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Thu, 03 Jun 2021 07:48:48 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-454-oDx5cUpLN-Ke9lP9xY6Uvw-1; Thu, 03 Jun 2021 07:48:43 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 1935E6A2B2 for ; Thu, 3 Jun 2021 11:48:43 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.194.97]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6E8F319704; Thu, 3 Jun 2021 11:48:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1622720925; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3QCY58JX8hnn40e/d2Qq11GOt2O++6pCaxA+8FKsrUs=; b=Siaad9xbBdKLGgCBxyv1wlIFyobE6r8q5fCUkR8NyEDj5Nny8Av0DX1p/YY1avVbs6Z8N2 6nfB8clr7//ZqH9AEoostNp7RktizuUymfZejgabnjK1AydyVFIL7p2fqEoPbJq+AX2rvJ bRbRDBkNWo1wED3dHJ7lo/h9PPXGt30= X-MC-Unique: oDx5cUpLN-Ke9lP9xY6Uvw-1 From: Vitaly Kuznetsov To: qemu-devel@nongnu.org, Eduardo Habkost Subject: [PATCH v7 2/9] i386: clarify 'hv-passthrough' behavior Date: Thu, 3 Jun 2021 13:48:28 +0200 Message-Id: <20210603114835.847451-3-vkuznets@redhat.com> In-Reply-To: <20210603114835.847451-1-vkuznets@redhat.com> References: <20210603114835.847451-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vkuznets@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=vkuznets@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.37, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Marcelo Tosatti , Igor Mammedov Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" Clarify the fact that 'hv-passthrough' only enables features which are already known to QEMU and that it overrides all other 'hv-*' settings. Signed-off-by: Vitaly Kuznetsov Reviewed-by: Eduardo Habkost --- docs/hyperv.txt | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/docs/hyperv.txt b/docs/hyperv.txt index e53c581f4586..a51953daa833 100644 --- a/docs/hyperv.txt +++ b/docs/hyperv.txt @@ -209,8 +209,11 @@ In some cases (e.g. during development) it may make se= nse to use QEMU in 'pass-through' mode and give Windows guests all enlightenments currently supported by KVM. This pass-through mode is enabled by "hv-passthrough" CPU flag. -Note: enabling this flag effectively prevents migration as supported featu= res -may differ between target and destination. +Note: "hv-passthrough" flag only enables enlightenments which are known to= QEMU +(have corresponding "hv-*" flag) and copies "hv-spinlocks=3D"/"hv-vendor-i= d=3D" +values from KVM to QEMU. "hv-passthrough" overrides all other "hv-*" setti= ngs on +the command line. Also, enabling this flag effectively prevents migration = as the +list of enabled enlightenments may differ between target and destination h= osts. =20 =20 4. Useful links --=20 2.31.1