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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging] libx86: Split x86_cpuid_policy_fill_native() out of calculate_raw_policy()
commit c66ef0fbe12b3e1e2da849dd85e5b7fe3aa81de5
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Jul 19 16:50:03 2018 +0100
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon Nov 12 18:07:12 2018 +0000
libx86: Split x86_cpuid_policy_fill_native() out of calculate_raw_policy()
This will shortly be wanted by the userspace emulator harnesses as well.
Consolidate the cpuid{,_count}_leaf() helpers beside the structure
definition,
rather than having them scattered throughout Xen.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/x86/cpuid.c | 105 +-------------------------------------
xen/include/asm-x86/processor.h | 6 ---
xen/include/xen/lib/x86/cpuid.h | 23 +++++++++
xen/lib/x86/cpuid.c | 108 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 132 insertions(+), 110 deletions(-)
diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c
index d21e7459ac..0591a7dc60 100644
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -75,11 +75,6 @@ struct cpuid_policy __read_mostly raw_cpuid_policy,
__read_mostly pv_max_cpuid_policy,
__read_mostly hvm_max_cpuid_policy;
-static void cpuid_leaf(uint32_t leaf, struct cpuid_leaf *data)
-{
- cpuid(leaf, &data->a, &data->b, &data->c, &data->d);
-}
-
static void sanitise_featureset(uint32_t *fs)
{
/* for_each_set_bit() uses unsigned longs. Extend with zeroes. */
@@ -273,106 +268,8 @@ static void recalculate_misc(struct cpuid_policy *p)
static void __init calculate_raw_policy(void)
{
struct cpuid_policy *p = &raw_cpuid_policy;
- unsigned int i;
-
- cpuid_leaf(0, &p->basic.raw[0]);
- for ( i = 1; i < min(ARRAY_SIZE(p->basic.raw),
- p->basic.max_leaf + 1ul); ++i )
- {
- switch ( i )
- {
- case 0x4: case 0x7: case 0xb: case 0xd:
- /* Multi-invocation leaves. Deferred. */
- continue;
- }
-
- cpuid_leaf(i, &p->basic.raw[i]);
- }
-
- if ( p->basic.max_leaf >= 4 )
- {
- for ( i = 0; i < ARRAY_SIZE(p->cache.raw); ++i )
- {
- union {
- struct cpuid_leaf l;
- struct cpuid_cache_leaf c;
- } u;
-
- cpuid_count_leaf(4, i, &u.l);
-
- if ( u.c.type == 0 )
- break;
-
- p->cache.subleaf[i] = u.c;
- }
-
- /*
- * The choice of CPUID_GUEST_NR_CACHE is arbitrary. It is expected
- * that it will eventually need increasing for future hardware.
- */
- if ( i == ARRAY_SIZE(p->cache.raw) )
- printk(XENLOG_WARNING
- "CPUID: Insufficient Leaf 4 space for this hardware\n");
- }
-
- if ( p->basic.max_leaf >= 7 )
- {
- cpuid_count_leaf(7, 0, &p->feat.raw[0]);
-
- for ( i = 1; i < min(ARRAY_SIZE(p->feat.raw),
- p->feat.max_subleaf + 1ul); ++i )
- cpuid_count_leaf(7, i, &p->feat.raw[i]);
- }
-
- if ( p->basic.max_leaf >= 0xb )
- {
- union {
- struct cpuid_leaf l;
- struct cpuid_topo_leaf t;
- } u;
-
- for ( i = 0; i < ARRAY_SIZE(p->topo.raw); ++i )
- {
- cpuid_count_leaf(0xb, i, &u.l);
-
- if ( u.t.type == 0 )
- break;
-
- p->topo.subleaf[i] = u.t;
- }
-
- /*
- * The choice of CPUID_GUEST_NR_TOPO is per the manual. It may need
- * to grow for future hardware.
