[xen staging] x86: Move SVM features exposed to guest into hvm_max_cpu_policy

[patchbot@xxxxxxx]

commit 4f8b0e94d7ca941876760abe29b31e17e3f593ce
Author:     George Dunlap <george.dunlap@xxxxxxxxx>
AuthorDate: Mon Feb 26 16:10:07 2024 +0000
Commit:     George Dunlap <george.dunlap@xxxxxxxxx>
CommitDate: Wed Mar 27 11:44:52 2024 +0000

    x86: Move SVM features exposed to guest into hvm_max_cpu_policy
    
    Currently (nested) SVM features we're willing to expose to the guest
    are defined in calculate_host_policy, and stored in host_cpu_policy.
    This is the wrong place for this; move it into
    calculate_hvm_max_policy(), and store it in hvm_max_cpu_policy.
    
    Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/cpu-policy.c | 30 +++++++++++++++++-------------
 1 file changed, 17 insertions(+), 13 deletions(-)

diff --git a/xen/arch/x86/cpu-policy.c b/xen/arch/x86/cpu-policy.c
index 2acc27632f..bd047456eb 100644
--- a/xen/arch/x86/cpu-policy.c
+++ b/xen/arch/x86/cpu-policy.c
@@ -398,19 +398,6 @@ static void __init calculate_host_policy(void)
     if ( vpmu_mode == XENPMU_MODE_OFF )
         p->basic.raw[0xa] = EMPTY_LEAF;
 
-    if ( p->extd.svm )
-    {
-        /* Clamp to implemented features which require hardware support. */
-        p->extd.raw[0xa].d &= ((1u << SVM_FEATURE_NPT) |
-                               (1u << SVM_FEATURE_LBRV) |
-                               (1u << SVM_FEATURE_NRIPS) |
-                               (1u << SVM_FEATURE_PAUSEFILTER) |
-                               (1u << SVM_FEATURE_DECODEASSISTS));
-        /* Enable features which are always emulated. */
-        p->extd.raw[0xa].d |= ((1u << SVM_FEATURE_VMCBCLEAN) |
-                               (1u << SVM_FEATURE_TSCRATEMSR));
-    }
-
     /* 0x000000ce  MSR_INTEL_PLATFORM_INFO */
     /* probe_cpuid_faulting() sanity checks presence of MISC_FEATURES_ENABLES 
*/
     p->platform_info.cpuid_faulting = cpu_has_cpuid_faulting;
@@ -741,6 +728,23 @@ static void __init calculate_hvm_max_policy(void)
     if ( !cpu_has_vmx )
         __clear_bit(X86_FEATURE_PKS, fs);
 
+    /* 
+     * Make adjustments to possible (nested) virtualization features exposed
+     * to the guest
+     */
+    if ( p->extd.svm )
+    {
+        /* Clamp to implemented features which require hardware support. */
+        p->extd.raw[0xa].d &= ((1u << SVM_FEATURE_NPT) |
+                               (1u << SVM_FEATURE_LBRV) |
+                               (1u << SVM_FEATURE_NRIPS) |
+                               (1u << SVM_FEATURE_PAUSEFILTER) |
+                               (1u << SVM_FEATURE_DECODEASSISTS));
+        /* Enable features which are always emulated. */
+        p->extd.raw[0xa].d |= ((1u << SVM_FEATURE_VMCBCLEAN) |
+                               (1u << SVM_FEATURE_TSCRATEMSR));
+    }
+    
     guest_common_max_feature_adjustments(fs);
     guest_common_feature_adjustments(fs);
 
--
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