[PATCH v2] xen/vcpu: ignore VCPU_SSHOTTMR_future

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

The usage of VCPU_SSHOTTMR_future in Linux prior to 4.7 is bogus.
When the hypervisor returns -ENOTIME (timeout in the past) Linux keeps
retrying to setup the timer with a higher timeout instead of
self-injecting a timer interrupt.

On boxes without any hardware assistance for logdirty we have seen HVM
Linux guests < 4.7 with 32vCPUs give up trying to setup the timer when
logdirty is enabled:

CE: Reprogramming failure. Giving up
CE: xen increased min_delta_ns to 1000000 nsec
CE: Reprogramming failure. Giving up
CE: Reprogramming failure. Giving up
CE: xen increased min_delta_ns to 506250 nsec
CE: xen increased min_delta_ns to 759375 nsec
CE: xen increased min_delta_ns to 1000000 nsec
CE: Reprogramming failure. Giving up
CE: Reprogramming failure. Giving up
CE: Reprogramming failure. Giving up
Freezing user space processes ...
INFO: rcu_sched detected stalls on CPUs/tasks: { 14} (detected by 10, t=60002 
jiffies, g=4006, c=4005, q=14130)
Task dump for CPU 14:
swapper/14      R  running task        0     0      1 0x00000000
Call Trace:
 [<ffffffff90160f5d>] ? rcu_eqs_enter_common.isra.30+0x3d/0xf0
 [<ffffffff907b9bde>] ? default_idle+0x1e/0xd0
 [<ffffffff90039570>] ? arch_cpu_idle+0x20/0xc0
 [<ffffffff9010820a>] ? cpu_startup_entry+0x14a/0x1e0
 [<ffffffff9005d3a7>] ? start_secondary+0x1f7/0x270
 [<ffffffff900000d5>] ? start_cpu+0x5/0x14
INFO: rcu_sched detected stalls on CPUs/tasks: { 26} (detected by 24, t=60002 
jiffies, g=6922, c=6921, q=7013)
Task dump for CPU 26:
swapper/26      R  running task        0     0      1 0x00000000
Call Trace:
 [<ffffffff90160f5d>] ? rcu_eqs_enter_common.isra.30+0x3d/0xf0
 [<ffffffff907b9bde>] ? default_idle+0x1e/0xd0
 [<ffffffff90039570>] ? arch_cpu_idle+0x20/0xc0
 [<ffffffff9010820a>] ? cpu_startup_entry+0x14a/0x1e0
 [<ffffffff9005d3a7>] ? start_secondary+0x1f7/0x270
 [<ffffffff900000d5>] ? start_cpu+0x5/0x14
INFO: rcu_sched detected stalls on CPUs/tasks: { 26} (detected by 24, t=60002 
jiffies, g=8499, c=8498, q=7664)
Task dump for CPU 26:
swapper/26      R  running task        0     0      1 0x00000000
Call Trace:
 [<ffffffff90160f5d>] ? rcu_eqs_enter_common.isra.30+0x3d/0xf0
 [<ffffffff907b9bde>] ? default_idle+0x1e/0xd0
 [<ffffffff90039570>] ? arch_cpu_idle+0x20/0xc0
 [<ffffffff9010820a>] ? cpu_startup_entry+0x14a/0x1e0
 [<ffffffff9005d3a7>] ? start_secondary+0x1f7/0x270
 [<ffffffff900000d5>] ? start_cpu+0x5/0x14

Thus leading to CPU stalls and a broken system as a result.

Workaround this bogus usage by ignoring the VCPU_SSHOTTMR_future in
the hypervisor.  Old Linux versions are the only ones known to have
(wrongly) attempted to use the flag, and ignoring it is compatible
with the behavior expected by any guests setting that flag.

Note the usage of the flag has been removed from Linux by commit:

c06b6d70feb3 xen/x86: don't lose event interrupts

Which landed in Linux 4.7.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Changes since v1:
 - Just ignore the flag, as there's no ABI breakage.
---
 CHANGELOG.md              |  2 ++
 xen/common/domain.c       | 13 ++++++++++---
 xen/include/public/vcpu.h |  2 +-
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5dbf8b06d72c..ffe009af2dc8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ The format is based on [Keep a 
Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Changed
  - Repurpose command line gnttab_max_{maptrack_,}frames options so they don't
    cap toolstack provided values.
+ - Ignore VCPU_SSHOTTMR_future VCPUOP_set_singleshot_timer flag. The only
+   known user doesn't use it properly, leading to in-guest breakage.
 
 ### Added
  - On x86, support for features new in Intel Sapphire Rapids CPUs:
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 626debbae095..6a440590fe2a 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1762,9 +1762,16 @@ long common_vcpu_op(int cmd, struct vcpu *v, 
XEN_GUEST_HANDLE_PARAM(void) arg)
         if ( copy_from_guest(&set, arg, 1) )
             return -EFAULT;
 
-        if ( (set.flags & VCPU_SSHOTTMR_future) &&
-             (set.timeout_abs_ns < NOW()) )
-            return -ETIME;
+        if ( set.timeout_abs_ns < NOW() )
+        {
+            /*
+             * Simplify the logic if the timeout has already expired and just
+             * inject the event.
+             */
+            stop_timer(&v->singleshot_timer);
+            send_timer_event(v);
+            break;
+        }
 
         migrate_timer(&v->singleshot_timer, smp_processor_id());
         set_timer(&v->singleshot_timer, set.timeout_abs_ns);
diff --git a/xen/include/public/vcpu.h b/xen/include/public/vcpu.h
index 81a3b3a7438c..30b5291cd447 100644
--- a/xen/include/public/vcpu.h
+++ b/xen/include/public/vcpu.h
@@ -150,7 +150,7 @@ typedef struct vcpu_set_singleshot_timer 
vcpu_set_singleshot_timer_t;
 DEFINE_XEN_GUEST_HANDLE(vcpu_set_singleshot_timer_t);
 
 /* Flags to VCPUOP_set_singleshot_timer. */
- /* Require the timeout to be in the future (return -ETIME if it's passed). */
+ /* Ignored. */
 #define _VCPU_SSHOTTMR_future (0)
 #define VCPU_SSHOTTMR_future  (1U << _VCPU_SSHOTTMR_future)
 
-- 
2.40.0