From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- arch/powerpc/boot/reg.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 arch/powerpc/boot/reg.h (limited to 'arch/powerpc/boot/reg.h') diff --git a/arch/powerpc/boot/reg.h b/arch/powerpc/boot/reg.h new file mode 100644 index 000000000..fd8f4fcbf --- /dev/null +++ b/arch/powerpc/boot/reg.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _PPC_BOOT_REG_H +#define _PPC_BOOT_REG_H +/* + * Copyright 2007 Davud Gibson, IBM Corporation. + */ + +static inline u32 mfpvr(void) +{ + u32 pvr; + asm volatile ("mfpvr %0" : "=r"(pvr)); + return pvr; +} + +#define __stringify_1(x) #x +#define __stringify(x) __stringify_1(x) + +#define mfspr(rn) ({unsigned long rval; \ + asm volatile("mfspr %0," __stringify(rn) \ + : "=r" (rval)); rval; }) +#define mtspr(rn, v) asm volatile("mtspr " __stringify(rn) ",%0" : : "r" (v)) + +register void *__stack_pointer asm("r1"); +#define get_sp() (__stack_pointer) + +#endif /* _PPC_BOOT_REG_H */ -- cgit v1.3.1