Commit d76c4f7a authored by Juergen Gross's avatar Juergen Gross Committed by Borislav Petkov
Browse files

x86/cpu: Remove X86_FEATURE_XENPV usage in setup_cpu_entry_area() 



Testing of X86_FEATURE_XENPV in setup_cpu_entry_area() can be removed,
as this code path is 32-bit only, and Xen PV guests are 64-bit only.

Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Acked-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20221104072701.20283-5-jgross@suse.com
parent dfbd9e40

arch/x86/mm/cpu_entry_area.c

+2 −6
Original line number Diff line number Diff line
@@ -138,17 +138,13 @@ static void __init setup_cpu_entry_area(unsigned int cpu) 
	pgprot_t tss_prot = PAGE_KERNEL_RO;

#else

	/*

	 * On native 32-bit systems, the GDT cannot be read-only because

	 * On 32-bit systems, the GDT cannot be read-only because

	 * our double fault handler uses a task gate, and entering through

	 * a task gate needs to change an available TSS to busy.  If the

	 * GDT is read-only, that will triple fault.  The TSS cannot be

	 * read-only because the CPU writes to it on task switches.

	 *

	 * On Xen PV, the GDT must be read-only because the hypervisor

	 * requires it.

	 */

	pgprot_t gdt_prot = boot_cpu_has(X86_FEATURE_XENPV) ?

		PAGE_KERNEL_RO : PAGE_KERNEL;

	pgprot_t gdt_prot = PAGE_KERNEL;

	pgprot_t tss_prot = PAGE_KERNEL;

#endif