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From: Jan Beulich <jbeulich@suse.com>
To: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
	"George Dunlap" <george.dunlap@citrix.com>,
	"Wei Liu" <wl@xen.org>, "Roger Pau Monné" <roger.pau@citrix.com>
Subject: [PATCH v3 11/22] x86/CPUID: move bounding of max_{,sub}leaf fields to library code
Date: Thu, 22 Apr 2021 16:50:39 +0200	[thread overview]
Message-ID: <079ec0a9-fde7-e7a9-40d1-bea50a0c9a0a@suse.com> (raw)
In-Reply-To: <322de6db-e01f-0b57-5777-5d94a13c441a@suse.com>

Break out this logic from calculate_host_policy() to also use it in the
x86 emulator harness, where subsequently we'll want to avoid open-coding
AMX maximum palette bounding.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
v2: New.

--- a/tools/tests/x86_emulator/x86-emulate.c
+++ b/tools/tests/x86_emulator/x86-emulate.c
@@ -79,6 +79,7 @@ bool emul_test_init(void)
     unsigned long sp;
 
     x86_cpuid_policy_fill_native(&cp);
+    x86_cpuid_policy_bound_max_leaves(&cp);
 
     /*
      * The emulator doesn't use these instructions, so can always emulate
@@ -91,6 +92,8 @@ bool emul_test_init(void)
     cp.feat.rdpid = true;
     cp.extd.clzero = true;
 
+    x86_cpuid_policy_shrink_max_leaves(&cp);
+
     if ( cpu_has_xsave )
     {
         unsigned int tmp, ebx;
--- a/xen/arch/x86/cpuid.c
+++ b/xen/arch/x86/cpuid.c
@@ -322,12 +322,7 @@ static void __init calculate_host_policy
 
     *p = raw_cpuid_policy;
 
-    p->basic.max_leaf =
-        min_t(uint32_t, p->basic.max_leaf,   ARRAY_SIZE(p->basic.raw) - 1);
-    p->feat.max_subleaf =
-        min_t(uint32_t, p->feat.max_subleaf, ARRAY_SIZE(p->feat.raw) - 1);
-    p->extd.max_leaf = 0x80000000 | min_t(uint32_t, p->extd.max_leaf & 0xffff,
-                                          ARRAY_SIZE(p->extd.raw) - 1);
+    x86_cpuid_policy_bound_max_leaves(p);
 
     cpuid_featureset_to_policy(boot_cpu_data.x86_capability, p);
     recalculate_xstate(p);
--- a/xen/include/xen/lib/x86/cpuid.h
+++ b/xen/include/xen/lib/x86/cpuid.h
@@ -352,6 +352,12 @@ void x86_cpuid_policy_fill_native(struct
 void x86_cpuid_policy_clear_out_of_range_leaves(struct cpuid_policy *p);
 
 /**
+ * Bound max leaf/subleaf values according to the capacity of the respective
+ * arrays in struct cpuid_policy.
+ */
+void x86_cpuid_policy_bound_max_leaves(struct cpuid_policy *p);
+
+/**
  * Shrink max leaf/subleaf values such that the last respective valid entry
  * isn't all blank.  While permitted by the spec, such extraneous leaves may
  * provide undue "hints" to guests.
--- a/xen/lib/x86/cpuid.c
+++ b/xen/lib/x86/cpuid.c
@@ -238,6 +238,16 @@ void x86_cpuid_policy_clear_out_of_range
                 ARRAY_SIZE(p->extd.raw) - 1);
 }
 
