diff options
| author | Greg Kurz <groug@kaod.org> | 2017-11-13 20:42:39 +0100 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2017-11-14 11:12:42 +1100 |
| commit | dcb556fc6ad879f7d29fb233a273a1ea3aa0549c (patch) | |
| tree | abb2d4d950e9ae5676991aa5552cc063e9ec398c /hw/intc/xics_kvm.c | |
| parent | e05fba5004676cd0fa7c47b623cb0a14ad1feed8 (diff) | |
| download | qemu-dcb556fc6ad879f7d29fb233a273a1ea3aa0549c.zip | |
xics/kvm: synchonize state before 'info pic'
When using the emulated XICS, the 'info pic' monitor command shows:
CPU 0 XIRR=ff000000 ((nil)) PP=ff MFRR=ff
ICS 1000..13ff 0x10040060340
1000 MSI 05 00
1001 MSI 05 00
1002 MSI 05 00
1003 MSI ff 00
1004 LSI ff 00
1005 LSI ff 00
1006 LSI ff 00
1007 LSI ff 00
1008 MSI 05 00
1009 MSI 05 00
100a MSI 05 00
100b MSI 05 00
100c MSI 05 00
but when using the in-kernel XICS with the very same guest, we get:
CPU 0 XIRR=00000000 ((nil)) PP=ff MFRR=ff
ICS 1000..13ff 0x10032e00340
1000 MSI ff 00
1001 MSI ff 00
1002 MSI ff 00
1003 MSI ff 00
1004 LSI ff 00
1005 LSI ff 00
1006 LSI ff 00
1007 LSI ff 00
1008 MSI ff 00
1009 MSI ff 00
100a MSI ff 00
100b MSI ff 00
100c MSI ff 00
ie, all irqs are masked and XIRR is null, while we should get the
same output as with the emulated XICS.
If the guest is then migrated, 'info pic' shows the expected values
on both source and destination.
The problem is that QEMU doesn't synchronize with KVM before printing
the XICS state. Migration happens to fix the output because it enforces
synchronization with KVM.
To fix the invalid output of 'info pic', this patch introduces a new
synchronize_state operation for both ICPStateClass and ICSStateClass.
The ICP operation relies on run_on_cpu() in order to kick the vCPU
and avoid sleeping on KVM_GET_ONE_REG.
Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'hw/intc/xics_kvm.c')
| -rw-r--r-- | hw/intc/xics_kvm.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c index 3091ad3ac2..89fb20e2c5 100644 --- a/hw/intc/xics_kvm.c +++ b/hw/intc/xics_kvm.c @@ -81,6 +81,18 @@ static void icp_get_kvm_state(ICPState *icp) & KVM_REG_PPC_ICP_PPRI_MASK; } +static void do_icp_synchronize_state(CPUState *cpu, run_on_cpu_data arg) +{ + icp_get_kvm_state(arg.host_ptr); +} + +static void icp_synchronize_state(ICPState *icp) +{ + if (icp->cs) { + run_on_cpu(icp->cs, do_icp_synchronize_state, RUN_ON_CPU_HOST_PTR(icp)); + } +} + static int icp_set_kvm_state(ICPState *icp, int version_id) { uint64_t state; @@ -156,6 +168,7 @@ static void icp_kvm_class_init(ObjectClass *klass, void *data) icpc->post_load = icp_set_kvm_state; icpc->realize = icp_kvm_realize; icpc->reset = icp_kvm_reset; + icpc->synchronize_state = icp_synchronize_state; } static const TypeInfo icp_kvm_info = { @@ -234,6 +247,11 @@ static void ics_get_kvm_state(ICSState *ics) } } +static void ics_synchronize_state(ICSState *ics) +{ + ics_get_kvm_state(ics); +} + static int ics_set_kvm_state(ICSState *ics, int version_id) { uint64_t state; @@ -347,6 +365,7 @@ static void ics_kvm_class_init(ObjectClass *klass, void *data) icsc->realize = ics_kvm_realize; icsc->pre_save = ics_get_kvm_state; icsc->post_load = ics_set_kvm_state; + icsc->synchronize_state = ics_synchronize_state; } static const TypeInfo ics_kvm_info = { |