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d=google.com; s=20230601; t=1734026744; x=1734631544; darn=lists.infradead.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=JE/i5lAaPb/dJbCdJrBXAH1qN4sLI6tJdn5DSSo5Z6Q=; b=2SciMooZw9zv7tG8HxAzvfT26zMPGhoEnLDiwqWsc2DuCgDw/7dQRCBehGnRAQXzDB QRpl/wO58GTbjScF/XYtkOLkYI7OatClHEm3pN3vhV5mOiqEjvXBZ7Wz5dTH5c5oXG0e nhVcN+b7AriAcRJmjcjf4tbXQSpErwpDb1DBOpZKnoj/J8/uXPI6I0z0d91Z4bu4xQr2 fJ6mM4p8+xxgb9LVwV1MHrKfIo/lO5Kqgo9Yu6NhWvqn2EUkTqbR3GcsShNb2KAJlCsk 6QSrfHqhG9/ebTo3ONCGCCoPmz71GVnvJhoH227O8MLupnc+Hc2UE/iUb5klZV+Pohi1 lKNQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734026744; x=1734631544; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=JE/i5lAaPb/dJbCdJrBXAH1qN4sLI6tJdn5DSSo5Z6Q=; b=m4hFBijXOaaMqBaZVsxtMFreqs4XS7BAA6B2Esr1gP2ybfMYWq3kwnuPfH957twiKf x9YYeqSAo9/cZZe3aQj5MVS0nde/iy/Hiz0geZNGrIZlYx40zCGSb4fHOP1L5lzccykN o01aVNhKSCtmVYIffzL0KsK1IqMKJUQ/o3P3O7p8lWAInjxwvxfHM6kFsnwB+5uS6iup m4mYtfOeWNAK1ePwUAh+auemWHcqQrLCKN9e2jg6ybbkQgj1YWFdYHVoe9Tuu1DiQ9Sf tBNBMyg1AZrpGMQBOggC+7YDn2sonoLw272AO/cNCUx+CsV8UwzD2r9hMF9OSzGzb7Bq 2+1A== X-Forwarded-Encrypted: i=1; AJvYcCXURmdckKjgL5Dbu48nv/zxHkLSsxPXMcerYUeM/+CRjDhdBMX39O3dNpbdsqg+W1CnZr6DGGXH57Hg5ayPkHtf@lists.infradead.org X-Gm-Message-State: AOJu0YxC40yGDAUy5+3ukoNYeTqfEKbkk9xzZnaBYC1bJMWMZGf++Lhu B/NiGhenZOMTEgWsY1ZIunjTbJN75nRnrgGDGTLChfeLFkujJ0jzHQ2iIO8dlwApJt12t4j3mjI s51zEC8IYbA== X-Google-Smtp-Source: AGHT+IFLzVaDnxOQQpqmcBPGMzPT4gfF0J87Ucqw5+xEyz4q3jDg+AjzzwnSPOPsWSAVi+g32NOxN+jbO3aNIw== X-Received: from wmbd18.prod.google.com ([2002:a05:600c:58d2:b0:434:a98d:6a1c]) (user=smostafa job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:5029:b0:431:44fe:fd9a with SMTP id 5b1f17b1804b1-4361c3e010amr64441725e9.19.1734026744100; Thu, 12 Dec 2024 10:05:44 -0800 (PST) Date: Thu, 12 Dec 2024 18:03:53 +0000 In-Reply-To: <20241212180423.1578358-1-smostafa@google.com> Mime-Version: 1.0 References: <20241212180423.1578358-1-smostafa@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241212180423.1578358-30-smostafa@google.com> Subject: [RFC PATCH v2 29/58] KVM: arm64: smmu-v3: Setup event queue From: Mostafa Saleh To: iommu@lists.linux.dev, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com, will@kernel.org, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, robdclark@gmail.com, joro@8bytes.org, robin.murphy@arm.com, jean-philippe@linaro.org, jgg@ziepe.ca, nicolinc@nvidia.com, vdonnefort@google.com, qperret@google.com, tabba@google.com, danielmentz@google.com, tzukui@google.com, Mostafa Saleh X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241212_100546_022739_07336CA4 X-CRM114-Status: GOOD ( 16.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The host can use the event queue for debuging, and unlike the command queue, it would be managed by the kernel. However, it must set in a shared state so it can't be donated to the hypervisor later. This relies on the ARM_SMMU_EVTQ_BASE can't be changed after de-privilege. Signed-off-by: Mostafa Saleh --- arch/arm64/kvm/hyp/nvhe/iommu/arm-smmu-v3.c | 39 +++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/iommu/arm-smmu-v3.c b/arch/arm64/kvm/hyp/nvhe/iommu/arm-smmu-v3.c index 43d2ce7828c1..5020f74421ad 100644 --- a/arch/arm64/kvm/hyp/nvhe/iommu/arm-smmu-v3.c +++ b/arch/arm64/kvm/hyp/nvhe/iommu/arm-smmu-v3.c @@ -342,6 +342,41 @@ static int smmu_init_cmdq(struct hyp_arm_smmu_v3_device *smmu) return 0; } +/* + * Event q support is optional and managed by the kernel, + * However, it must set in a shared state so it can't be donated + * to the hypervisor later. + * This relies on the ARM_SMMU_EVTQ_BASE can't be changed after + * de-privilege. + */ +static int smmu_init_evtq(struct hyp_arm_smmu_v3_device *smmu) +{ + u64 evtq_base, evtq_pfn; + size_t evtq_nr_entries, evtq_size, evtq_nr_pages; + size_t i; + int ret; + + evtq_base = readq_relaxed(smmu->base + ARM_SMMU_EVTQ_BASE); + if (!evtq_base) + return 0; + + if (evtq_base & ~(Q_BASE_RWA | Q_BASE_ADDR_MASK | Q_BASE_LOG2SIZE)) + return -EINVAL; + + evtq_nr_entries = 1 << (evtq_base & Q_BASE_LOG2SIZE); + evtq_size = evtq_nr_entries * EVTQ_ENT_DWORDS * 8; + evtq_nr_pages = PAGE_ALIGN(evtq_size) >> PAGE_SHIFT; + + evtq_pfn = PAGE_ALIGN(evtq_base & Q_BASE_ADDR_MASK) >> PAGE_SHIFT; + + for (i = 0 ; i < evtq_nr_pages ; ++i) { + ret = __pkvm_host_share_hyp(evtq_pfn + i); + if (ret) + return ret; + } + return 0; +} + static int smmu_init_strtab(struct hyp_arm_smmu_v3_device *smmu) { int ret; @@ -429,6 +464,10 @@ static int smmu_init_device(struct hyp_arm_smmu_v3_device *smmu) if (ret) return ret; + ret = smmu_init_evtq(smmu); + if (ret) + return ret; + ret = smmu_init_strtab(smmu); if (ret) return ret;