+void x86_cpuid_policy_bound_max_leaves(struct cpuid_policy *p)
+{
+    p->basic.max_leaf =
+        min_t(uint32_t, p->basic.max_leaf, ARRAY_SIZE(p->basic.raw) - 1);
+    p->feat.max_subleaf =
+        min_t(uint32_t, p->feat.max_subleaf, ARRAY_SIZE(p->feat.raw) - 1);
+    p->extd.max_leaf = 0x80000000 | min_t(uint32_t, p->extd.max_leaf & 0xffff,
+                                          ARRAY_SIZE(p->extd.raw) - 1);
+}
+
 void x86_cpuid_policy_shrink_max_leaves(struct cpuid_policy *p)
 {
     unsigned int i;



  parent reply	other threads:[~2021-04-22 14:50 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22 14:38 [PATCH v3 00/22] xvmalloc() / x86 xstate area / x86 CPUID / AMX+XFD Jan Beulich
2021-04-22 14:43 ` [PATCH v3 01/22] mm: introduce xvmalloc() et al and use for grant table allocations Jan Beulich
2021-05-03 11:31   ` Roger Pau Monné
2021-05-03 13:50     ` Jan Beulich
2021-05-03 14:54       ` Roger Pau Monné
2021-05-03 15:21         ` Jan Beulich
2021-05-03 16:39           ` Roger Pau Monné
2021-04-22 14:44 ` [PATCH v3 02/22] x86/xstate: use xvzalloc() for save area allocation Jan Beulich
2021-05-05 13:29   ` Roger Pau Monné
2021-04-22 14:44 ` [PATCH v3 03/22] x86/xstate: re-size save area when CPUID policy changes Jan Beulich
2021-05-03 13:57   ` Andrew Cooper
2021-05-03 14:22     ` Jan Beulich
2021-05-11 16:41       ` Andrew Cooper
2021-05-17  7:33         ` Jan Beulich
2021-04-22 14:45 ` [PATCH v3 04/22] x86/xstate: re-use valid_xcr0() for boot-time checks Jan Beulich
2021-05-03 11:53   ` Andrew Cooper
2021-04-22 14:45 ` [PATCH v3 05/22] x86/xstate: drop xstate_offsets[] and xstate_sizes[] Jan Beulich
2021-05-03 16:10   ` Andrew Cooper
2021-05-04  7:57     ` Jan Beulich
2021-04-22 14:46 ` [PATCH v3 06/22] x86/xstate: replace xsave_cntxt_size and drop XCNTXT_MASK Jan Beulich
2021-04-22 14:47 ` [PATCH v3 07/22] x86/xstate: avoid accounting for unsupported components Jan Beulich
2021-04-22 14:47 ` [PATCH v3 08/22] x86: use xvmalloc() for extended context buffer allocations Jan Beulich
2021-04-22 14:48 ` [PATCH v3 09/22] x86/xstate: enable AMX components Jan Beulich
2021-04-22 14:50 ` [PATCH v3 10/22] x86/CPUID: adjust extended leaves out of range clearing Jan Beulich
2021-04-22 14:50 ` Jan Beulich [this message]
2021-04-22 14:51 ` [PATCH v3 12/22] x86/CPUID: enable AMX leaves Jan Beulich
2021-04-22 14:52 ` [PATCH v3 13/22] x86: XFD enabling Jan Beulich
2021-04-22 14:53 ` [PATCH v3 14/22] x86emul: introduce X86EMUL_FPU_{tilecfg,tile} Jan Beulich
2021-04-22 14:53 ` [PATCH v3 15/22] x86emul: support TILERELEASE Jan Beulich
2021-04-22 14:53 ` [PATCH v3 16/22] x86: introduce struct for TILECFG register Jan Beulich
2021-04-22 14:54 ` [PATCH v3 17/22] x86emul: support {LD,ST}TILECFG Jan Beulich
2021-04-22 14:55 ` [PATCH v3 18/22] x86emul: support TILEZERO Jan Beulich
2021-04-22 14:55 ` [PATCH v3 19/22] x86emul: support TILELOADD{,T1} and TILESTORE Jan Beulich
2021-04-22 15:06   ` Jan Beulich
2021-04-22 15:11     ` Jan Beulich
2021-04-26  7:12       ` Paul Durrant
2021-04-29  9:40         ` Jan Beulich
2021-04-22 14:56 ` [PATCH v3 20/22] x86emul: support tile multiplication insns Jan Beulich
2021-04-22 14:57 ` [PATCH v3 21/22] x86emul: test AMX insns Jan Beulich
2021-04-22 14:57 ` [PATCH v3 22/22] x86: permit guests to use AMX and XFD Jan Beulich

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