- */
- if ( i == ARRAY_SIZE(p->topo.raw) &&
- (cpuid_count_leaf(0xb, i, &u.l), u.t.type != 0) )
- printk(XENLOG_WARNING
- "CPUID: Insufficient Leaf 0xb space for this hardware\n");
- }
-
- if ( p->basic.max_leaf >= XSTATE_CPUID )
- {
- uint64_t xstates;
-
- cpuid_count_leaf(XSTATE_CPUID, 0, &p->xstate.raw[0]);
- cpuid_count_leaf(XSTATE_CPUID, 1, &p->xstate.raw[1]);
-
- xstates = ((uint64_t)(p->xstate.xcr0_high | p->xstate.xss_high) << 32)
|
- (p->xstate.xcr0_low | p->xstate.xss_low);
-
- for ( i = 2; i < min(63ul, ARRAY_SIZE(p->xstate.raw)); ++i )
- {
- if ( xstates & (1ul << i) )
- cpuid_count_leaf(XSTATE_CPUID, i, &p->xstate.raw[i]);
- }
- }
- /* Extended leaves. */
- cpuid_leaf(0x80000000, &p->extd.raw[0]);
- for ( i = 1; i < min(ARRAY_SIZE(p->extd.raw),
- p->extd.max_leaf + 1 - 0x80000000ul); ++i )
- cpuid_leaf(0x80000000 + i, &p->extd.raw[i]);
+ x86_cpuid_policy_fill_native(p);
p->x86_vendor = boot_cpu_data.x86_vendor;
}
diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index 03555e1dfe..df01ae30d7 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -263,12 +263,6 @@ static always_inline unsigned int cpuid_count_ebx(
return ebx;
}
-static always_inline void cpuid_count_leaf(uint32_t leaf, uint32_t subleaf,
- struct cpuid_leaf *data)
-{
- cpuid_count(leaf, subleaf, &data->a, &data->b, &data->c, &data->d);
-}
-
static inline unsigned long read_cr0(void)
{
unsigned long cr0;
diff --git a/xen/include/xen/lib/x86/cpuid.h b/xen/include/xen/lib/x86/cpuid.h
index 1e8283ab28..266c910fd3 100644
--- a/xen/include/xen/lib/x86/cpuid.h
+++ b/xen/include/xen/lib/x86/cpuid.h
@@ -20,6 +20,21 @@ struct cpuid_leaf
uint32_t a, b, c, d;
};
+static inline void cpuid_leaf(uint32_t leaf, struct cpuid_leaf *l)
+{
+ asm ( "cpuid"
+ : "=a" (l->a), "=b" (l->b), "=c" (l->c), "=d" (l->d)
+ : "a" (leaf) );
+}
+
+static inline void cpuid_count_leaf(
+ uint32_t leaf, uint32_t subleaf, struct cpuid_leaf *l)
+{
+ asm ( "cpuid"
+ : "=a" (l->a), "=b" (l->b), "=c" (l->c), "=d" (l->d)
+ : "a" (leaf), "c" (subleaf) );
+}
+
#define CPUID_GUEST_NR_BASIC (0xdu + 1)
#define CPUID_GUEST_NR_FEAT (0u + 1)
#define CPUID_GUEST_NR_CACHE (5u + 1)
@@ -243,6 +258,14 @@ static inline void cpuid_featureset_to_policy(
const uint32_t *x86_cpuid_lookup_deep_deps(uint32_t feature);
+/**
+ * Fill a CPUID policy using the native CPUID instruction.
+ *
+ * No sanitisation is performed. Values may be influenced by a hypervisor or
+ * from masking/faulting configuration.
