linux-kernel - [PATCH 5/6] xen/x86: there's no highmem anymore in PV mode

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Date:   Thu, 30 Sep 2021 14:36:56 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: [PATCH 5/6] xen/x86: there's no highmem anymore in PV mode

Considerations for it are a leftover from when 32-bit was still
supported.

Signed-off-by: Jan Beulich <jbeulich@...e.com>

--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -306,10 +306,6 @@ static void __init xen_update_mem_tables
 		BUG();
 	}
 
-	/* Update kernel mapping, but not for highmem. */
-	if (pfn >= PFN_UP(__pa(high_memory - 1)))
-		return;
-
 	if (HYPERVISOR_update_va_mapping((unsigned long)__va(pfn << PAGE_SHIFT),
 					 mfn_pte(mfn, PAGE_KERNEL), 0)) {
 		WARN(1, "Failed to update kernel mapping for mfn=%ld pfn=%ld\n",