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virt: acrn: Introduce an ioctl to set vCPU registers state
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
Greg Kroah-Hartman
parent
9c5137aedd
commit
2ad2aaee1b
3 changed files with 165 additions and 1 deletions
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@ -9,6 +9,7 @@
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* Yakui Zhao <yakui.zhao@intel.com>
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*/
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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@ -46,7 +47,8 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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{
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struct acrn_vm *vm = filp->private_data;
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struct acrn_vm_creation *vm_param;
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int ret = 0;
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struct acrn_vcpu_regs *cpu_regs;
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int i, ret = 0;
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if (vm->vmid == ACRN_INVALID_VMID && cmd != ACRN_IOCTL_CREATE_VM) {
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dev_dbg(acrn_dev.this_device,
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@ -100,6 +102,36 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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case ACRN_IOCTL_DESTROY_VM:
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ret = acrn_vm_destroy(vm);
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break;
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case ACRN_IOCTL_SET_VCPU_REGS:
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cpu_regs = memdup_user((void __user *)ioctl_param,
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sizeof(struct acrn_vcpu_regs));
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if (IS_ERR(cpu_regs))
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return PTR_ERR(cpu_regs);
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for (i = 0; i < ARRAY_SIZE(cpu_regs->reserved); i++)
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if (cpu_regs->reserved[i])
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_32); i++)
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if (cpu_regs->vcpu_regs.reserved_32[i])
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_64); i++)
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if (cpu_regs->vcpu_regs.reserved_64[i])
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.gdt.reserved); i++)
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if (cpu_regs->vcpu_regs.gdt.reserved[i] |
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cpu_regs->vcpu_regs.idt.reserved[i])
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return -EINVAL;
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ret = hcall_set_vcpu_regs(vm->vmid, virt_to_phys(cpu_regs));
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Failed to set regs state of VM%u!\n",
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vm->vmid);
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kfree(cpu_regs);
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break;
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default:
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dev_dbg(acrn_dev.this_device, "Unknown IOCTL 0x%x!\n", cmd);
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ret = -ENOTTY;
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@ -19,6 +19,7 @@
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#define HC_START_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x02)
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#define HC_PAUSE_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x03)
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#define HC_RESET_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x05)
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#define HC_SET_VCPU_REGS _HC_ID(HC_ID, HC_ID_VM_BASE + 0x06)
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/**
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* hcall_create_vm() - Create a User VM
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@ -75,4 +76,16 @@ static inline long hcall_reset_vm(u64 vmid)
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return acrn_hypercall1(HC_RESET_VM, vmid);
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}
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/**
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* hcall_set_vcpu_regs() - Set up registers of virtual CPU of a User VM
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* @vmid: User VM ID
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* @regs_state: Service VM GPA of registers state
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_set_vcpu_regs(u64 vmid, u64 regs_state)
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{
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return acrn_hypercall2(HC_SET_VCPU_REGS, vmid, regs_state);
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}
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#endif /* __ACRN_HSM_HYPERCALL_H */
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@ -38,6 +38,123 @@ struct acrn_vm_creation {
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__u64 cpu_affinity;
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};
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/**
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* struct acrn_gp_regs - General registers of a User VM
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* @rax: Value of register RAX
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* @rcx: Value of register RCX
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* @rdx: Value of register RDX
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* @rbx: Value of register RBX
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* @rsp: Value of register RSP
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* @rbp: Value of register RBP
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* @rsi: Value of register RSI
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* @rdi: Value of register RDI
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* @r8: Value of register R8
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* @r9: Value of register R9
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* @r10: Value of register R10
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* @r11: Value of register R11
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* @r12: Value of register R12
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* @r13: Value of register R13
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* @r14: Value of register R14
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* @r15: Value of register R15
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*/
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struct acrn_gp_regs {
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__le64 rax;
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__le64 rcx;
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__le64 rdx;
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__le64 rbx;
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__le64 rsp;
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__le64 rbp;
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__le64 rsi;
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__le64 rdi;
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__le64 r8;
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__le64 r9;
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__le64 r10;
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__le64 r11;
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__le64 r12;
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__le64 r13;
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__le64 r14;
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__le64 r15;
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};
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/**
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* struct acrn_descriptor_ptr - Segment descriptor table of a User VM.
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* @limit: Limit field.
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* @base: Base field.
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* @reserved: Reserved and must be 0.
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*/
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struct acrn_descriptor_ptr {
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__le16 limit;
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__le64 base;
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__le16 reserved[3];
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} __attribute__ ((__packed__));
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/**
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* struct acrn_regs - Registers structure of a User VM
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* @gprs: General registers
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* @gdt: Global Descriptor Table
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* @idt: Interrupt Descriptor Table
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* @rip: Value of register RIP
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* @cs_base: Base of code segment selector
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* @cr0: Value of register CR0
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* @cr4: Value of register CR4
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* @cr3: Value of register CR3
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* @ia32_efer: Value of IA32_EFER MSR
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* @rflags: Value of regsiter RFLAGS
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* @reserved_64: Reserved and must be 0
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* @cs_ar: Attribute field of code segment selector
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* @cs_limit: Limit field of code segment selector
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* @reserved_32: Reserved and must be 0
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* @cs_sel: Value of code segment selector
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* @ss_sel: Value of stack segment selector
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* @ds_sel: Value of data segment selector
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* @es_sel: Value of extra segment selector
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* @fs_sel: Value of FS selector
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* @gs_sel: Value of GS selector
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* @ldt_sel: Value of LDT descriptor selector
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* @tr_sel: Value of TSS descriptor selector
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*/
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struct acrn_regs {
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struct acrn_gp_regs gprs;
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struct acrn_descriptor_ptr gdt;
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struct acrn_descriptor_ptr idt;
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__le64 rip;
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__le64 cs_base;
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__le64 cr0;
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__le64 cr4;
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__le64 cr3;
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__le64 ia32_efer;
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__le64 rflags;
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__le64 reserved_64[4];
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__le32 cs_ar;
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__le32 cs_limit;
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__le32 reserved_32[3];
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__le16 cs_sel;
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__le16 ss_sel;
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__le16 ds_sel;
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__le16 es_sel;
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__le16 fs_sel;
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__le16 gs_sel;
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__le16 ldt_sel;
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__le16 tr_sel;
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};
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/**
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* struct acrn_vcpu_regs - Info of vCPU registers state
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* @vcpu_id: vCPU ID
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* @reserved: Reserved and must be 0
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* @vcpu_regs: vCPU registers state
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*
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* This structure will be passed to hypervisor directly.
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*/
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struct acrn_vcpu_regs {
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__u16 vcpu_id;
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__u16 reserved[3];
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struct acrn_regs vcpu_regs;
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};
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/* The ioctl type, documented in ioctl-number.rst */
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#define ACRN_IOCTL_TYPE 0xA2
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@ -54,5 +171,7 @@ struct acrn_vm_creation {
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_IO(ACRN_IOCTL_TYPE, 0x13)
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#define ACRN_IOCTL_RESET_VM \
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_IO(ACRN_IOCTL_TYPE, 0x15)
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#define ACRN_IOCTL_SET_VCPU_REGS \
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_IOW(ACRN_IOCTL_TYPE, 0x16, struct acrn_vcpu_regs)
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#endif /* _UAPI_ACRN_H */
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