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Message-ID: <20251117140007.122062-5-aneesh.kumar@kernel.org>
Date: Mon, 17 Nov 2025 19:30:00 +0530
From: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
To: linux-coco@...ts.linux.dev,
kvmarm@...ts.linux.dev
Cc: linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org,
dan.j.williams@...el.com,
aik@....com,
lukas@...ner.de,
Samuel Ortiz <sameo@...osinc.com>,
Xu Yilun <yilun.xu@...ux.intel.com>,
Jason Gunthorpe <jgg@...pe.ca>,
Suzuki K Poulose <Suzuki.Poulose@....com>,
Steven Price <steven.price@....com>,
Bjorn Helgaas <helgaas@...nel.org>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Catalin Marinas <catalin.marinas@....com>,
Marc Zyngier <maz@...nel.org>,
Will Deacon <will@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>,
"Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
Subject: [PATCH v2 04/11] coco: guest: arm64: Add support for updating interface reports from device
Support collecting interface reports using RSI calls. The fetched
interface report will be cached in the host.
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@...nel.org>
---
arch/arm64/include/asm/rhi.h | 1 +
drivers/virt/coco/arm-cca-guest/arm-cca.c | 6 ++++
drivers/virt/coco/arm-cca-guest/rhi-da.c | 44 +++++++++++++++++++++++
drivers/virt/coco/arm-cca-guest/rhi-da.h | 1 +
drivers/virt/coco/arm-cca-guest/rsi-da.c | 13 +++++++
drivers/virt/coco/arm-cca-guest/rsi-da.h | 2 ++
6 files changed, 67 insertions(+)
diff --git a/arch/arm64/include/asm/rhi.h b/arch/arm64/include/asm/rhi.h
index 335930bbf059..5f140015afc3 100644
--- a/arch/arm64/include/asm/rhi.h
+++ b/arch/arm64/include/asm/rhi.h
@@ -40,6 +40,7 @@
#define RHI_DA_FEATURES SMC_RHI_CALL(0x004B)
#define RHI_DA_VDEV_CONTINUE SMC_RHI_CALL(0x0051)
+#define RHI_DA_VDEV_GET_INTERFACE_REPORT SMC_RHI_CALL(0x0052)
#define RHI_DA_TDI_CONFIG_UNLOCKED 0x0
#define RHI_DA_TDI_CONFIG_LOCKED 0x1
diff --git a/drivers/virt/coco/arm-cca-guest/arm-cca.c b/drivers/virt/coco/arm-cca-guest/arm-cca.c
index f4c9e529c43e..7988ff6d4b2e 100644
--- a/drivers/virt/coco/arm-cca-guest/arm-cca.c
+++ b/drivers/virt/coco/arm-cca-guest/arm-cca.c
@@ -212,6 +212,12 @@ static struct pci_tsm *cca_tsm_lock(struct tsm_dev *tsm_dev, struct pci_dev *pde
if (ret)
return ERR_PTR(-EIO);
+ ret = cca_update_device_object_cache(pdev, cca_dsc);
+ if (ret) {
+ cca_device_unlock(pdev);
+ return ERR_PTR(-EIO);
+ }
+
return &no_free_ptr(cca_dsc)->pci.base_tsm;
}
diff --git a/drivers/virt/coco/arm-cca-guest/rhi-da.c b/drivers/virt/coco/arm-cca-guest/rhi-da.c
index 3430d8df4424..f4fb8577e1b5 100644
--- a/drivers/virt/coco/arm-cca-guest/rhi-da.c
+++ b/drivers/virt/coco/arm-cca-guest/rhi-da.c
@@ -156,3 +156,47 @@ int rhi_vdev_set_tdi_state(struct pci_dev *pdev, unsigned long target_state)
return ret;
}
+
+static inline int rhi_vdev_get_interface_report(unsigned long vdev_id,
+ unsigned long *cookie)
+{
+ unsigned long ret;
+
+ struct rsi_host_call *rhi_call __free(kfree) =
+ kmalloc(sizeof(struct rsi_host_call), GFP_KERNEL);
+ if (!rhi_call)
+ return -ENOMEM;
+
+ rhi_call->imm = 0;
+ rhi_call->gprs[0] = RHI_DA_VDEV_GET_INTERFACE_REPORT;
+ rhi_call->gprs[1] = vdev_id;
+
+ ret = rsi_host_call(virt_to_phys(rhi_call));
+ if (ret != RSI_SUCCESS)
+ return -EIO;
+
+ *cookie = rhi_call->gprs[1];
+ return map_rhi_da_error(rhi_call->gprs[0]);
+}
+
+int rhi_update_vdev_interface_report_cache(struct pci_dev *pdev)
+{
+ int ret;
+ unsigned long cookie;
+ int vdev_id = rsi_vdev_id(pdev);
+
+ for (;;) {
+ ret = rhi_vdev_get_interface_report(vdev_id, &cookie);
+ if (ret != -EBUSY)
+ break;
+ cond_resched();
+ }
+
+ while (ret == E_INCOMPLETE) {
+ if (should_abort_rhi_call_loop(vdev_id))
+ return -EINTR;
+ ret = rhi_vdev_continue(vdev_id, cookie);
+ }
+
+ return ret;
+}
diff --git a/drivers/virt/coco/arm-cca-guest/rhi-da.h b/drivers/virt/coco/arm-cca-guest/rhi-da.h
index 8dd77c7ed645..d83e61359b35 100644
--- a/drivers/virt/coco/arm-cca-guest/rhi-da.h
+++ b/drivers/virt/coco/arm-cca-guest/rhi-da.h
@@ -11,4 +11,5 @@
struct pci_dev;
bool rhi_has_da_support(void);
int rhi_vdev_set_tdi_state(struct pci_dev *pdev, unsigned long target_state);
+int rhi_update_vdev_interface_report_cache(struct pci_dev *pdev);
#endif
diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.c b/drivers/virt/coco/arm-cca-guest/rsi-da.c
index 6770861629f2..c8ba72e4be3e 100644
--- a/drivers/virt/coco/arm-cca-guest/rsi-da.c
+++ b/drivers/virt/coco/arm-cca-guest/rsi-da.c
@@ -34,3 +34,16 @@ int cca_device_unlock(struct pci_dev *pdev)
}
return 0;
}
+
+int cca_update_device_object_cache(struct pci_dev *pdev, struct cca_guest_dsc *dsc)
+{
+ int ret;
+
+ ret = rhi_update_vdev_interface_report_cache(pdev);
+ if (ret) {
+ pci_err(pdev, "failed to get interface report (%d)\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.h b/drivers/virt/coco/arm-cca-guest/rsi-da.h
index d1f4641a0fa1..fd4792a50daf 100644
--- a/drivers/virt/coco/arm-cca-guest/rsi-da.h
+++ b/drivers/virt/coco/arm-cca-guest/rsi-da.h
@@ -31,4 +31,6 @@ static inline int rsi_vdev_id(struct pci_dev *pdev)
int cca_device_lock(struct pci_dev *pdev);
int cca_device_unlock(struct pci_dev *pdev);
+int cca_update_device_object_cache(struct pci_dev *pdev, struct cca_guest_dsc *dsc);
+
#endif
--
2.43.0
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