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[xen staging] x86/HVM: expose VM assist hypercall

commit f13404d57f55a97838f1c16a366fbc3231ec21f1
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Apr 22 12:58:25 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Apr 22 12:58:25 2020 +0200

    x86/HVM: expose VM assist hypercall
    
    In preparation for the addition of VMASST_TYPE_runstate_update_flag
    commit 72c538cca957 ("arm: add support for vm_assist hypercall") enabled
    the hypercall for Arm. I consider it not logical that it then isn't also
    exposed to x86 HVM guests (with the same single feature permitted to be
    enabled as Arm has); Linux actually tries to use it afaict.
    
    Rather than introducing yet another thin wrapper around vm_assist(),
    make that function the main handler, requiring a per-arch
    arch_vm_assist_valid_mask() definition instead.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/arch/x86/domain.c        |  3 +++
 xen/arch/x86/hvm/hypercall.c |  1 +
 xen/arch/x86/pv/hypercall.c  |  2 +-
 xen/common/compat/kernel.c   |  5 -----
 xen/common/domain.c          | 13 ++++++++-----
 xen/common/kernel.c          |  7 -------
 xen/include/asm-arm/config.h |  2 --
 xen/include/asm-arm/domain.h |  2 ++
 xen/include/asm-x86/config.h | 11 -----------
 xen/include/asm-x86/domain.h | 19 +++++++++++++++++++
 xen/include/xen/hypercall.h  |  2 --
 xen/include/xen/lib.h        |  2 --
 12 files changed, 34 insertions(+), 35 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index a008d7df1c..7f18f4a88a 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -939,6 +939,9 @@ int arch_set_info_guest(
         v->arch.dr6 = c(debugreg[6]);
         v->arch.dr7 = c(debugreg[7]);
 
+        if ( v->vcpu_id == 0 )
+            d->vm_assist = c.nat->vm_assist;
+
         hvm_set_info_guest(v);
         goto out;
     }
diff --git a/xen/arch/x86/hvm/hypercall.c b/xen/arch/x86/hvm/hypercall.c
index cedc7f2ac5..b4a0aeab50 100644
--- a/xen/arch/x86/hvm/hypercall.c
+++ b/xen/arch/x86/hvm/hypercall.c
@@ -128,6 +128,7 @@ static const hypercall_table_t hvm_hypercall_table[] = {
 #ifdef CONFIG_GRANT_TABLE
     HVM_CALL(grant_table_op),
 #endif
+    HYPERCALL(vm_assist),
     COMPAT_CALL(vcpu_op),
     HVM_CALL(physdev_op),
     COMPAT_CALL(xen_version),
diff --git a/xen/arch/x86/pv/hypercall.c b/xen/arch/x86/pv/hypercall.c
index 17ddf9ea1f..686a7f2c5c 100644
--- a/xen/arch/x86/pv/hypercall.c
+++ b/xen/arch/x86/pv/hypercall.c
@@ -57,7 +57,7 @@ const hypercall_table_t pv_hypercall_table[] = {
 #ifdef CONFIG_GRANT_TABLE
     COMPAT_CALL(grant_table_op),
 #endif
-    COMPAT_CALL(vm_assist),
+    HYPERCALL(vm_assist),
     COMPAT_CALL(update_va_mapping_otherdomain),
     COMPAT_CALL(iret),
     COMPAT_CALL(vcpu_op),
diff --git a/xen/common/compat/kernel.c b/xen/common/compat/kernel.c
index 5c6e7322f8..804b919bdc 100644
--- a/xen/common/compat/kernel.c
+++ b/xen/common/compat/kernel.c
@@ -37,11 +37,6 @@ CHECK_TYPE(capabilities_info);
 
 CHECK_TYPE(domain_handle);
 
-#ifdef COMPAT_VM_ASSIST_VALID
-#undef VM_ASSIST_VALID
-#define VM_ASSIST_VALID COMPAT_VM_ASSIST_VALID
-#endif
-
 #define DO(fn) int compat_##fn
 #define COMPAT
 
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 3dcd73f67c..7cc9526139 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1517,20 +1517,23 @@ long do_vcpu_op(int cmd, unsigned int vcpuid, 
XEN_GUEST_HANDLE_PARAM(void) arg)
     return rc;
 }
 
-#ifdef VM_ASSIST_VALID
-long vm_assist(struct domain *p, unsigned int cmd, unsigned int type,
-               unsigned long valid)
+#ifdef arch_vm_assist_valid_mask
+long do_vm_assist(unsigned int cmd, unsigned int type)
 {
+    struct domain *currd = current->domain;
+    const unsigned long valid = arch_vm_assist_valid_mask(currd);
+
     if ( type >= BITS_PER_LONG || !test_bit(type, &valid) )
         return -EINVAL;
 
     switch ( cmd )
     {
     case VMASST_CMD_enable:
-        set_bit(type, &p->vm_assist);
+        set_bit(type, &currd->vm_assist);
         return 0;
+
     case VMASST_CMD_disable:
-        clear_bit(type, &p->vm_assist);
+        clear_bit(type, &currd->vm_assist);
         return 0;
     }
 
diff --git a/xen/common/kernel.c b/xen/common/kernel.c
index 22941cec94..572e3fc07d 100644
--- a/xen/common/kernel.c
+++ b/xen/common/kernel.c
@@ -566,13 +566,6 @@ DO(xen_version)(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
     return -ENOSYS;
 }
 
