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[90.33.190.31]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429c1142c3csm3748530f8f.16.2025.10.31.07.03.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 31 Oct 2025 07:03:51 -0700 (PDT) Message-ID: Date: Fri, 31 Oct 2025 15:03:50 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] hw/arm/imx8mp-evk: Fix guest time in KVM mode Content-Language: en-US To: Bernhard Beschow , qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Paolo Bonzini , Peter Maydell References: <20251029142311.2986-1-shentey@gmail.com> <20251029142311.2986-3-shentey@gmail.com> From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20251029142311.2986-3-shentey@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::334; envelope-from=philmd@linaro.org; helo=mail-wm1-x334.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 29/10/25 15:23, Bernhard Beschow wrote: > The imx8mp DTB hardcodes the clock frequency of the system counter to 8MHz. > In KVM mode, the host CPU is used whose system counter runs at a different > frequency, resulting in the guest clock running slower or faster. Fix this > by not hardcoding the clock frequency which makes the Linux driver read > the real clock frequency from the register. > > Signed-off-by: Bernhard Beschow > --- > hw/arm/imx8mp-evk.c | 9 +++++++++ > 1 file changed, 9 insertions(+) Reviewed-by: Philippe Mathieu-Daudé