[v2,4/5] x86: remove X86_FEATURE_XENPV usage in setup_cpu_entry_area()
Commit Message
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 not supporting
32-bit mode.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
V2:
- new patch
---
arch/x86/mm/cpu_entry_area.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
Comments
On 11/4/22 00:27, Juergen Gross wrote:
> 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 not supporting
> 32-bit mode.
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
@@ -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