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Message-Id: <20200825024516.16766-8-shuo.a.liu@intel.com>
Date: Tue, 25 Aug 2020 10:45:07 +0800
From: shuo.a.liu@...el.com
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"H . Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Sean Christopherson <sean.j.christopherson@...el.com>,
Yu Wang <yu1.wang@...el.com>,
Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
Shuo Liu <shuo.a.liu@...el.com>,
Zhi Wang <zhi.a.wang@...el.com>,
Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: [PATCH 07/17] virt: acrn: Introduce an ioctl to set vCPU registers state
From: Shuo Liu <shuo.a.liu@...el.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@...el.com>
Reviewed-by: Zhi Wang <zhi.a.wang@...el.com>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Cc: Zhi Wang <zhi.a.wang@...el.com>
Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>
Cc: Yu Wang <yu1.wang@...el.com>
Cc: Reinette Chatre <reinette.chatre@...el.com>
---
drivers/virt/acrn/hsm.c | 13 +++++++
drivers/virt/acrn/hypercall.h | 13 +++++++
include/uapi/linux/acrn.h | 71 +++++++++++++++++++++++++++++++++++
3 files changed, 97 insertions(+)
diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c
index ed8921a6c68b..31dec2f1aa12 100644
--- a/drivers/virt/acrn/hsm.c
+++ b/drivers/virt/acrn/hsm.c
@@ -11,6 +11,7 @@
#define pr_fmt(fmt) "acrn: " fmt
+#include <linux/io.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/module.h>
@@ -47,6 +48,7 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
{
struct acrn_vm *vm = filp->private_data;
struct acrn_vm_creation *vm_param;
+ struct acrn_vcpu_regs *cpu_regs;
int ret = 0;
if (cmd == ACRN_IOCTL_GET_API_VERSION) {
@@ -101,6 +103,17 @@ 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);
+
+ ret = hcall_set_vcpu_regs(vm->vmid, virt_to_phys(cpu_regs));
+ if (ret < 0)
+ pr_err("Failed to set regs state of VM%u!\n", vm->vmid);
+ kfree(cpu_regs);
+ break;
default:
pr_warn("Unknown IOCTL 0x%x!\n", cmd);
ret = -EINVAL;
diff --git a/drivers/virt/acrn/hypercall.h b/drivers/virt/acrn/hypercall.h
index 6429e7a06e7e..5cc975db38d9 100644
--- a/drivers/virt/acrn/hypercall.h
+++ b/drivers/virt/acrn/hypercall.h
@@ -22,6 +22,7 @@
#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_get_api_version() - Get API version from hypervisor
@@ -89,4 +90,16 @@ 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 f8f00b18cd46..392d59a46499 100644
--- a/include/uapi/linux/acrn.h
+++ b/include/uapi/linux/acrn.h
@@ -46,6 +46,75 @@ struct acrn_vm_creation {
__u8 reserved2[8];
} __attribute__((aligned(8)));
+struct acrn_gp_regs {
+ __u64 rax;
+ __u64 rcx;
+ __u64 rdx;
+ __u64 rbx;
+ __u64 rsp;
+ __u64 rbp;
+ __u64 rsi;
+ __u64 rdi;
+ __u64 r8;
+ __u64 r9;
+ __u64 r10;
+ __u64 r11;
+ __u64 r12;
+ __u64 r13;
+ __u64 r14;
+ __u64 r15;
+};
+
+struct acrn_descriptor_ptr {
+ __u16 limit;
+ __u64 base;
+ __u16 reserved[3];
+} __attribute__ ((__packed__));
+
+struct acrn_regs {
+ struct acrn_gp_regs gprs;
+ struct acrn_descriptor_ptr gdt;
+ struct acrn_descriptor_ptr idt;
+
+ __u64 rip;
+ __u64 cs_base;
+ __u64 cr0;
+ __u64 cr4;
+ __u64 cr3;
+ __u64 ia32_efer;
+ __u64 rflags;
+ __u64 reserved_64[4];
+
+ __u32 cs_ar;
+ __u32 cs_limit;
+ __u32 reserved_32[3];
+
+ __u16 cs_sel;
+ __u16 ss_sel;
+ __u16 ds_sel;
+ __u16 es_sel;
+ __u16 fs_sel;
+ __u16 gs_sel;
+ __u16 ldt_sel;
+ __u16 tr_sel;
+
+ __u16 reserved_16[4];
+};
+
+/**
+ * struct acrn_vcpu_regs - Info of vCPU registers state
+ * @vcpu_id: vCPU ID
+ * @reserved0: Reserved
+ * @vcpu_regs: vCPU registers state
+ *
+ * This structure will be passed to hypervisor directly.
+ */
+struct acrn_vcpu_regs {
+ __u16 vcpu_id;
+ __u16 reserved0[3];
+ struct acrn_regs vcpu_regs;
+} __attribute__((aligned(8)));
+
/* The ioctl type, documented in ioctl-number.rst */
#define ACRN_IOCTL_TYPE 0xA2
@@ -65,5 +134,7 @@ 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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