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Mon, 11 Nov 2024 02:49:05 -0800 (PST) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Frediano Ziglio Subject: [PATCH] x86/trampoline: Change type of trampoline_phys to uint32_t Date: Mon, 11 Nov 2024 10:49:02 +0000 Message-Id: <20241111104902.985611-1-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.39.5 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1731322180359116600 As now documented, this variable holds a page aligned value less than 1M. However, head.S fills it using 4-byte stores, and reloc_trampoline() is compiled for both 32bit and 64bit, where unsigned long is a different size. This happens to work because of the range of the value, but switch to uint3= 2_t to make it explicit. Signed-off-by: Andrew Cooper Acked-by: Jan Beulich --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Frediano Ziglio Bloat-o-meter reports a marginal code-gen improvement: add/remove: 0/0 grow/shrink: 5/7 up/down: 26/-85 (-59) Function old new delta enter_state_helper.cold 1091 1100 +9 __start_xen 8827 8835 +8 __cpu_up.cold 199 204 +5 intel_unlock_cpuid_leaves 102 104 +2 acpi_enter_sleep_state 397 399 +2 efi_arch_memory_setup 538 537 -1 arch_init_memory 632 631 -1 trampoline_phys 8 4 -4 do_platform_op 5439 5431 -8 compat_platform_op 5450 5442 -8 reloc_trampoline64 137 122 -15 __cpu_up 1513 1465 -48 --- xen/arch/x86/boot/reloc-trampoline.c | 2 +- xen/arch/x86/efi/efi-boot.h | 2 +- xen/arch/x86/include/asm/trampoline.h | 2 +- xen/arch/x86/smpboot.c | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-) diff --git a/xen/arch/x86/boot/reloc-trampoline.c b/xen/arch/x86/boot/reloc= -trampoline.c index 0a74c1e75a4c..d5548eb08f85 100644 --- a/xen/arch/x86/boot/reloc-trampoline.c +++ b/xen/arch/x86/boot/reloc-trampoline.c @@ -15,7 +15,7 @@ void reloc_trampoline64(void) #error Unknown architecture #endif { - unsigned long phys =3D trampoline_phys; + uint32_t phys =3D trampoline_phys; const int32_t *trampoline_ptr; =20 /* diff --git a/xen/arch/x86/efi/efi-boot.h b/xen/arch/x86/efi/efi-boot.h index 3133985c88f8..7930b7c73892 100644 --- a/xen/arch/x86/efi/efi-boot.h +++ b/xen/arch/x86/efi/efi-boot.h @@ -235,7 +235,7 @@ static void __init noreturn efi_arch_post_exit_boot(voi= d) u64 cr4 =3D XEN_MINIMAL_CR4 & ~X86_CR4_PGE, efer; =20 efi_arch_relocate_image(__XEN_VIRT_START - xen_phys_start); - memcpy((void *)trampoline_phys, trampoline_start, cfg.size); + memcpy(_p(trampoline_phys), trampoline_start, cfg.size); =20 /* * We're in physical mode right now (i.e. identity map), so a regular diff --git a/xen/arch/x86/include/asm/trampoline.h b/xen/arch/x86/include/a= sm/trampoline.h index 838c2f0b6fcd..8c1e0b48c2c9 100644 --- a/xen/arch/x86/include/asm/trampoline.h +++ b/xen/arch/x86/include/asm/trampoline.h @@ -52,7 +52,7 @@ extern char trampoline_start[], trampoline_end[]; * the 1M boundary (as the trampoline contains 16-bit code), and must be 4k * aligned (SIPI requirement for APs). */ -extern unsigned long trampoline_phys; +extern uint32_t trampoline_phys; =20 /* * Calculate the physical address of a symbol in the trampoline. diff --git a/xen/arch/x86/smpboot.c b/xen/arch/x86/smpboot.c index 9e79c1a6d6e6..7f0f57bb8ffe 100644 --- a/xen/arch/x86/smpboot.c +++ b/xen/arch/x86/smpboot.c @@ -39,7 +39,7 @@ #include #include =20 -unsigned long __read_mostly trampoline_phys; +uint32_t __ro_after_init trampoline_phys; enum ap_boot_method __read_mostly ap_boot_method =3D AP_BOOT_NORMAL; =20 /* representing HT siblings of each logical CPU */ --=20 2.39.5