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[37.24.206.209]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a5a17b0172fsm693066766b.183.2024.05.14.01.20.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 May 2024 01:20:23 -0700 (PDT) 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: d007297b-11ca-11ef-909d-e314d9c70b13 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1715674824; x=1716279624; darn=lists.xenproject.org; h=content-transfer-encoding:in-reply-to:autocrypt:from:references:cc :to:content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=9Zgh8G1aqBfIdEFiPl2LajYHgmz7y437ztgTEUef/IM=; b=daquiFQaPGlx+VN8xoiSUI8Sz7yjl43ZVCh3XqCIzU9nHEBPQn4QG4dP1r0md9yQpm sQUHZKliCNipt8pUAxU0/dCL3hhxk+x9+c1P0UP5KnSiAKuIvbiSXOyLOvsxbNv/9OSE tQDhplck/hqPLh8H7afyu94JLdiY3Qfz/9Wfq8bo0OGo3xwJOkq9BGbPpJ8qUPYy9mwb Bx3U71SRzYRsBXsjbEnqn/qw1TVBD+PU0NfBAfiMMI2vRrLXp8/A18QpzVuJEB78ho5d ivYGyJqezYlu6IBvRl0j6BuoruhVqDWkxZu8cDwOzApqLWpIsBfuLGl960tlpzyrdk1T ZGmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1715674824; x=1716279624; h=content-transfer-encoding:in-reply-to:autocrypt:from:references:cc :to:content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=9Zgh8G1aqBfIdEFiPl2LajYHgmz7y437ztgTEUef/IM=; b=GGDbddsK+v10MPnqeqtvUJPzGI+s9/dAYVCnMvajxRt/AR7rLeh8rGpwdRbrcxuk3o /+4VygNj6pCmF1z90Lu/3m0bzNXWT2deMJ3UpYXfP5onzygZUCqsH4dmBP88JvvsW+ZY wFzDTklwMczH5NVTgNSoPn1PAUuQwFM1embKR41ZZNTpAiA+46iLuY/GYmDUQxm/TKRN GCpUhSnR3Rs7MTX/7yBquEEug9Zrss7oj1mGysEk1nvpRLm1UViylUHFr+5IcDdzM0jv 9JDPXOzwAXio2ZsdMDCECpz4oQtNo2DzVrW9iahIMq4h5mv/A6c0lU6qzZBaQxJnRQIf faVQ== X-Gm-Message-State: AOJu0YxMaS1fJMzXGkWrlm96AYiRwF6u+8S49l5LpGapf5e6j43CxmSB WGvZ/Q5p03Ns5hclD3LkDO25I4JwtEl4uR0iiXlB0TqGgwlzqOKyfL945G1DdA== X-Google-Smtp-Source: AGHT+IGEHAN1vsFQid7mIRKMTBlXUy5mOBAdf4XSnOrKUDI4Jj4zpPMB0W3XhUGZjzGjbDwQb2a8jA== X-Received: by 2002:a05:6512:33c5:b0:522:2a2c:759e with SMTP id 2adb3069b0e04-5222a2c76c2mr8441709e87.6.1715674823897; Tue, 14 May 2024 01:20:23 -0700 (PDT) Message-ID: <0b95b04d-22c1-4ec9-8d3e-a4974e7610bc@suse.com> Date: Tue, 14 May 2024 10:20:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Serious AMD-Vi(?) issue Content-Language: en-US To: =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= Cc: xen-devel@lists.xenproject.org, Andrew Cooper , Wei Liu , Kelly Choi , Elliott Mitchell References: <2aa4d1f4-ff37-4f12-bfbb-3ef5ad3f6fdd@suse.com> From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 13.05.2024 10:44, Roger Pau Monné wrote: > On Fri, May 10, 2024 at 09:09:54PM -0700, Elliott Mitchell wrote: >> On Thu, Apr 18, 2024 at 09:33:31PM -0700, Elliott Mitchell wrote: >>> >>> I suspect this is a case of there is some step which is missing from >>> Xen's IOMMU handling. Perhaps something which Linux does during an early >>> DMA setup stage, but the current Xen implementation does lazily? >>> Alternatively some flag setting or missing step? >>> >>> I should be able to do another test approach in a few weeks, but I would >>> love if something could be found sooner. >> >> Turned out to be disturbingly easy to get the first entry when it >> happened. Didn't even need `dbench`, it simply showed once the OS was >> fully loaded. I did get some additional data points. >> >> Appears this requires an AMD IOMMUv2. A test system with known >> functioning AMD IOMMUv1 didn't display the issue at all. >> >> (XEN) AMD-Vi: IO_PAGE_FAULT: DDDD:bb:dd.f d0 addr fffffffdf8000000 flags 0x8 I > > I would expect the address field to contain more information about the > fault, but I'm not finding any information on the AMD-Vi specification > apart from that it contains the DVA, which makes no sense when the > fault is caused by an interrupt. Isn't the address above in the "magic" HT range (and hence still meaningful as an address)? Jan