Messages in this thread | | | Date | Fri, 8 Jan 2021 16:33:22 +0100 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH v7 07/18] virt: acrn: Introduce an ioctl to set vCPU registers state |
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On Wed, Jan 06, 2021 at 03:50:44PM +0800, shuo.a.liu@intel.com wrote: > 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 | 21 ++++++++++- > drivers/virt/acrn/hypercall.h | 13 +++++++ > include/uapi/linux/acrn.h | 69 +++++++++++++++++++++++++++++++++++ > 3 files changed, 102 insertions(+), 1 deletion(-) > > diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c > index 5fd933471683..2d04ebaa43f8 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 +102,23 @@ 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; > + > + 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 e1608b8a50a2..d5d66b93586e 100644 > --- a/include/uapi/linux/acrn.h > +++ b/include/uapi/linux/acrn.h > @@ -35,6 +35,73 @@ struct acrn_vm_creation { > __u64 cpu_affinity; > }; > > +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 { > + __le16 limit; > + __le64 base; > + __le16 reserved[3]; > +} __attribute__ ((__packed__)); > + > +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; > +};
No documentation of what these variables are anywhere?
What about the reserved slots, what must they be set to?
> + > +/** > + * struct acrn_vcpu_regs - Info of vCPU registers state > + * @vcpu_id: vCPU ID > + * @reserved: Reserved and must be 0
You actually checked this, nice!
thanks,
greg k-h
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