x86/hyper-v: Implement rep hypercalls

Rep hypercalls are normal hypercalls which perform multiple actions at
once. Hyper-V guarantees to return exectution to the caller in not more
than 50us and the caller needs to use hypercall continuation. Touch NMI
watchdog between hypercall invocations.

This is going to be used for HvFlushVirtualAddressList hypercall for
remote TLB flushing.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jork Loeser <Jork.Loeser@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Simon Xiao <sixiao@microsoft.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: devel@linuxdriverproject.org
Link: http://lkml.kernel.org/r/20170802160921.21791-6-vkuznets@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index e484255bd9de..efa1860276b5 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -3,6 +3,7 @@
 
 #include <linux/types.h>
 #include <linux/atomic.h>
+#include <linux/nmi.h>
 #include <asm/io.h>
 #include <asm/hyperv.h>
 
@@ -209,7 +210,13 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
         return hv_status;
 }
 
+#define HV_HYPERCALL_RESULT_MASK        GENMASK_ULL(15, 0)
 #define HV_HYPERCALL_FAST_BIT           BIT(16)
+#define HV_HYPERCALL_VARHEAD_OFFSET     17
+#define HV_HYPERCALL_REP_COMP_OFFSET    32
+#define HV_HYPERCALL_REP_COMP_MASK      GENMASK_ULL(43, 32)
+#define HV_HYPERCALL_REP_START_OFFSET   48
+#define HV_HYPERCALL_REP_START_MASK     GENMASK_ULL(59, 48)
 
 /* Fast hypercall with 8 bytes of input and no output */
 static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
@@ -243,6 +250,38 @@ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
                 return hv_status;
 }
 
+/*
+ * Rep hypercalls. Callers of this functions are supposed to ensure that
+ * rep_count and varhead_size comply with Hyper-V hypercall definition.
+ */
+static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,
+                                      void *input, void *output)
+{
+        u64 control = code;
+        u64 status;
+        u16 rep_comp;
+
+        control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
+        control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
+
+        do {
+                status = hv_do_hypercall(control, input, output);
+                if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS)
+                        return status;
+
+                /* Bits 32-43 of status have 'Reps completed' data. */
+                rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >>
+                        HV_HYPERCALL_REP_COMP_OFFSET;
+
+                control &= ~HV_HYPERCALL_REP_START_MASK;
+                control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
+
+                touch_nmi_watchdog();
+        } while (rep_comp < rep_count);
+
+        return status;
+}
+
 void hyperv_init(void);
 void hyperv_report_panic(struct pt_regs *regs);
 bool hv_is_hypercall_page_setup(void);