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d="scan'208";a="97511809" From: Andrew Cooper To: Xen-devel CC: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu Subject: [PATCH 2/3] x86/kexec: Simplify the relocation of compat_mode_gdt_desc Date: Fri, 17 Feb 2023 17:48:13 +0000 Message-ID: <20230217174814.1006961-3-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230217174814.1006961-1-andrew.cooper3@citrix.com> References: <20230217174814.1006961-1-andrew.cooper3@citrix.com> 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: 1676656172370100003 Assemble the GDT base relative to kexec_reloc, and simply add the identity = map base address to relocate. Adjust a stale comment, and drop the unused matching label. No functional change. Signed-off-by: Andrew Cooper --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 CC: Wei Liu --- xen/arch/x86/x86_64/kexec_reloc.S | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/xen/arch/x86/x86_64/kexec_reloc.S b/xen/arch/x86/x86_64/kexec_= reloc.S index 035164e96f38..a81f64146190 100644 --- a/xen/arch/x86/x86_64/kexec_reloc.S +++ b/xen/arch/x86/x86_64/kexec_reloc.S @@ -72,7 +72,6 @@ ENTRY(kexec_reloc) testq $KEXEC_RELOC_FLAG_COMPAT, %r8 jnz .L_call_32_bit =20 -.L_call_64_bit: /* Call the image entry point. This should never return. */ callq *%rbp ud2 @@ -81,9 +80,8 @@ ENTRY(kexec_reloc) /* Setup IDT. */ lidt compat_mode_idt(%rip) =20 - /* Load compat GDT. */ - leaq compat_mode_gdt(%rip), %rax - movq %rax, (compat_mode_gdt_desc + 2)(%rip) + /* Relocate and load compat GDT. */ + add %rdi, 2 + compat_mode_gdt_desc(%rip) lgdt compat_mode_gdt_desc(%rip) =20 /* Enter compatibility mode. */ @@ -172,7 +170,7 @@ compatibility_mode: .align 4 compat_mode_gdt_desc: .word .Lcompat_mode_gdt_end - compat_mode_gdt -1 - .quad 0x0000000000000000 /* set in call_32_bit above */ + .quad . - kexec_reloc /* Relocated before use */ =20 .type compat_mode_gdt_desc, @object .size compat_mode_gdt_desc, . - compat_mode_gdt_desc --=20 2.30.2