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[PATCH v4 04/28] x86/xstate: avoid accounting for unsupported components
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 11 Nov 2026 16:08:20 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- Delivery-date: Wed, 11 Nov 2026 15:08:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
There's no point in including unsupported components in the size
calculations of xstate_{alloc,update}_save_area().
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/xstate.c
+++ b/xen/arch/x86/xstate.c
@@ -521,8 +521,12 @@ int xstate_alloc_save_area(struct vcpu *
unsigned int i;
for ( size = 0, i = 2; i < xstate_features; ++i )
+ {
+ if ( !(xfeature_mask & (1ul << i)) )
+ continue;
if ( size < xstate_size(i) )
size = xstate_size(i);
+ }
size += XSTATE_AREA_MIN_SIZE;
}
@@ -574,6 +578,8 @@ int xstate_update_save_area(struct vcpu
for ( size = old = XSTATE_AREA_MIN_SIZE, i = 2; i < xstate_features; ++i )
{
+ if ( !(xfeature_mask & (1ul << i)) )
+ continue;
if ( xcr0_max & (1ul << i) )
size = max(size, xstate_offset(i) + xstate_size(i));
if ( v->arch.xcr0_accum & (1ul << i) )
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