From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f42.google.com (mail-ed1-f42.google.com [209.85.208.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 02D098286A for ; Mon, 10 Jun 2024 10:21:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718014903; cv=none; b=e9IUVH3Cw/ktzyfGFkF6ftq0D9P3nAfK9PKZoVJHj+0HK93NYkfbUb9rHywBgkcA4vhRiFyL5OIfpuneYooT37eZlzjjgadWdyGGviOMVbLB7DpZTgBGFmeuHUIVxFa5xNW0bC37YoofWV1egkd5K2aVnrEexIZEihkUrE493h8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718014903; c=relaxed/simple; bh=n/Kr224Se4bnUgaKv7FxbMglodNlFAhVuU9INti7pAw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nls+rx2oMkacrsRyWYUFOFow8Mcev7+KFnH3izpDRiLtqUE3mHueOfsP+/GzWQn83qxi/GSp+L3djXGSeLE4jgt/Keo72oc8AK6Y8kLsC9+boqcD4aQbhPPNZdWBkLFeEAHqBgX2I8BpgCgC1UeXuaXHon3PUoBCLPKdTS96M1w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Ppu4h3mW; arc=none smtp.client-ip=209.85.208.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Ppu4h3mW" Received: by mail-ed1-f42.google.com with SMTP id 4fb4d7f45d1cf-57c61165af6so2829603a12.2 for ; Mon, 10 Jun 2024 03:21:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1718014900; x=1718619700; darn=lists.linux.dev; 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=1h9f1jusJiCVXI0HUFRIPuyM0FJ2eMb2RD0DEq0ZSug=; b=Ppu4h3mW0CNDHNhJSkZ2Neqr2cSDZn+gJDqiXt6oyyOiefOAu0gduhWW4cQ7U+0V3Z akJhVOWz3HRnjSQQGMnmeAJyRk8E56zn8XRzQlUxaSJxT2FAgObCRInOGqVK9jsdWIqD ic51/FqpWECD1crAUOasQKdAVjU7UC2lI/XeMiFtfbVObouapnaSPJljFnF0DPDrEe7D oq3XIxj2r8pYJVrjBTR/mg2D5O8ahjYy9Dlnw69pwCGcJT8L2ZV8GMyXpM2XK/C9iEHc 1x5re0W1sxL8jgTey2IaJvdsjCKWbbkmnB/ltWvU6oZT6Bag7x1F2TBWc4onI82S0QA7 wwSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718014900; x=1718619700; 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=1h9f1jusJiCVXI0HUFRIPuyM0FJ2eMb2RD0DEq0ZSug=; b=tyYO1J7Up/1RtfTZqDVJRl/D4T9TArFiwbHKU9INfTLnGvVnhbbUWzU8K/UwNbVKco F8bS8Ed/idx3+eZs+DLtTR2j6SuoNwBJr4xYT7dsWGzt93bRw6hiQVexINcQ95OBtcf/ +pdISQsDJQGKRv/KXfHHtPYQvsh7+M2dis4keR6dOY3GOQ6oPI/x/8P60K1kdNlOuy7P PZMlAlJG9kevU/7eJ9ZM2bOCEN4hCoHYOD5yP49/ZjZzf1gb0XL+RhpA/ihAxNT8xHLe PiyHYqxnhXntFvl2TP5rn71IRnDmXuWjIsdvMDblX+mzHM3Muh9JpJspzoNejANIDTJd 8xAg== X-Forwarded-Encrypted: i=1; AJvYcCVXCmEtMSwOWjEW7FuQJ1GbdzV4UB6JKMfFuUTjnh7DHbcuNro6MxPHuHUkaT2sxPgEvk0LsY+1Zi7MCATvLjM4Q+Q2X2N/DvdGhg== X-Gm-Message-State: AOJu0YyLsjgQWi8KBQnP+z2qhwC5qcjMG1t2aY/E09uAXXvq8XerA3pK rOMseuQcjt76ovsbofi7CWNUhPkstINuxU4GY2mH46qWiKSqnEUT X-Google-Smtp-Source: AGHT+IFJiw9+hjS8AaCE8xUhReVnHEw0PrrFH9cPzv9TZmB9phDv2ggpsMiBf14CXAFGLO+4Z9OVRQ== X-Received: by 2002:a17:906:fe07:b0:a6d:b66f:7b21 with SMTP id a640c23a62f3a-a6db66f7e7emr709355566b.54.1718014899942; Mon, 10 Jun 2024 03:21:39 -0700 (PDT) Received: from vasant-suse.fritz.box ([2001:9e8:ab68:af00:6f43:17ee:43bd:e0a9]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a6f0d7b35d5sm290887766b.192.2024.06.10.03.21.