-#ifdef VM_ASSIST_VALID
-DO(vm_assist)(unsigned int cmd, unsigned int type)
-{
-    return vm_assist(current->domain, cmd, type, VM_ASSIST_VALID);
-}
-#endif
-
 /*
  * Local variables:
  * mode: C
diff --git a/xen/include/asm-arm/config.h b/xen/include/asm-arm/config.h
index bc89e84f4d..fbb4b23a69 100644
--- a/xen/include/asm-arm/config.h
+++ b/xen/include/asm-arm/config.h
@@ -195,8 +195,6 @@ extern unsigned long frametable_virt_end;
 #define watchdog_disable() ((void)0)
 #define watchdog_enable()  ((void)0)
 
-#define VM_ASSIST_VALID          (1UL << VMASST_TYPE_runstate_update_flag)
-
 #endif /* __ARM_CONFIG_H__ */
 /*
  * Local variables:
diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
index d2142c6707..4e2f582006 100644
--- a/xen/include/asm-arm/domain.h
+++ b/xen/include/asm-arm/domain.h
@@ -262,6 +262,8 @@ static inline void free_vcpu_guest_context(struct 
vcpu_guest_context *vgc)
 
 static inline void arch_vcpu_block(struct vcpu *v) {}
 
+#define arch_vm_assist_valid_mask(d) (1UL << VMASST_TYPE_runstate_update_flag)
+
 #endif /* __ASM_DOMAIN_H__ */
 
 /*
diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h
index a34053c4c0..2d6393e64e 100644
--- a/xen/include/asm-x86/config.h
+++ b/xen/include/asm-x86/config.h
@@ -309,17 +309,6 @@ extern unsigned long xen_phys_start;
 #define ARG_XLAT_START(v)        \
     (ARG_XLAT_VIRT_START + ((v)->vcpu_id << ARG_XLAT_VA_SHIFT))
 
-#define NATIVE_VM_ASSIST_VALID   ((1UL << VMASST_TYPE_4gb_segments)        | \
-                                  (1UL << VMASST_TYPE_4gb_segments_notify) | \
-                                  (1UL << VMASST_TYPE_writable_pagetables) | \
-                                  (1UL << VMASST_TYPE_pae_extended_cr3)    | \
-                                  (1UL << VMASST_TYPE_architectural_iopl)  | \
-                                  (1UL << VMASST_TYPE_runstate_update_flag)| \
-                                  (1UL << VMASST_TYPE_m2p_strict))
-#define VM_ASSIST_VALID          NATIVE_VM_ASSIST_VALID
-#define COMPAT_VM_ASSIST_VALID   (NATIVE_VM_ASSIST_VALID & \
-                                  ((1UL << COMPAT_BITS_PER_LONG) - 1))
-
 #define ELFSIZE 64
 
 #define ARCH_CRASH_SAVE_VMCOREINFO
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 1e409c665d..b10d74fb57 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -701,6 +701,25 @@ static inline void pv_inject_sw_interrupt(unsigned int 
vector)
     pv_inject_event(&event);
 }
 
+#define PV32_VM_ASSIST_MASK ((1UL << VMASST_TYPE_4gb_segments)        | \
+                             (1UL << VMASST_TYPE_4gb_segments_notify) | \
+                             (1UL << VMASST_TYPE_writable_pagetables) | \
+                             (1UL << VMASST_TYPE_pae_extended_cr3)    | \
+                             (1UL << VMASST_TYPE_architectural_iopl)  | \
+                             (1UL << VMASST_TYPE_runstate_update_flag))
+/*
+ * Various of what PV32_VM_ASSIST_MASK has isn't really applicable to 64-bit,
+ * but we can't make such requests fail all of the sudden.
+ */
+#define PV64_VM_ASSIST_MASK (PV32_VM_ASSIST_MASK                      | \
+                             (1UL << VMASST_TYPE_m2p_strict))
+#define HVM_VM_ASSIST_MASK  (1UL << VMASST_TYPE_runstate_update_flag)
+
+#define arch_vm_assist_valid_mask(d) \
+    (is_hvm_domain(d) ? HVM_VM_ASSIST_MASK \
+                      : is_pv_32bit_domain(d) ? PV32_VM_ASSIST_MASK \
+                                              : PV64_VM_ASSIST_MASK)
+
 #endif /* __ASM_DOMAIN_H__ */
 
 /*
diff --git a/xen/include/xen/hypercall.h b/xen/include/xen/hypercall.h
index ad8ad27b23..d82a293377 100644
--- a/xen/include/xen/hypercall.h
+++ b/xen/include/xen/hypercall.h
@@ -192,8 +192,6 @@ extern int compat_xsm_op(
 
 extern int compat_kexec_op(unsigned long op, XEN_GUEST_HANDLE_PARAM(void) 
uarg);
 
-extern int compat_vm_assist(unsigned int cmd, unsigned int type);
-
 DEFINE_XEN_GUEST_HANDLE(multicall_entry_compat_t);
 extern int compat_multicall(
     XEN_GUEST_HANDLE_PARAM(multicall_entry_compat_t) call_list,
diff --git a/xen/include/xen/lib.h b/xen/include/xen/lib.h
index 5d718bbdba..2d7a054931 100644
--- a/xen/include/xen/lib.h
+++ b/xen/include/xen/lib.h
@@ -122,8 +122,6 @@ extern void guest_printk(const struct domain *d, const char 
*format, ...)
     __attribute__ ((format (printf, 2, 3)));
 extern void noreturn panic(const char *format, ...)
     __attribute__ ((format (printf, 1, 2)));
-extern long vm_assist(struct domain *, unsigned int cmd, unsigned int type,
-                      unsigned long valid);
 extern int __printk_ratelimit(int ratelimit_ms, int ratelimit_burst);
 extern int printk_ratelimit(void);
 
--
generated by git-patchbot for /home/xen/git/xen.git#staging

 

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