diff mbox series

[v14,15/25] virt: gunyah: Add Qualcomm Gunyah platform ops

Message ID 20230613172054.3959700-16-quic_eberman@quicinc.com
State New
Headers show
Series Drivers for Gunyah hypervisor | expand

Commit Message

Elliot Berman June 13, 2023, 5:20 p.m. UTC
Qualcomm platforms have a firmware entity which performs access control
to physical pages. Dynamically started Gunyah virtual machines use the
QCOM_SCM_RM_MANAGED_VMID for access. Linux thus needs to assign access
to the memory used by guest VMs. Gunyah doesn't do this operation for us
since it is the current VM (typically VMID_HLOS) delegating the access
and not Gunyah itself. Use the Gunyah platform ops to achieve this so
that only Qualcomm platforms attempt to make the needed SCM calls.

Reviewed-by: Alex Elder <elder@linaro.org>
Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
---
 drivers/virt/gunyah/Kconfig       |  13 +++
 drivers/virt/gunyah/Makefile      |   1 +
 drivers/virt/gunyah/gunyah_qcom.c | 153 ++++++++++++++++++++++++++++++
 3 files changed, 167 insertions(+)
 create mode 100644 drivers/virt/gunyah/gunyah_qcom.c

Comments

Bjorn Andersson Aug. 5, 2023, 6:11 p.m. UTC | #1
On Tue, Jun 13, 2023 at 10:20:43AM -0700, Elliot Berman wrote:
> Qualcomm platforms have a firmware entity which performs access control
> to physical pages. Dynamically started Gunyah virtual machines use the
> QCOM_SCM_RM_MANAGED_VMID for access. Linux thus needs to assign access
> to the memory used by guest VMs. Gunyah doesn't do this operation for us
> since it is the current VM (typically VMID_HLOS) delegating the access
> and not Gunyah itself. Use the Gunyah platform ops to achieve this so
> that only Qualcomm platforms attempt to make the needed SCM calls.
> 
> Reviewed-by: Alex Elder <elder@linaro.org>
> Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
> Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
> ---
>  drivers/virt/gunyah/Kconfig       |  13 +++
>  drivers/virt/gunyah/Makefile      |   1 +
>  drivers/virt/gunyah/gunyah_qcom.c | 153 ++++++++++++++++++++++++++++++
>  3 files changed, 167 insertions(+)
>  create mode 100644 drivers/virt/gunyah/gunyah_qcom.c
> 
> diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig
> index de815189dab6c..0421b751aad4f 100644
> --- a/drivers/virt/gunyah/Kconfig
> +++ b/drivers/virt/gunyah/Kconfig
> @@ -5,6 +5,7 @@ config GUNYAH
>  	depends on ARM64
>  	depends on MAILBOX
>  	select GUNYAH_PLATFORM_HOOKS
> +	imply GUNYAH_QCOM_PLATFORM if ARCH_QCOM
>  	help
>  	  The Gunyah drivers are the helper interfaces that run in a guest VM
>  	  such as basic inter-VM IPC and signaling mechanisms, and higher level
> @@ -15,3 +16,15 @@ config GUNYAH
>  
>  config GUNYAH_PLATFORM_HOOKS
>  	tristate
> +
> +config GUNYAH_QCOM_PLATFORM
> +	tristate "Support for Gunyah on Qualcomm platforms"
> +	depends on GUNYAH
> +	select GUNYAH_PLATFORM_HOOKS
> +	select QCOM_SCM
> +	help
> +	  Enable support for interacting with Gunyah on Qualcomm
> +	  platforms. Interaction with Qualcomm firmware requires
> +	  extra platform-specific support.
> +
> +	  Say Y/M here to use Gunyah on Qualcomm platforms.
> diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
> index 4fbeee521d60a..2aa9ff038ed02 100644
> --- a/drivers/virt/gunyah/Makefile
> +++ b/drivers/virt/gunyah/Makefile
> @@ -1,6 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
>  
>  obj-$(CONFIG_GUNYAH_PLATFORM_HOOKS) += gunyah_platform_hooks.o
> +obj-$(CONFIG_GUNYAH_QCOM_PLATFORM) += gunyah_qcom.o
>  
>  gunyah-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o vm_mgr_mm.o
>  obj-$(CONFIG_GUNYAH) += gunyah.o
> diff --git a/drivers/virt/gunyah/gunyah_qcom.c b/drivers/virt/gunyah/gunyah_qcom.c
> new file mode 100644
> index 0000000000000..f06a598f2e1b3
> --- /dev/null
> +++ b/drivers/virt/gunyah/gunyah_qcom.c
> @@ -0,0 +1,153 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include <linux/arm-smccc.h>
> +#include <linux/gunyah_rsc_mgr.h>
> +#include <linux/module.h>
> +#include <linux/firmware/qcom/qcom_scm.h>
> +#include <linux/types.h>
> +#include <linux/uuid.h>
> +
> +#define QCOM_SCM_RM_MANAGED_VMID	0x3A
> +#define QCOM_SCM_MAX_MANAGED_VMID	0x3F
> +
> +static int qcom_scm_gh_rm_pre_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel)
> +{
> +	struct qcom_scm_vmperm *new_perms;
> +	u64 src, src_cpy;
> +	int ret = 0, i, n;
> +	u16 vmid;
> +
> +	new_perms = kcalloc(mem_parcel->n_acl_entries, sizeof(*new_perms), GFP_KERNEL);
> +	if (!new_perms)
> +		return -ENOMEM;
> +
> +	for (n = 0; n < mem_parcel->n_acl_entries; n++) {
> +		vmid = le16_to_cpu(mem_parcel->acl_entries[n].vmid);
> +		if (vmid <= QCOM_SCM_MAX_MANAGED_VMID)
> +			new_perms[n].vmid = vmid;
> +		else
> +			new_perms[n].vmid = QCOM_SCM_RM_MANAGED_VMID;
> +		if (mem_parcel->acl_entries[n].perms & GH_RM_ACL_X)
> +			new_perms[n].perm |= QCOM_SCM_PERM_EXEC;
> +		if (mem_parcel->acl_entries[n].perms & GH_RM_ACL_W)
> +			new_perms[n].perm |= QCOM_SCM_PERM_WRITE;
> +		if (mem_parcel->acl_entries[n].perms & GH_RM_ACL_R)
> +			new_perms[n].perm |= QCOM_SCM_PERM_READ;
> +	}
> +
> +	src = BIT_ULL(QCOM_SCM_VMID_HLOS);
> +
> +	for (i = 0; i < mem_parcel->n_mem_entries; i++) {
> +		src_cpy = src;
> +		ret = qcom_scm_assign_mem(le64_to_cpu(mem_parcel->mem_entries[i].phys_addr),
> +						le64_to_cpu(mem_parcel->mem_entries[i].size),
> +						&src_cpy, new_perms, mem_parcel->n_acl_entries);
> +		if (ret)
> +			break;
> +	}
> +
> +	if (!ret)
> +		goto out;