+ */
+void x86_cpuid_policy_fill_native(struct cpuid_policy *p);
+
#ifdef __XEN__
#include <public/arch-x86/xen.h>
typedef XEN_GUEST_HANDLE_64(xen_cpuid_leaf_t) cpuid_leaf_buffer_t;
diff --git a/xen/lib/x86/cpuid.c b/xen/lib/x86/cpuid.c
index 9b40f55e03..f09d8d57c1 100644
--- a/xen/lib/x86/cpuid.c
+++ b/xen/lib/x86/cpuid.c
@@ -2,6 +2,114 @@
#include <xen/lib/x86/cpuid.h>
+void x86_cpuid_policy_fill_native(struct cpuid_policy *p)
+{
+ unsigned int i;
+
+ cpuid_leaf(0, &p->basic.raw[0]);
+ for ( i = 1; i < min(ARRAY_SIZE(p->basic.raw),
+ p->basic.max_leaf + 1ul); ++i )
+ {
+ switch ( i )
+ {
+ case 0x4: case 0x7: case 0xb: case 0xd:
+ /* Multi-invocation leaves. Deferred. */
+ continue;
+ }
+
+ cpuid_leaf(i, &p->basic.raw[i]);
+ }
+
+ if ( p->basic.max_leaf >= 4 )
+ {
+ for ( i = 0; i < ARRAY_SIZE(p->cache.raw); ++i )
+ {
+ union {
+ struct cpuid_leaf l;
+ struct cpuid_cache_leaf c;
+ } u;
+
+ cpuid_count_leaf(4, i, &u.l);
+
+ if ( u.c.type == 0 )
+ break;
+
+ p->cache.subleaf[i] = u.c;
+ }
+
+ /*
+ * The choice of CPUID_GUEST_NR_CACHE is arbitrary. It is expected
+ * that it will eventually need increasing for future hardware.
+ */
+#ifdef __XEN__
+ if ( i == ARRAY_SIZE(p->cache.raw) )
+ printk(XENLOG_WARNING
+ "CPUID: Insufficient Leaf 4 space for this hardware\n");
+#endif
+ }
+
+ if ( p->basic.max_leaf >= 7 )
+ {
+ cpuid_count_leaf(7, 0, &p->feat.raw[0]);
+
+ for ( i = 1; i < min(ARRAY_SIZE(p->feat.raw),
+ p->feat.max_subleaf + 1ul); ++i )
+ cpuid_count_leaf(7, i, &p->feat.raw[i]);
+ }
+
+ if ( p->basic.max_leaf >= 0xb )
+ {
+ union {
+ struct cpuid_leaf l;
+ struct cpuid_topo_leaf t;
+ } u;
+
+ for ( i = 0; i < ARRAY_SIZE(p->topo.raw); ++i )
+ {
+ cpuid_count_leaf(0xb, i, &u.l);
+
+ if ( u.t.type == 0 )
+ break;
+
+ p->topo.subleaf[i] = u.t;
+ }
+
+ /*
+ * The choice of CPUID_GUEST_NR_TOPO is per the manual. It may need
+ * to grow for future hardware.
+ */
+#ifdef __XEN__
+ if ( i == ARRAY_SIZE(p->topo.raw) &&
+ (cpuid_count_leaf(0xb, i, &u.l), u.t.type != 0) )
+ printk(XENLOG_WARNING
+ "CPUID: Insufficient Leaf 0xb space for this hardware\n");
+#endif
+ }
+
+ if ( p->basic.max_leaf >= 0xd )
+ {
+ uint64_t xstates;
+
+ cpuid_count_leaf(0xd, 0, &p->xstate.raw[0]);
+ cpuid_count_leaf(0xd, 1, &p->xstate.raw[1]);
+
+ xstates = ((uint64_t)(p->xstate.xcr0_high | p->xstate.xss_high) <<
32);
+ xstates |= (p->xstate.xcr0_low | p->xstate.xss_low);
+
+ for ( i = 2; i < min(63ul, ARRAY_SIZE(p->xstate.raw)); ++i )
+ {
+ if ( xstates & (1ul << i) )
+ cpuid_count_leaf(0xd, i, &p->xstate.raw[i]);
+ }
+ }
+
+ /* Extended leaves. */
+ cpuid_leaf(0x80000000, &p->extd.raw[0]);
+ for ( i = 1; i < min(ARRAY_SIZE(p->extd.raw),
+ p->extd.max_leaf + 1 - 0x80000000ul); ++i )
+ cpuid_leaf(0x80000000 + i, &p->extd.raw[i]);
+}
+
const uint32_t *x86_cpuid_lookup_deep_deps(uint32_t feature)
{
static const uint32_t deep_features[] = INIT_DEEP_FEATURES;
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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