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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: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20221104072701.20283-5-jgross@suse.com
This commit is contained in:
Juergen Gross 2022-11-04 08:27:00 +01:00 committed by Borislav Petkov
parent dfbd9e4059
commit d76c4f7a61
1 changed files with 2 additions and 6 deletions
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8
arch/x86/mm/cpu_entry_area.c
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@ -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