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um: Enable SMP support on x86

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Implement spinlock support for SMP on UML/x86, leveraging x86's
spinlock implementation. In addition, to support SMP on CPUs that
do not support CX8, some additional work is required. However,
considering that such CPUs are already very outdated, and x86 is
also removing support for them [1], let's enable SMP support only
on CPUs that support CX8.

[1] https://lore.kernel.org/lkml/20250515085708.2510123-1-mingo@kernel.org/

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Link: https://patch.msgid.link/20251027001815.1666872-9-tiwei.bie@linux.dev
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Tiwei Bie
2025-10-27 08:18:15 +08:00
committed by Johannes Berg
parent 8d74895527
commit aa3e6faf62
2 changed files with 11 additions and 0 deletions
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3
arch/x86/um/Kconfig
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@@ -9,8 +9,11 @@ endmenu
config UML_X86
def_bool y
select ARCH_BINFMT_ELF_EXTRA_PHDRS if X86_32
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_USE_QUEUED_SPINLOCKS
select DCACHE_WORD_ACCESS
select HAVE_EFFICIENT_UNALIGNED_ACCESS
select UML_SUBARCH_SUPPORTS_SMP if X86_CX8
config 64BIT
bool "64-bit kernel" if "$(SUBARCH)" = "x86"

8
arch/x86/um/asm/spinlock.h Normal file
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@@ -0,0 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_UM_SPINLOCK_H
#define __ASM_UM_SPINLOCK_H
#include <asm/qspinlock.h>
#include <asm/qrwlock.h>
#endif /* __ASM_UM_SPINLOCK_H */