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x86/build: Only align ENTRY_TEXT to PMD_SIZE if necessary

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PTI requires the begin and end of ENTRY_TEXT be aligned to PMD_SIZE.  SRSO
requires srso_alias_untrain_ret to be 2M aligned. This costs between 2-4 MiB
of RAM (depending on the size of the preceding section).  So, only align when
either of the two are enabled.

Co-developed-by: Jared White <jaredwhite@microsoft.com>
Signed-off-by: Jared White <jaredwhite@microsoft.com>
Signed-off-by: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/20260623152430.1473481-1-hamzamahfooz@linux.microsoft.com
This commit is contained in:
Hamza Mahfooz 2026-06-23 11:24:29 -04:00 committed by Ingo Molnar
parent 8cdeaa50ea
commit f6cff82087
1 changed files with 6 additions and 0 deletions
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6
arch/x86/kernel/vmlinux.lds.S
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@ -65,8 +65,14 @@ const_cpu_current_top_of_stack = cpu_current_top_of_stack;
__end_rodata_hpage_align = .; \
__end_rodata_aligned = .;
#if defined(CONFIG_MITIGATION_PAGE_TABLE_ISOLATION) || defined(CONFIG_MITIGATION_SRSO)
#define ALIGN_ENTRY_TEXT_BEGIN . = ALIGN(PMD_SIZE);
#define ALIGN_ENTRY_TEXT_END . = ALIGN(PMD_SIZE);
#else
#define ALIGN_ENTRY_TEXT_BEGIN
#define ALIGN_ENTRY_TEXT_END
#endif
#else
#define X86_ALIGN_RODATA_BEGIN