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Jun 2024 03:21:39 -0700 (PDT) From: vsntk18@gmail.com To: vsntk18@gmail.com Cc: x86@kernel.org, Borislav.Petkov@amd.com, Dhaval.Giani@amd.com, ashish.kalra@amd.com, cfir@google.com, dan.j.williams@intel.com, dave.hansen@linux.intel.com, ebiederm@xmission.com, erdemaktas@google.com, hpa@zytor.com, jgross@suse.com, jroedel@suse.de, jslaby@suse.cz, keescook@chromium.org, kexec@lists.infradead.org, kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, luto@kernel.org, martin.b.radev@gmail.com, mhiramat@kernel.org, michael.roth@amd.com, mstunes@vmware.com, nivedita@alum.mit.edu, peterz@infradead.org, rientjes@google.com, seanjc@google.com, stable@vger.kernel.org, thomas.lendacky@amd.com, virtualization@lists.linux-foundation.org, vkarasulli@suse.de Subject: [PATCH v6 08/10] x86/sev: Handle CLFLUSH MMIO events Date: Mon, 10 Jun 2024 12:21:11 +0200 Message-Id: <20240610102113.20969-9-vsntk18@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240610102113.20969-1-vsntk18@gmail.com> References: <20240610102113.20969-1-vsntk18@gmail.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Joerg Roedel Handle CLFLUSH instruction to MMIO memory in the #VC handler. The instruction is ignored by the handler, as the Hypervisor is responsible for cache management of emulated MMIO memory. Signed-off-by: Joerg Roedel Signed-off-by: Vasant Karasulli --- arch/x86/include/asm/insn-eval.h | 1 + arch/x86/kernel/sev-shared.c | 3 +++ arch/x86/lib/insn-eval-shared.c | 7 +++++++ 3 files changed, 11 insertions(+) diff --git a/arch/x86/include/asm/insn-eval.h b/arch/x86/include/asm/insn-eval.h index 54368a43abf6..3bcea641913a 100644 --- a/arch/x86/include/asm/insn-eval.h +++ b/arch/x86/include/asm/insn-eval.h @@ -40,6 +40,7 @@ enum insn_mmio_type { INSN_MMIO_READ_ZERO_EXTEND, INSN_MMIO_READ_SIGN_EXTEND, INSN_MMIO_MOVS, + INSN_MMIO_IGNORE, }; enum insn_mmio_type insn_decode_mmio(struct insn *insn, int *bytes); diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index 1b25a6cacec7..2a963ad84f10 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -1171,6 +1171,9 @@ static enum es_result vc_handle_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt) if (mmio == INSN_MMIO_DECODE_FAILED) return ES_DECODE_FAILED; + if (mmio == INSN_MMIO_IGNORE) + return ES_OK; + if (mmio != INSN_MMIO_WRITE_IMM && mmio != INSN_MMIO_MOVS) { reg_data = insn_get_modrm_reg_ptr(insn, ctxt->regs); if (!reg_data) diff --git a/arch/x86/lib/insn-eval-shared.c b/arch/x86/lib/insn-eval-shared.c index 02acdc2921ff..27fd347d84ae 100644 --- a/arch/x86/lib/insn-eval-shared.c +++ b/arch/x86/lib/insn-eval-shared.c @@ -906,6 +906,13 @@ enum insn_mmio_type insn_decode_mmio(struct insn *insn, int *bytes) *bytes = 2; type = INSN_MMIO_READ_SIGN_EXTEND; break; + case 0xae: /* CLFLUSH */ + /* + * Ignore CLFLUSHes - those go to emulated MMIO anyway and the + * hypervisor is responsible for cache management. + */ + type = INSN_MMIO_IGNORE; + break; } break; } -- 2.34.1