[PATCH v5 1/3] x86/hypervisor: pass flags to hypervisor_flush_tlb

[Wei Liu <wl@xxxxxxx>]

Hyper-V's L0 assisted flush has fine-grained control over what gets
flushed. We need all the flags available to make the best decisions
possible.

No functional change because Xen's implementation doesn't care about
what is passed to it.

Signed-off-by: Wei Liu <liuwe@xxxxxxxxxxxxx>
Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Paul Durrant <pdurrant@xxxxxxxxxx>
---
v5:
1. Drop FLUSH_TLB_FLAGS_MASK

v2:
1. Introduce FLUSH_TLB_FLAGS_MASK
---
 xen/arch/x86/guest/hypervisor.c        |  4 ++--
 xen/arch/x86/guest/xen/xen.c           |  2 +-
 xen/arch/x86/smp.c                     |  2 +-
 xen/include/asm-x86/guest/hypervisor.h | 10 +++++-----
 4 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/xen/arch/x86/guest/hypervisor.c b/xen/arch/x86/guest/hypervisor.c
index e46de42ded..366af1d650 100644
--- a/xen/arch/x86/guest/hypervisor.c
+++ b/xen/arch/x86/guest/hypervisor.c
@@ -79,10 +79,10 @@ void __init hypervisor_e820_fixup(struct e820map *e820)
 }
 
 int hypervisor_flush_tlb(const cpumask_t *mask, const void *va,
-                         unsigned int order)
+                         unsigned int flags)
 {
     if ( ops.flush_tlb )
-        return alternative_call(ops.flush_tlb, mask, va, order);
+        return alternative_call(ops.flush_tlb, mask, va, flags);
 
     return -EOPNOTSUPP;
 }
diff --git a/xen/arch/x86/guest/xen/xen.c b/xen/arch/x86/guest/xen/xen.c
index 3bc01c8723..2ff63d370a 100644
--- a/xen/arch/x86/guest/xen/xen.c
+++ b/xen/arch/x86/guest/xen/xen.c
@@ -324,7 +324,7 @@ static void __init e820_fixup(struct e820map *e820)
         pv_shim_fixup_e820(e820);
 }
 
-static int flush_tlb(const cpumask_t *mask, const void *va, unsigned int order)
+static int flush_tlb(const cpumask_t *mask, const void *va, unsigned int flags)
 {
     return xen_hypercall_hvm_op(HVMOP_flush_tlbs, NULL);
 }
diff --git a/xen/arch/x86/smp.c b/xen/arch/x86/smp.c
index 1d9fec65de..6f1aaa2106 100644
--- a/xen/arch/x86/smp.c
+++ b/xen/arch/x86/smp.c
@@ -272,7 +272,7 @@ void flush_area_mask(const cpumask_t *mask, const void *va, 
unsigned int flags)
         if ( cpu_has_hypervisor &&
              !(flags & ~(FLUSH_TLB | FLUSH_TLB_GLOBAL | FLUSH_VA_VALID |
                          FLUSH_ORDER_MASK)) &&
-             !hypervisor_flush_tlb(mask, va, (flags - 1) & FLUSH_ORDER_MASK) )
+             !hypervisor_flush_tlb(mask, va, flags) )
             return;
 
         spin_lock(&flush_lock);
diff --git a/xen/include/asm-x86/guest/hypervisor.h 
b/xen/include/asm-x86/guest/hypervisor.h
index 77a1d21824..0a6c3b47ab 100644
--- a/xen/include/asm-x86/guest/hypervisor.h
+++ b/xen/include/asm-x86/guest/hypervisor.h
@@ -35,7 +35,7 @@ struct hypervisor_ops {
     /* Fix up e820 map */
     void (*e820_fixup)(struct e820map *e820);
     /* L0 assisted TLB flush */
-    int (*flush_tlb)(const cpumask_t *mask, const void *va, unsigned int 
order);
+    int (*flush_tlb)(const cpumask_t *mask, const void *va, unsigned int 
flags);
 };
 
 #ifdef CONFIG_GUEST
@@ -48,11 +48,11 @@ void hypervisor_e820_fixup(struct e820map *e820);
 /*
  * L0 assisted TLB flush.
  * mask: cpumask of the dirty vCPUs that should be flushed.
- * va: linear address to flush, or NULL for global flushes.
- * order: order of the linear address pointed by va.
+ * va: linear address to flush, or NULL for entire address space.
+ * flags: flags for flushing, including the order of va.
  */
 int hypervisor_flush_tlb(const cpumask_t *mask, const void *va,
-                         unsigned int order);
+                         unsigned int flags);
 
 #else
 
@@ -65,7 +65,7 @@ static inline int hypervisor_ap_setup(void) { return 0; }
 static inline void hypervisor_resume(void) { ASSERT_UNREACHABLE(); }
 static inline void hypervisor_e820_fixup(struct e820map *e820) {}
 static inline int hypervisor_flush_tlb(const cpumask_t *mask, const void *va,
-                                       unsigned int order)
+                                       unsigned int flags)
 {
     return -EOPNOTSUPP;
 }
-- 
2.20.1