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xen: assume XENFEAT_mmu_pt_update_preserve_ad being set for pv guests

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XENFEAT_mmu_pt_update_preserve_ad is always set in Xen 4.0 and newer.
Remove coding assuming it might be zero.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210730071804.4302-3-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2021-07-30 09:18:03 +02:00
parent ac4c403c90
commit 2526cff7c4
2 changed files with 4 additions and 12 deletions
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12
arch/x86/xen/enlighten_pv.c
View file

@ -116,9 +116,8 @@ static void __init xen_banner(void)
HYPERVISOR_xen_version(XENVER_extraversion, &extra);
pr_info("Booting paravirtualized kernel on %s\n", pv_info.name);
printk(KERN_INFO "Xen version: %d.%d%s%s\n",
version >> 16, version & 0xffff, extra.extraversion,
xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
pr_info("Xen version: %d.%d%s (preserve-AD)\n",
version >> 16, version & 0xffff, extra.extraversion);
}
static void __init xen_pv_init_platform(void)
@ -1302,13 +1301,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
xen_init_apic();
#endif
if (xen_feature(XENFEAT_mmu_pt_update_preserve_ad)) {
pv_ops.mmu.ptep_modify_prot_start =
xen_ptep_modify_prot_start;
pv_ops.mmu.ptep_modify_prot_commit =
xen_ptep_modify_prot_commit;
}
machine_ops = xen_machine_ops;
/*

4
arch/x86/xen/mmu_pv.c
View file

@ -2099,8 +2099,8 @@ static const struct pv_mmu_ops xen_mmu_ops __initconst = {
.set_pte = xen_set_pte_init,
.set_pmd = xen_set_pmd_hyper,
.ptep_modify_prot_start = __ptep_modify_prot_start,
.ptep_modify_prot_commit = __ptep_modify_prot_commit,
.ptep_modify_prot_start = xen_ptep_modify_prot_start,
.ptep_modify_prot_commit = xen_ptep_modify_prot_commit,
.pte_val = PV_CALLEE_SAVE(xen_pte_val),
.pgd_val = PV_CALLEE_SAVE(xen_pgd_val),