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From: "tip-bot2 for Juergen Gross" <tip-bot2@linutronix.de>
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To: linux-tip-commits@vger.kernel.org
Subject: [tip: x86/urgent] x86/xen: Fix secondary processors' FPU
initialization
Cc: Juergen Gross <jgross@suse.com>,
"Borislav Petkov (AMD)" <bp@alien8.de>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>, x86@kernel.org,
linux-kernel@vger.kernel.org
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[tip:,x86/urgent] x86/xen: Fix secondary processors' FPU initialization
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Commit Message
tip-bot2 for Thomas Gleixner
July 5, 2023, 10:40 a.m. UTC
The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: fe3e0a13e597c1c8617814bf9b42ab732db5c26e
Gitweb: https://git.kernel.org/tip/fe3e0a13e597c1c8617814bf9b42ab732db5c26e
Author: Juergen Gross <jgross@suse.com>
AuthorDate: Mon, 03 Jul 2023 15:00:32 +02:00
Committer: Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Wed, 05 Jul 2023 11:44:16 +02:00
x86/xen: Fix secondary processors' FPU initialization
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.
Call fpu__init_cpu() in Xen's 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@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230703130032.22916-1-jgross@suse.com
---
arch/x86/xen/smp_pv.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c index a9cf8c8..0b6efc4 100644 --- a/arch/x86/xen/smp_pv.c +++ b/arch/x86/xen/smp_pv.c @@ -63,6 +63,7 @@ static void cpu_bringup(void) cr4_init(); cpu_init(); + fpu__init_cpu(); touch_softlockup_watchdog(); /* PVH runs in ring 0 and allows us to do native syscalls. Yay! */