I was going to complain that you don't unroll the assignments on
failure, but now realized that this "error handling" is backwards and
actually represents the success case.

Please don't do that, goto error_handling || kfree(new_perms); return 0;
here instead.


That also means that you don't need to zero-initialize ret, because you
would goto err_reclaim inside the loop.

> +
> +	src = 0;
> +	for (n = 0; n < mem_parcel->n_acl_entries; n++) {
> +		vmid = le16_to_cpu(mem_parcel->acl_entries[n].vmid);
> +		if (vmid <= QCOM_SCM_MAX_MANAGED_VMID)
> +			src |= BIT_ULL(vmid);
> +		else
> +			src |= BIT_ULL(QCOM_SCM_RM_MANAGED_VMID);
> +	}
> +
> +	new_perms[0].vmid = QCOM_SCM_VMID_HLOS;
> +
> +	for (i--; i >= 0; i--) {
> +		src_cpy = src;
> +		WARN_ON_ONCE(qcom_scm_assign_mem(
> +				le64_to_cpu(mem_parcel->mem_entries[i].phys_addr),
> +				le64_to_cpu(mem_parcel->mem_entries[i].size),
> +				&src_cpy, new_perms, 1));
> +	}
> +
> +out:
> +	kfree(new_perms);
> +	return ret;
> +}

