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[PATCH v2 1/9] x86/domain: Ensure a vCPU's FPU is reset early
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
- Date: Tue, 24 Mar 2026 18:19:29 +0000
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
- Delivery-date: Tue, 24 Mar 2026 18:19:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
When using eager-fpu, a vCPU's FPU is always marked as initialized on
context switch but it is possible that neither vcpu_reset_fpu() nor
vcpu_setup_fpu() has been called on it. If that happens,
arch_get_info_guest() would return a block of all 0's for the FPU
context claiming it to be valid.
Fix this by calling vcpu_reset_fpu() during vCPU creation.
Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
New in v2
xen/arch/x86/domain.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 9ba2774762cc..82da1c5d7b38 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -522,6 +522,8 @@ int arch_vcpu_create(struct vcpu *v)
if ( (rc = vcpu_init_fpu(v)) != 0 )
return rc;
+ vcpu_reset_fpu(v);
+
vmce_init_vcpu(v);
arch_vcpu_regs_init(v);
--
2.53.0
|
