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x86/paravirt: Restrict PARAVIRT_XXL to 64-bit only

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PARAVIRT_XXL is exclusively utilized by XEN_PV, which is only compatible
with 64-bit machines.

Clearly designate PARAVIRT_XXL as 64-bit only and remove ifdefs to
support CONFIG_PGTABLE_LEVELS < 5.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250516123306.3812286-5-kirill.shutemov@linux.intel.com
This commit is contained in:
Kirill A. Shutemov 2025-05-16 15:33:06 +03:00 • committed by Ingo Molnar
parent 7212b58d6d
commit 09230b7554
4 changed files with 1 additions and 8 deletions
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1
arch/x86/Kconfig
View file

@ -799,6 +799,7 @@ config PARAVIRT
config PARAVIRT_XXL
bool
depends on X86_64
config PARAVIRT_DEBUG
bool "paravirt-ops debugging"

4
arch/x86/include/asm/paravirt.h
View file

@ -463,8 +463,6 @@ static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
PVOP_VCALL2(mmu.set_p4d, p4dp, val);
}
#if CONFIG_PGTABLE_LEVELS >= 5
static inline p4d_t __p4d(p4dval_t val)
{
p4dval_t ret = PVOP_ALT_CALLEE1(p4dval_t, mmu.make_p4d, val,
@ -496,8 +494,6 @@ static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd)
set_pgd(pgdp, native_make_pgd(0)); \
} while (0)
#endif /* CONFIG_PGTABLE_LEVELS == 5 */
static inline void p4d_clear(p4d_t *p4dp)
{
set_p4d(p4dp, native_make_p4d(0));

2
arch/x86/include/asm/paravirt_types.h
View file

@ -189,12 +189,10 @@ struct pv_mmu_ops {
void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
#if CONFIG_PGTABLE_LEVELS >= 5
struct paravirt_callee_save p4d_val;
struct paravirt_callee_save make_p4d;
void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
#endif /* CONFIG_PGTABLE_LEVELS >= 5 */
struct pv_lazy_ops lazy_mode;

2
arch/x86/kernel/paravirt.c
View file

@ -211,12 +211,10 @@ struct paravirt_patch_template pv_ops = {
.mmu.set_p4d = native_set_p4d,
#if CONFIG_PGTABLE_LEVELS >= 5
.mmu.p4d_val = PTE_IDENT,
.mmu.make_p4d = PTE_IDENT,
.mmu.set_pgd = native_set_pgd,
#endif /* CONFIG_PGTABLE_LEVELS >= 5 */
.mmu.pte_val = PTE_IDENT,
.mmu.pgd_val = PTE_IDENT,