Regards,
Bjorn
diff mbox series

Patch

diff --git a/drivers/virt/gunyah/Kconfig b/drivers/virt/gunyah/Kconfig
index de815189dab6c..0421b751aad4f 100644
--- a/drivers/virt/gunyah/Kconfig
+++ b/drivers/virt/gunyah/Kconfig
@@ -5,6 +5,7 @@  config GUNYAH
 	depends on ARM64
 	depends on MAILBOX
 	select GUNYAH_PLATFORM_HOOKS
+	imply GUNYAH_QCOM_PLATFORM if ARCH_QCOM
 	help
 	  The Gunyah drivers are the helper interfaces that run in a guest VM
 	  such as basic inter-VM IPC and signaling mechanisms, and higher level
@@ -15,3 +16,15 @@  config GUNYAH
 
 config GUNYAH_PLATFORM_HOOKS
 	tristate
+
+config GUNYAH_QCOM_PLATFORM
+	tristate "Support for Gunyah on Qualcomm platforms"
+	depends on GUNYAH
+	select GUNYAH_PLATFORM_HOOKS
+	select QCOM_SCM
+	help
+	  Enable support for interacting with Gunyah on Qualcomm
+	  platforms. Interaction with Qualcomm firmware requires
+	  extra platform-specific support.
+
+	  Say Y/M here to use Gunyah on Qualcomm platforms.
diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
index 4fbeee521d60a..2aa9ff038ed02 100644
--- a/drivers/virt/gunyah/Makefile
+++ b/drivers/virt/gunyah/Makefile
@@ -1,6 +1,7 @@ 
 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_GUNYAH_PLATFORM_HOOKS) += gunyah_platform_hooks.o
+obj-$(CONFIG_GUNYAH_QCOM_PLATFORM) += gunyah_qcom.o
 
