Commit31ad7f8

bostrovs

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Ingo Molnar

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x86/vsyscall/64: Use proper accessor to update P4D entry

Writing to it directly does not work for Xen PV guests.Fixes:49275fe ("x86/vsyscall/64: Explicitly set _PAGE_USER in the pagetable hierarchy")Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>Signed-off-by: Thomas Gleixner <tglx@linutronix.de>Reviewed-by: Juergen Gross <jgross@suse.com>Acked-by: Andy Lutomirski <luto@kernel.org>Cc: stable@vger.kernel.orgLink:https://lkml.kernel.org/r/20180319143154.3742-1-boris.ostrovsky@oracle.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

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arch/x86/entry/vsyscall
- vsyscall_64.c

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`‎arch/x86/entry/vsyscall/vsyscall_64.c‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -347,7 +347,7 @@ void __init set_vsyscall_pgtable_user_bits(pgd_t *root)`
`347`	`347`	`set_pgd(pgd,__pgd(pgd_val(*pgd) \|_PAGE_USER));`
`348`	`348`	`p4d=p4d_offset(pgd,VSYSCALL_ADDR);`
`349`	`349`	`#ifCONFIG_PGTABLE_LEVELS >=5`
`350`		`-p4d->p4d \|=_PAGE_USER;`
	`350`	`+set_p4d(p4d,__p4d(p4d_val(*p4d) \|_PAGE_USER));`
`351`	`351`	`#endif`
`352`	`352`	`pud=pud_offset(p4d,VSYSCALL_ADDR);`
`353`	`353`	`set_pud(pud,__pud(pud_val(*pud) \|_PAGE_USER));`

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Commit31ad7f8

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`‎arch/x86/entry/vsyscall/vsyscall_64.c‎`

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