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x86/xen/pvh: Enable PAE mode for 32-bit guest only when CONFIG_X86_PAE is set

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The PVH entry is available for 32-bit KVM guests, and 32-bit KVM guests
do not depend on CONFIG_X86_PAE. However, mk_early_pgtbl_32() builds
different pagetables depending on whether CONFIG_X86_PAE is set.
Therefore, enabling PAE mode for 32-bit KVM guests without
CONFIG_X86_PAE being set would result in a boot failure during CR3
loading.

Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <d09ce9a134eb9cbc16928a5b316969f8ba606b81.1768017442.git.houwenlong.hwl@antgroup.com>
This commit is contained in:
Hou Wenlong
2026-01-10 12:00:08 +08:00
committed by Juergen Gross
parent 378f1dc3d6
commit db9aded979
1 changed files with 2 additions and 0 deletions
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2
arch/x86/platform/pvh/head.S
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@@ -91,10 +91,12 @@ SYM_CODE_START(pvh_start_xen)
leal rva(early_stack_end)(%ebp), %esp
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
/* Enable PAE mode. */
mov %cr4, %eax
orl $X86_CR4_PAE, %eax
mov %eax, %cr4
#endif
#ifdef CONFIG_X86_64
/* Enable Long mode. */