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x86/paravirt: Remove PARAVIRT_DEBUG config option

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The only effect of CONFIG_PARAVIRT_DEBUG set is that instead of doing a call
using a NULL pointer a BUG() is being raised.

While the BUG() will be a little bit easier to analyse, the call of NULL isn't
really that difficult to find the reason for.

Remove the config option to make paravirt coding a little bit less annoying.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260105110520.21356-4-jgross@suse.com
This commit is contained in:
Juergen Gross 2026-01-05 12:05:02 +01:00 committed by Borislav Petkov (AMD)
parent e0b4904a40
commit d73298f015
3 changed files with 0 additions and 16 deletions
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7
arch/x86/Kconfig
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@ -809,13 +809,6 @@ config PARAVIRT_XXL
bool
depends on X86_64
config PARAVIRT_DEBUG
bool "paravirt-ops debugging"
depends on PARAVIRT && DEBUG_KERNEL
help
Enable to debug paravirt_ops internals. Specifically, BUG if
a paravirt_op is missing when it is called.
config PARAVIRT_SPINLOCKS
bool "Paravirtualization layer for spinlocks"
depends on PARAVIRT && SMP

1
arch/x86/include/asm/paravirt.h
View File

@ -12,7 +12,6 @@
#include <asm/nospec-branch.h>
#ifndef __ASSEMBLER__
#include <linux/bug.h>
#include <linux/types.h>
#include <linux/cpumask.h>
#include <linux/static_call_types.h>

8
arch/x86/include/asm/paravirt_types.h
View File

@ -354,12 +354,6 @@ extern struct paravirt_patch_template pv_ops;
#define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
#endif /* CONFIG_X86_32 */
#ifdef CONFIG_PARAVIRT_DEBUG
#define PVOP_TEST_NULL(op) BUG_ON(pv_ops.op == NULL)
#else
#define PVOP_TEST_NULL(op) ((void)pv_ops.op)
#endif
#define PVOP_RETVAL(rettype) \
({ unsigned long __mask = ~0UL; \
BUILD_BUG_ON(sizeof(rettype) > sizeof(unsigned long)); \
@ -388,7 +382,6 @@ extern struct paravirt_patch_template pv_ops;
#define ____PVOP_CALL(ret, op, call_clbr, extra_clbr, ...) \
({ \
PVOP_CALL_ARGS; \
PVOP_TEST_NULL(op); \
asm volatile(ALTERNATIVE(PARAVIRT_CALL, ALT_CALL_INSTR, \
ALT_CALL_ALWAYS) \
: call_clbr, ASM_CALL_CONSTRAINT \
@ -402,7 +395,6 @@ extern struct paravirt_patch_template pv_ops;
extra_clbr, ...) \
({ \
PVOP_CALL_ARGS; \
PVOP_TEST_NULL(op); \
asm volatile(ALTERNATIVE_2(PARAVIRT_CALL, \
ALT_CALL_INSTR, ALT_CALL_ALWAYS, \
alt, cond) \