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Re: [PATCH] x86/xen: fix secondary processor fpu initialization
- To: Juergen Gross <jgross@xxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Mon, 3 Jul 2023 13:51:57 -0400
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- Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 03 Jul 2023 17:52:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 7/3/23 9:00 AM, Juergen Gross wrote:
Moving the call of fpu__init_cpu() from cpu_init() to start_secondary()
broke Xen PV guests, as those don't call start_secondary() for APs.
Fix that by adding the call of fpu__init_cpu() to cpu_bringup(), which
is the Xen PV replacement of start_secondary().
Fixes: b81fac906a8f ("x86/fpu: Move FPU initialization into
arch_cpu_finalize_init()")
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
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