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Subject[PATCH v9 07/18] virt: acrn: Introduce an ioctl to set vCPU registers state
Date
From: Shuo Liu <shuo.a.liu@intel.com>

A virtual CPU of User VM has different context due to the different
registers state. ACRN userspace needs to set the virtual CPU
registers state (e.g. giving a initial registers state to a virtual
BSP of a User VM).

HSM provides an ioctl ACRN_IOCTL_SET_VCPU_REGS to do the virtual CPU
registers state setting. The ioctl passes the registers state from ACRN
userspace to the hypervisor directly.

Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/virt/acrn/hsm.c | 34 +++++++++-
drivers/virt/acrn/hypercall.h | 13 ++++
include/uapi/linux/acrn.h | 119 ++++++++++++++++++++++++++++++++++
3 files changed, 165 insertions(+), 1 deletion(-)

diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c
index 5fd933471683..ee5cc7413239 100644
--- a/drivers/virt/acrn/hsm.c
+++ b/drivers/virt/acrn/hsm.c
@@ -9,6 +9,7 @@
* Yakui Zhao <yakui.zhao@intel.com>
*/

+#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>
@@ -46,7 +47,8 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
{
struct acrn_vm *vm = filp->private_data;
struct acrn_vm_creation *vm_param;
- int ret = 0;
+ struct acrn_vcpu_regs *cpu_regs;
+ int i, ret = 0;

if (vm->vmid == ACRN_INVALID_VMID && cmd != ACRN_IOCTL_CREATE_VM) {
dev_dbg(acrn_dev.this_device,
@@ -100,6 +102,36 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
case ACRN_IOCTL_DESTROY_VM:
ret = acrn_vm_destroy(vm);
break;
+ case ACRN_IOCTL_SET_VCPU_REGS:
+ cpu_regs = memdup_user((void __user *)ioctl_param,
+ sizeof(struct acrn_vcpu_regs));
+ if (IS_ERR(cpu_regs))
+ return PTR_ERR(cpu_regs);
+
+ for (i = 0; i < ARRAY_SIZE(cpu_regs->reserved); i++)
+ if (cpu_regs->reserved[i])
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_32); i++)
+ if (cpu_regs->vcpu_regs.reserved_32[i])
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_64); i++)
+ if (cpu_regs->vcpu_regs.reserved_64[i])
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.gdt.reserved); i++)
+ if (cpu_regs->vcpu_regs.gdt.reserved[i] |
+ cpu_regs->vcpu_regs.idt.reserved[i])
+ return -EINVAL;
+
+ ret = hcall_set_vcpu_regs(vm->vmid, virt_to_phys(cpu_regs));
+ if (ret < 0)
+ dev_dbg(acrn_dev.this_device,
+ "Failed to set regs state of VM%u!\n",
+ vm->vmid);
+ kfree(cpu_regs);
+ break;
default:
dev_dbg(acrn_dev.this_device, "Unknown IOCTL 0x%x!\n", cmd);
ret = -ENOTTY;
diff --git a/drivers/virt/acrn/hypercall.h b/drivers/virt/acrn/hypercall.h
index 426b66cadb1f..f29cfae08862 100644
--- a/drivers/virt/acrn/hypercall.h
+++ b/drivers/virt/acrn/hypercall.h
@@ -19,6 +19,7 @@
#define HC_START_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x02)
#define HC_PAUSE_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x03)
#define HC_RESET_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x05)
+#define HC_SET_VCPU_REGS _HC_ID(HC_ID, HC_ID_VM_BASE + 0x06)

/**
* hcall_create_vm() - Create a User VM
@@ -75,4 +76,16 @@ static inline long hcall_reset_vm(u64 vmid)
return acrn_hypercall1(HC_RESET_VM, vmid);
}

+/**
+ * hcall_set_vcpu_regs() - Set up registers of virtual CPU of a User VM
+ * @vmid: User VM ID
+ * @regs_state: Service VM GPA of registers state
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static inline long hcall_set_vcpu_regs(u64 vmid, u64 regs_state)
+{
+ return acrn_hypercall2(HC_SET_VCPU_REGS, vmid, regs_state);
+}
+
#endif /* __ACRN_HSM_HYPERCALL_H */
diff --git a/include/uapi/linux/acrn.h b/include/uapi/linux/acrn.h
index 32521168075f..775c58bad026 100644
--- a/include/uapi/linux/acrn.h
+++ b/include/uapi/linux/acrn.h
@@ -38,6 +38,123 @@ struct acrn_vm_creation {
__u64 cpu_affinity;
};

