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([2001:b07:6468:f312:5e2c:eb9a:a8b6:fd3e]) by smtp.gmail.com with ESMTPSA id b1sm5732062ejz.24.2021.08.09.02.03.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Aug 2021 02:03:23 -0700 (PDT) Subject: Re: [PATCH] selftests: KVM: avoid failures due to reserved HyperTransport region To: Joao Martins Cc: stable@vger.kernel.org, David Matlack , Maxim Levitsky , linux-kernel@vger.kernel.org, kvm@vger.kernel.org References: <20210805105423.412878-1-pbonzini@redhat.com> <4b530fb6-81cc-be36-aa68-92ec01c65775@oracle.com> From: Paolo Bonzini Message-ID: <5f3c13be-f65d-1793-bd91-7491d3e149b0@redhat.com> Date: Mon, 9 Aug 2021 11:03:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <4b530fb6-81cc-be36-aa68-92ec01c65775@oracle.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/08/21 12:57, Joao Martins wrote: > Base Address Top Address Use > > FD_0000_0000h FD_F7FF_FFFFh Reserved interrupt address space > FD_F800_0000h FD_F8FF_FFFFh Interrupt/EOI IntCtl > FD_F900_0000h FD_F90F_FFFFh Legacy PIC IACK > FD_F910_0000h FD_F91F_FFFFh System Management > FD_F920_0000h FD_FAFF_FFFFh Reserved Page Tables > FD_FB00_0000h FD_FBFF_FFFFh Address Translation > FD_FC00_0000h FD_FDFF_FFFFh I/O Space > FD_FE00_0000h FD_FFFF_FFFFh Configuration > FE_0000_0000h FE_1FFF_FFFFh Extended Configuration/Device Messages > FE_2000_0000h FF_FFFF_FFFFh Reserved The problems we're seeing are with FFFD_0000_0000h. How does the IOMMU interpret bits 40-47 of the address? Paolo