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Thu, 26 Sep 2024 03:41:56 -0700 (PDT) Date: Thu, 26 Sep 2024 12:41:17 +0200 In-Reply-To: <20240926104113.80146-7-ardb+git@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240926104113.80146-7-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=904; i=ardb@kernel.org; h=from:subject; bh=SK89jirZxlyhNPfrfzxj4qoYkybGiruH5hLSJPLATEs=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIe2rlZ/E9V0L29KWOv/h8NISPt5Qf6nif2NoSM088ZqgV b0Oy9Z1lLIwiHEwyIopsgjM/vtu5+mJUrXOs2Rh5rAygQxh4OIUgIl81WD4Z7rxIf/2XQpOzxxi q5977XTzWHJUoKvkSs5y83eJYekuDxkZev2uM8t8FD0tYzvjxseQtEWvZX8cSOZMLDU648yRJyn GDwA= X-Mailer: git-send-email 2.46.0.792.g87dc391469-goog Message-ID: <20240926104113.80146-10-ardb+git@google.com> Subject: [PATCH 3/5] x86/pvh: Omit needless clearing of phys_base From: Ard Biesheuvel To: linux-kernel@vger.kernel.org Cc: Ard Biesheuvel , Jason Andryuk , Juergen Gross , Boris Ostrovsky , x86@kernel.org, xen-devel@lists.xenproject.org Content-Type: text/plain; charset="UTF-8" From: Ard Biesheuvel Since commit d9ec1158056b ("x86/boot/64: Use RIP_REL_REF() to assign 'phys_base'") phys_base is assigned directly rather than added to, so it is no longer necessary to clear it after use. Signed-off-by: Ard Biesheuvel --- arch/x86/platform/pvh/head.S | 7 ------- 1 file changed, 7 deletions(-) diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S index f09e0fb832e4..592747f2d731 100644 --- a/arch/x86/platform/pvh/head.S +++ b/arch/x86/platform/pvh/head.S @@ -179,13 +179,6 @@ SYM_CODE_START_LOCAL(pvh_start_xen) ANNOTATE_RETPOLINE_SAFE call *%rax - /* - * Clear phys_base. __startup_64 will *add* to its value, - * so reset to 0. - */ - xor %rbx, %rbx - movq %rbx, phys_base(%rip) - /* startup_64 expects boot_params in %rsi. */ lea pvh_bootparams(%rip), %rsi jmp startup_64 -- 2.46.0.792.g87dc391469-goog