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[92.22.57.86]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4255d8a6bbesm9616571f8f.12.2025.10.03.15.53.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Oct 2025 15:53:43 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: d0a1cdb9-a0ab-11f0-9809-7dc792cee155 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.com; s=google; t=1759532024; x=1760136824; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=xJgRuOTIVNW6wDEOmf6Heo5+NbgUqsHIo8qCR4ngeB0=; b=wRhTZlM3Khw5QSGAtaOj564mhrybBqWxRoBuomu8ZfDoCf8XUEAF30So7QWCgUJVKR gQJoJ6SnDE0LFlW7lexfj/OXeLDh7ECqYEslh877VIQBP5+hyvSmRAFG/WJKJPmTkBj1 LltyfUdf2dXgzIqbAU+dRRIBJ5k9QtJHfk/hI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759532024; x=1760136824; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=xJgRuOTIVNW6wDEOmf6Heo5+NbgUqsHIo8qCR4ngeB0=; b=YM3vxxhwEAnzTyQxyfKypVhXu/ctkjpD4VaCf8M1JF8JMrWwDVn1jCFDGTWxvfHC7u Z+piR/A5P4xK7IJfgTfPQfxTOZlOXGuFPvdd7Tn/iwkBVqjFrKZcHqGkRzNGF0nrMwBa zY2ofXxJby/UARv36KU44AkHX/ySXU4B+ODGr0/r89ToMnqnQFjwdI4eIHhEMjSGti5x NgwDxl77z1HhlwXYgrQJx2sORfDuGuVXDOOoBIejkiSX4tKp9SqMf9Mj3KvvVIf5znu+ sxEOWNq0itbkodHOenyl8sONXWIUclhTuoU8cDMDLpdZLKSbZ/rgXxB2JlT0BsS4PPNY Xqmg== X-Gm-Message-State: AOJu0Ywdh03kxsDhZlcxJ+a7ye7AfWShbpbQeMS5BCdzKXQ4cHTkoF0W W3LBo+4RfG2n06kufDX5qMIvqYeCqj69zt32WPSC0yErMDosNHOx//QWE5iyIJvkp5t6xYc0hVO YfrYFlUh3Rw== X-Gm-Gg: ASbGncsvqlzylsBT2taeOtbnUdkg07mRvte0ygfEe6aRP1TRQO07FfIfNmHMDNI+RV9 UtsLlN7ONe4Rz2ehgsWz4DByKUZzeAIuM0Ia1zZkUXy0pYGasH5YXW3NIBulA9rehmbbEl9KxUb 0wFPoPOV/vP8rn0gX8dXiBq/5hj2erfSOZJaXBmAQFUxpH9bGIUg+HIKHkpB3O0ejNKjyNzJJ3p b3wrGreAR/2vWe3Zx0M81/noH6ClIeIq3AG/Y3A8p1XxP2DMhtEkaIW9UfFoZup/+W6EtW9j7Pb vR5CHBGCxv+NcNdZUekl1dhMuiCleQru9lazkEvLyukONYr6btrLMoAc6IeKrcujWz4O9IvLp23 v3B9bwscNncLuragn5cQpyAimGYj/gr3C+Tw0N3pr+q5VYxBdCSjv0FTo7JpGQb5kKYAA8b8C4g 92WMZ/pjn0N2GzX/oh25CkqgrtBXVv/ts= X-Google-Smtp-Source: AGHT+IFqTQEWOz7mRrwudCzSnWkTI1QqUVdMs3PrrnKfBiD2fX3apMHX8+ej9IICiqFHzvdmEAGjQQ== X-Received: by 2002:a05:6000:2386:b0:3ee:1357:e191 with SMTP id ffacd0b85a97d-425671a92f2mr2275302f8f.30.1759532024160; Fri, 03 Oct 2025 15:53:44 -0700 (PDT) From: Andrew Cooper To: Xen-devel Cc: Andrew Cooper , Jan Beulich , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= Subject: [PATCH v3 03/22] x86/fsgsbase: Split out __{rd,wr}gs_shadow() helpers Date: Fri, 3 Oct 2025 23:53:15 +0100 Message-Id: <20251003225334.2123667-4-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20251003225334.2123667-1-andrew.cooper3@citrix.com> References: <20251003225334.2123667-1-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: 1759532062702116600 Right now they're inline in {read,write}_gs_shadow(), but we're going to ne= ed to use these elsewhere to support FRED. No functional change. Signed-off-by: Andrew Cooper --- CC: Jan Beulich CC: Roger Pau Monn=C3=A9 v3: * Rename to __{rd,wr}gs_shadow() --- xen/arch/x86/include/asm/fsgsbase.h | 36 ++++++++++++++++++----------- 1 file changed, 23 insertions(+), 13 deletions(-) diff --git a/xen/arch/x86/include/asm/fsgsbase.h b/xen/arch/x86/include/asm= /fsgsbase.h index 03e6a85d31ce..557703842691 100644 --- a/xen/arch/x86/include/asm/fsgsbase.h +++ b/xen/arch/x86/include/asm/fsgsbase.h @@ -32,6 +32,17 @@ static inline unsigned long __rdgsbase(void) return base; } =20 +static inline unsigned long __rdgs_shadow(void) +{ + unsigned long base; + + asm_inline volatile ( "swapgs\n\t" + "rdgsbase %0\n\t" + "swapgs" : "=3Dr" (base) ); + + return base; +} + static inline void __wrfsbase(unsigned long base) { asm volatile ( "wrfsbase %0" :: "r" (base) ); @@ -42,6 +53,14 @@ static inline void __wrgsbase(unsigned long base) asm volatile ( "wrgsbase %0" :: "r" (base) ); } =20 +static inline void __wrgs_shadow(unsigned long base) +{ + asm_inline volatile ( "swapgs\n\t" + "wrgsbase %0\n\t" + "swapgs" + :: "r" (base) ); +} + static inline unsigned long read_fs_base(void) { unsigned long base; @@ -71,13 +90,9 @@ static inline unsigned long read_gs_shadow(void) unsigned long base; =20 if ( read_cr4() & X86_CR4_FSGSBASE ) - { - asm volatile ( "swapgs" ); - base =3D __rdgsbase(); - asm volatile ( "swapgs" ); - } - else - rdmsrl(MSR_SHADOW_GS_BASE, base); + return __rdgs_shadow(); + + rdmsrl(MSR_SHADOW_GS_BASE, base); =20 return base; } @@ -101,12 +116,7 @@ static inline void write_gs_base(unsigned long base) static inline void write_gs_shadow(unsigned long base) { if ( read_cr4() & X86_CR4_FSGSBASE ) - { - asm volatile ( "swapgs\n\t" - "wrgsbase %0\n\t" - "swapgs" - :: "r" (base) ); - } + __wrgs_shadow(base); else wrmsrl(MSR_SHADOW_GS_BASE, base); } --=20 2.39.5