custom cpumasks for PV domains Andrew Cooper
2016-03-28 19:40 ` Konrad Rzeszutek Wilk
2016-04-05 16:55 ` Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 18/26] x86/domctl: Update PV domain cpumasks when setting cpuid policy Andrew Cooper
2016-03-24 17:04 ` Jan Beulich
2016-03-24 17:05 ` Andrew Cooper
2016-03-28 19:51 ` Konrad Rzeszutek Wilk
2016-03-23 16:36 ` [PATCH v4 19/26] xen+tools: Export maximum host and guest cpu featuresets via SYSCTL Andrew Cooper
2016-03-28 19:59 ` Konrad Rzeszutek Wilk
2016-03-23 16:36 ` [PATCH v4 20/26] tools/libxc: Modify bitmap operations to take void pointers Andrew Cooper
2016-03-28 20:05 ` Konrad Rzeszutek Wilk
2016-03-23 16:36 ` [PATCH v4 21/26] tools/libxc: Use public/featureset.h for cpuid policy generation Andrew Cooper
2016-03-28 20:07 ` Konrad Rzeszutek Wilk
2016-03-23 16:36 ` [PATCH v4 22/26] tools/libxc: Expose the automatically generated cpu featuremask information Andrew Cooper
2016-03-28 20:08 ` Konrad Rzeszutek Wilk
2016-03-23 16:36 ` [PATCH v4 23/26] tools: Utility for dealing with featuresets Andrew Cooper
2016-03-28 20:26 ` Konrad Rzeszutek Wilk
2016-03-23 16:36 ` [PATCH v4 24/26] tools/libxc: Wire a featureset through to cpuid policy logic Andrew Cooper
2016-03-28 20:39 ` Konrad Rzeszutek Wilk
2016-03-23 16:36 ` [PATCH v4 25/26] tools/libxc: Use featuresets rather than guesswork Andrew Cooper
2016-03-23 16:36 ` [PATCH v4 26/26] tools/libxc: Calculate xstate cpuid leaf from guest information Andrew Cooper
2016-03-24 17:20 ` Wei Liu
2016-03-31 7:48 ` Jan Beulich
2016-04-05 17:48 ` Andrew Cooper
2016-04-07 0:16 ` Jan Beulich
2016-04-07 0:40 ` Andrew Cooper
2016-04-07 0:56 ` Jan Beulich
2016-04-07 11:34 ` Andrew Cooper
2016-03-24 10:27 ` [PATCH v4 00/26] x86: Improvements to cpuid handling for guests Jan Beulich
2016-03-24 10:28 ` Andrew Cooper
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