Device assignment-related RHI calls result in a REC exit, which is
handled by the tsm guest_request callback.
Cc: Marc Zyngier <maz@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Alexey Kardashevskiy <aik@amd.com>
Cc: Samuel Ortiz <sameo@rivosinc.com>
Cc: Xu Yilun <yilun.xu@linux.intel.com>
Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
Cc: Steven Price <steven.price@arm.com>
Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
arch/arm64/include/asm/rhi.h | 4 ++
arch/arm64/include/uapi/asm/rmi-da.h | 19 +++++
drivers/virt/coco/arm-cca-host/arm-cca.c | 75 +++++++++++++++++++
drivers/virt/coco/arm-cca-host/rmi-da.c | 91 ++++++++++++++++++++++++
drivers/virt/coco/arm-cca-host/rmi-da.h | 4 ++
5 files changed, 193 insertions(+)
create mode 100644 arch/arm64/include/uapi/asm/rmi-da.h
diff --git a/arch/arm64/include/asm/rhi.h b/arch/arm64/include/asm/rhi.h
index 8f9ea4a4bb7c..3c84fedba4ab 100644
--- a/arch/arm64/include/asm/rhi.h
+++ b/arch/arm64/include/asm/rhi.h
@@ -79,4 +79,8 @@ enum rhi_tdi_state {
#define RHI_DA_VDEV_SET_TDI_STATE SMC_RHI_CALL(0x0054)
#define RHI_DA_VDEV_ABORT SMC_RHI_CALL(0x0056)
+/* guest request operation nr */
+#define __RHI_DA_OBJECT_SIZE 0x1
+#define __RHI_DA_OBJECT_READ 0x2
+
#endif
diff --git a/arch/arm64/include/uapi/asm/rmi-da.h b/arch/arm64/include/uapi/asm/rmi-da.h
new file mode 100644
index 000000000000..8743d9a2e5f7
--- /dev/null
+++ b/arch/arm64/include/uapi/asm/rmi-da.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+
+#ifndef _UAPI__ASM_RMI_DA_H
+#define _UAPI__ASM_RMI_DA_H
+
+#include <linux/types.h>
+
+struct arm64_vdev_object_size_guest_req {
+ __u32 req_type;
+ __u32 object_type;
+};
+
+struct arm64_vdev_object_read_guest_req {
+ __u32 req_type;
+ __u32 object_type;
+ __aligned_u64 offset;
+};
+
+#endif
diff --git a/drivers/virt/coco/arm-cca-host/arm-cca.c b/drivers/virt/coco/arm-cca-host/arm-cca.c
index 1c17269809a1..8678acd84d7d 100644
--- a/drivers/virt/coco/arm-cca-host/arm-cca.c
+++ b/drivers/virt/coco/arm-cca-host/arm-cca.c
@@ -13,6 +13,7 @@
#include <linux/cleanup.h>
#include <linux/kvm_host.h>
#include <linux/pci.h>
+#include <asm/rmi-da.h>
#include "rmi-da.h"
@@ -277,6 +278,79 @@ static void cca_tsm_unbind(struct pci_tdi *tdi)
kfree(host_tdi);
}
+static ssize_t cca_tsm_guest_req(struct pci_tdi *tdi, enum pci_tsm_req_scope scope,
+ sockptr_t req, size_t req_len,
+ sockptr_t resp, size_t resp_len,
+ u64 *tsm_code)
+{
+ struct pci_dev *pdev = tdi->pdev;
+
+ if (req.is_kernel || resp.is_kernel)
+ return -EINVAL;
+
+ switch (scope) {
+ case PCI_TSM_REQ_INFO: {
+ u32 req_type;
+
+ if (get_user(req_type, (u32 __user *)req.user))
+ return -EFAULT;
+
+ switch (req_type) {
+ case __RHI_DA_OBJECT_SIZE: {
+ int object_size;
+ struct arm64_vdev_object_size_guest_req req_obj;
+
+ if (req_len != sizeof(req_obj))
+ return -EINVAL;
+
+ if (copy_from_user((void *)&req_obj, req.user, req_len))
+ return -EFAULT;
+ object_size = cca_vdev_get_object_size(pdev, req_obj.object_type);
+ if (object_size > 0) {
+ if (resp_len < sizeof(object_size))
+ return -EINVAL;
+ if (copy_to_user(resp.user, &object_size, sizeof(object_size)))
+ return -EFAULT;
+
+ if (resp_len != sizeof(object_size))
+ return resp_len - sizeof(object_size);
+ return 0;
+ }
+ /* error */
+ return object_size;
+ }
+ case __RHI_DA_OBJECT_READ:
+ {
+ int len;
+ struct arm64_vdev_object_read_guest_req req_obj;
+
+ if (req_len != sizeof(req_obj))
+ return -EINVAL;
+
+ if (copy_from_user((void *)&req_obj, req.user, req_len))
+ return -EFAULT;
+
+ len = cca_vdev_read_cached_object(pdev,
+ req_obj.object_type,
+ req_obj.offset,
+ resp_len, resp.user);
+ if (len > 0) {
+ if (resp_len != len)
+ return resp_len - len;
+ return 0;
+ }
+ /* error */
+ return len;
+ }
+ default:
+ return -EINVAL;
+ }
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
static struct pci_tsm_ops cca_link_pci_ops = {
.probe = cca_tsm_pci_probe,
.remove = cca_tsm_pci_remove,
@@ -284,6 +358,7 @@ static struct pci_tsm_ops cca_link_pci_ops = {