+/**
+ * struct acrn_gp_regs - General registers of a User VM
+ * @rax: Value of register RAX
+ * @rcx: Value of register RCX
+ * @rdx: Value of register RDX
+ * @rbx: Value of register RBX
+ * @rsp: Value of register RSP
+ * @rbp: Value of register RBP
+ * @rsi: Value of register RSI
+ * @rdi: Value of register RDI
+ * @r8: Value of register R8
+ * @r9: Value of register R9
+ * @r10: Value of register R10
+ * @r11: Value of register R11
+ * @r12: Value of register R12
+ * @r13: Value of register R13
+ * @r14: Value of register R14
+ * @r15: Value of register R15
+ */
+struct acrn_gp_regs {
+ __le64 rax;
+ __le64 rcx;
+ __le64 rdx;
+ __le64 rbx;
+ __le64 rsp;
+ __le64 rbp;
+ __le64 rsi;
+ __le64 rdi;
+ __le64 r8;
+ __le64 r9;
+ __le64 r10;
+ __le64 r11;
+ __le64 r12;
+ __le64 r13;
+ __le64 r14;
+ __le64 r15;
+};
+
+/**
+ * struct acrn_descriptor_ptr - Segment descriptor table of a User VM.
+ * @limit: Limit field.
+ * @base: Base field.
+ * @reserved: Reserved and must be 0.
+ */
+struct acrn_descriptor_ptr {
+ __le16 limit;
+ __le64 base;
+ __le16 reserved[3];
+} __attribute__ ((__packed__));
+
+/**
+ * struct acrn_regs - Registers structure of a User VM
+ * @gprs: General registers
+ * @gdt: Global Descriptor Table
+ * @idt: Interrupt Descriptor Table
+ * @rip: Value of register RIP
+ * @cs_base: Base of code segment selector
+ * @cr0: Value of register CR0
+ * @cr4: Value of register CR4
+ * @cr3: Value of register CR3
+ * @ia32_efer: Value of IA32_EFER MSR
+ * @rflags: Value of regsiter RFLAGS
+ * @reserved_64: Reserved and must be 0
+ * @cs_ar: Attribute field of code segment selector
+ * @cs_limit: Limit field of code segment selector
+ * @reserved_32: Reserved and must be 0
+ * @cs_sel: Value of code segment selector
+ * @ss_sel: Value of stack segment selector
+ * @ds_sel: Value of data segment selector
+ * @es_sel: Value of extra segment selector
+ * @fs_sel: Value of FS selector
+ * @gs_sel: Value of GS selector
+ * @ldt_sel: Value of LDT descriptor selector
+ * @tr_sel: Value of TSS descriptor selector
+ */
+struct acrn_regs {
+ struct acrn_gp_regs gprs;
+ struct acrn_descriptor_ptr gdt;
+ struct acrn_descriptor_ptr idt;
+
+ __le64 rip;
+ __le64 cs_base;
+ __le64 cr0;
+ __le64 cr4;
+ __le64 cr3;
+ __le64 ia32_efer;
+ __le64 rflags;
+ __le64 reserved_64[4];
+
+ __le32 cs_ar;
+ __le32 cs_limit;
+ __le32 reserved_32[3];
+
+ __le16 cs_sel;
+ __le16 ss_sel;
+ __le16 ds_sel;
+ __le16 es_sel;
+ __le16 fs_sel;
+ __le16 gs_sel;
+ __le16 ldt_sel;
+ __le16 tr_sel;
+};
+
+/**
+ * struct acrn_vcpu_regs - Info of vCPU registers state
+ * @vcpu_id: vCPU ID
+ * @reserved: Reserved and must be 0
+ * @vcpu_regs: vCPU registers state
+ *
+ * This structure will be passed to hypervisor directly.
+ */
+struct acrn_vcpu_regs {
+ __u16 vcpu_id;
+ __u16 reserved[3];
+ struct acrn_regs vcpu_regs;
+};
+
/* The ioctl type, documented in ioctl-number.rst */
#define ACRN_IOCTL_TYPE 0xA2

@@ -54,5 +171,7 @@ struct acrn_vm_creation {
_IO(ACRN_IOCTL_TYPE, 0x13)
#define ACRN_IOCTL_RESET_VM \
_IO(ACRN_IOCTL_TYPE, 0x15)
+#define ACRN_IOCTL_SET_VCPU_REGS \
+ _IOW(ACRN_IOCTL_TYPE, 0x16, struct acrn_vcpu_regs)

#endif /* _UAPI_ACRN_H */
--
2.28.0
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