 gunyah-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o vm_mgr_mm.o
 obj-$(CONFIG_GUNYAH) += gunyah.o
diff --git a/drivers/virt/gunyah/gunyah_qcom.c b/drivers/virt/gunyah/gunyah_qcom.c
new file mode 100644
index 0000000000000..f06a598f2e1b3
--- /dev/null
+++ b/drivers/virt/gunyah/gunyah_qcom.c
@@ -0,0 +1,153 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/arm-smccc.h>
+#include <linux/gunyah_rsc_mgr.h>
+#include <linux/module.h>
+#include <linux/firmware/qcom/qcom_scm.h>
+#include <linux/types.h>
+#include <linux/uuid.h>
+
+#define QCOM_SCM_RM_MANAGED_VMID	0x3A
+#define QCOM_SCM_MAX_MANAGED_VMID	0x3F
+
+static int qcom_scm_gh_rm_pre_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel)
+{
+	struct qcom_scm_vmperm *new_perms;
+	u64 src, src_cpy;
+	int ret = 0, i, n;
+	u16 vmid;
+
+	new_perms = kcalloc(mem_parcel->n_acl_entries, sizeof(*new_perms), GFP_KERNEL);
+	if (!new_perms)
+		return -ENOMEM;
+
+	for (n = 0; n < mem_parcel->n_acl_entries; n++) {
+		vmid = le16_to_cpu(mem_parcel->acl_entries[n].vmid);
+		if (vmid <= QCOM_SCM_MAX_MANAGED_VMID)
+			new_perms[n].vmid = vmid;
+		else
+			new_perms[n].vmid = QCOM_SCM_RM_MANAGED_VMID;
+		if (mem_parcel->acl_entries[n].perms & GH_RM_ACL_X)
+			new_perms[n].perm |= QCOM_SCM_PERM_EXEC;
+		if (mem_parcel->acl_entries[n].perms & GH_RM_ACL_W)
+			new_perms[n].perm |= QCOM_SCM_PERM_WRITE;
+		if (mem_parcel->acl_entries[n].perms & GH_RM_ACL_R)
+			new_perms[n].perm |= QCOM_SCM_PERM_READ;
+	}
+
+	src = BIT_ULL(QCOM_SCM_VMID_HLOS);
+
+	for (i = 0; i < mem_parcel->n_mem_entries; i++) {
+		src_cpy = src;
+		ret = qcom_scm_assign_mem(le64_to_cpu(mem_parcel->mem_entries[i].phys_addr),
+						le64_to_cpu(mem_parcel->mem_entries[i].size),
+						&src_cpy, new_perms, mem_parcel->n_acl_entries);
+		if (ret)
+			break;
+	}
+
+	if (!ret)
+		goto out;
+
+	src = 0;
+	for (n = 0; n < mem_parcel->n_acl_entries; n++) {
+		vmid = le16_to_cpu(mem_parcel->acl_entries[n].vmid);
+		if (vmid <= QCOM_SCM_MAX_MANAGED_VMID)
+			src |= BIT_ULL(vmid);
+		else
+			src |= BIT_ULL(QCOM_SCM_RM_MANAGED_VMID);
+	}
+
+	new_perms[0].vmid = QCOM_SCM_VMID_HLOS;
+
+	for (i--; i >= 0; i--) {
+		src_cpy = src;
+		WARN_ON_ONCE(qcom_scm_assign_mem(
+				le64_to_cpu(mem_parcel->mem_entries[i].phys_addr),
+				le64_to_cpu(mem_parcel->mem_entries[i].size),
+				&src_cpy, new_perms, 1));
+	}
+
+out:
+	kfree(new_perms);
+	return ret;
+}
+
+static int qcom_scm_gh_rm_post_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *mem_parcel)
+{
+	struct qcom_scm_vmperm new_perms;
+	u64 src = 0, src_cpy;
+	int ret = 0, i, n;
+	u16 vmid;
+
+	new_perms.vmid = QCOM_SCM_VMID_HLOS;
+	new_perms.perm = QCOM_SCM_PERM_EXEC | QCOM_SCM_PERM_WRITE | QCOM_SCM_PERM_READ;
+
+	for (n = 0; n < mem_parcel->n_acl_entries; n++) {
+		vmid = le16_to_cpu(mem_parcel->acl_entries[n].vmid);
+		if (vmid <= QCOM_SCM_MAX_MANAGED_VMID)
+			src |= (1ull << vmid);
+		else
+			src |= (1ull << QCOM_SCM_RM_MANAGED_VMID);
+	}
+
+	for (i = 0; i < mem_parcel->n_mem_entries; i++) {
+		src_cpy = src;
+		ret = qcom_scm_assign_mem(le64_to_cpu(mem_parcel->mem_entries[i].phys_addr),
+						le64_to_cpu(mem_parcel->mem_entries[i].size),
+						&src_cpy, &new_perms, 1);
+		WARN_ON_ONCE(ret);
+	}
+
+	return ret;
+}
+
+static struct gh_rm_platform_ops qcom_scm_gh_rm_platform_ops = {
+	.pre_mem_share = qcom_scm_gh_rm_pre_mem_share,
+	.post_mem_reclaim = qcom_scm_gh_rm_post_mem_reclaim,
+};
+
+/* {19bd54bd-0b37-571b-946f-609b54539de6} */
+static const uuid_t QCOM_EXT_UUID =
+	UUID_INIT(0x19bd54bd, 0x0b37, 0x571b, 0x94, 0x6f, 0x60, 0x9b, 0x54, 0x53, 0x9d, 0xe6);
+
+#define GH_QCOM_EXT_CALL_UUID_ID	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, \
+							   ARM_SMCCC_OWNER_VENDOR_HYP, 0x3f01)
+
+static bool gh_has_qcom_extensions(void)
+{
+	struct arm_smccc_res res;
+	uuid_t uuid;
+	u32 *up;
+
+	arm_smccc_1_1_smc(GH_QCOM_EXT_CALL_UUID_ID, &res);
+
+	up = (u32 *)&uuid.b[0];
+	up[0] = lower_32_bits(res.a0);
+	up[1] = lower_32_bits(res.a1);
+	up[2] = lower_32_bits(res.a2);
+	up[3] = lower_32_bits(res.a3);
+
+	return uuid_equal(&uuid, &QCOM_EXT_UUID);
+}
+
+static int __init qcom_gh_platform_hooks_register(void)
+{
+	if (!gh_has_qcom_extensions())
+		return -ENODEV;
+
+	return gh_rm_register_platform_ops(&qcom_scm_gh_rm_platform_ops);
+}
+
+static void __exit qcom_gh_platform_hooks_unregister(void)
+{
+	gh_rm_unregister_platform_ops(&qcom_scm_gh_rm_platform_ops);
+}
+
+module_init(qcom_gh_platform_hooks_register);
+module_exit(qcom_gh_platform_hooks_unregister);
+MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Platform Hooks for Gunyah");
+MODULE_LICENSE("GPL");