.disconnect = cca_tsm_disconnect,
.bind = cca_tsm_bind,
.unbind = cca_tsm_unbind,
+ .guest_req = cca_tsm_guest_req,
};
static void cca_link_tsm_remove(void *tsm_dev)
diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.c b/drivers/virt/coco/arm-cca-host/rmi-da.c
index 2181430c47b5..fb623e5e5b62 100644
--- a/drivers/virt/coco/arm-cca-host/rmi-da.c
+++ b/drivers/virt/coco/arm-cca-host/rmi-da.c
@@ -12,6 +12,7 @@
#include <keys/asymmetric-type.h>
#include <keys/x509-parser.h>
#include <linux/kvm_types.h>
+#include <linux/kvm_host.h>
#include <asm/kvm_rmi.h>
#include "rmi-da.h"
@@ -837,3 +838,93 @@ void cca_vdev_unlock_and_destroy(struct realm *realm,
host_tdi->rmm_vdev = NULL;
host_tdi->realm = NULL;
}
+
+int cca_vdev_get_object_size(struct pci_dev *pdev, int type)
+{
+ long len;
+ struct pci_tsm *tsm = pdev->tsm;
+ struct cca_host_pf0_dsc *pf0_dsc;
+ struct cca_host_tdi *host_tdi;
+
+ if (!tsm)
+ return -EINVAL;
+
+ pf0_dsc = to_cca_pf0_dsc(tsm->dsm_dev);
+ host_tdi = to_cca_host_tdi(pdev);
+
+ guard(mutex)(&pf0_dsc->object_lock);
+ /* Determine the buffer that should be used */
+ if (type == RHI_DA_OBJECT_INTERFACE_REPORT) {
+ if (!host_tdi->interface_report)
+ return -EINVAL;
+ len = host_tdi->interface_report->offset;
+ } else if (type == RHI_DA_OBJECT_MEASUREMENT) {
+ if (!host_tdi->measurements)
+ return -EINVAL;
+ len = host_tdi->measurements->offset;
+ } else if (type == RHI_DA_OBJECT_CERTIFICATE) {
+ if (!pf0_dsc->cert_chain.cache)
+ return -EINVAL;
+ len = pf0_dsc->cert_chain.cache->offset;
+ } else if (type == RHI_DA_OBJECT_VCA) {
+ if (!pf0_dsc->vca)
+ return -EINVAL;
+ len = pf0_dsc->vca->offset;
+ } else {
+ return -EINVAL;
+ }
+
+ return len;
+}
+
+int cca_vdev_read_cached_object(struct pci_dev *pdev, int type,
+ unsigned long offset,
+ unsigned long max_len, void __user *user_buf)
+{
+ void *buf;
+ unsigned long len;
+ struct cca_host_pf0_dsc *pf0_dsc;
+ struct cca_host_tdi *host_tdi;
+ struct pci_tsm *tsm = pdev->tsm;
+
+ if (!tsm)
+ return -EINVAL;
+
+ pf0_dsc = to_cca_pf0_dsc(tsm->dsm_dev);
+ host_tdi = to_cca_host_tdi(pdev);
+
+ guard(mutex)(&pf0_dsc->object_lock);
+ /* Determine the buffer that should be used */
+ if (type == RHI_DA_OBJECT_INTERFACE_REPORT) {
+ if (!host_tdi->interface_report)
+ return -EINVAL;
+ len = host_tdi->interface_report->offset;
+ buf = host_tdi->interface_report->buf;
+ } else if (type == RHI_DA_OBJECT_MEASUREMENT) {
+ if (!host_tdi->measurements)
+ return -EINVAL;
+ len = host_tdi->measurements->offset;
+ buf = host_tdi->measurements->buf;
+ } else if (type == RHI_DA_OBJECT_CERTIFICATE) {
+ if (!pf0_dsc->cert_chain.cache)
+ return -EINVAL;
+ len = pf0_dsc->cert_chain.cache->offset;
+ buf = pf0_dsc->cert_chain.cache->buf;
+ } else if (type == RHI_DA_OBJECT_VCA) {
+ if (!pf0_dsc->vca)
+ return -EINVAL;
+ len = pf0_dsc->vca->offset;
+ buf = pf0_dsc->vca->buf;
+ } else {
+ return -EINVAL;
+ }
+
+ /* Assume that the buffer is large enough for the whole report */
+ if (max_len < len)
+ return -E2BIG;
+
+ if (copy_to_user(user_buf, buf + offset, len))
+ return -EIO;
+
+ return len;
+}
diff --git a/drivers/virt/coco/arm-cca-host/rmi-da.h b/drivers/virt/coco/arm-cca-host/rmi-da.h
index 9b0af1ac208f..9cc587393d02 100644
--- a/drivers/virt/coco/arm-cca-host/rmi-da.h
+++ b/drivers/virt/coco/arm-cca-host/rmi-da.h
@@ -11,6 +11,7 @@
#include <linux/pci-tsm.h>
#include <linux/sizes.h>
#include <asm/rmi_smc.h>
+#include <asm/rhi.h>
#define MAX_CACHE_OBJ_SIZE SZ_16M
#define CACHE_CHUNK_SIZE SZ_4K
@@ -143,4 +144,7 @@ void *cca_vdev_create(struct realm *realm, struct pci_dev *pdev,
struct pci_dev *pf0_dev, u32 guest_rid);
void cca_vdev_unlock_and_destroy(struct realm *realm, struct pci_dev *pdev,
struct pci_dev *pf0_dev);
+int cca_vdev_get_object_size(struct pci_dev *pdev, int type);
+int cca_vdev_read_cached_object(struct pci_dev *pdev, int type, unsigned long offset,
+ unsigned long max_len, void __user *user_buf);
#endif
--
2.43.0