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virt: acrn: Introduce an ioctl to set vCPU registers state

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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.

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>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-8-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuo Liu 2021-02-07 11:10:29 +08:00 committed by Greg Kroah-Hartman
parent 9c5137aedd
commit 2ad2aaee1b
3 changed files with 165 additions and 1 deletions
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34
drivers/virt/acrn/hsm.c
View File

@ -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;

13
drivers/virt/acrn/hypercall.h
View File

@ -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 */

119
include/uapi/linux/acrn.h
View File

@ -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 */