diff options
author | Jan Kiszka <jan.kiszka@siemens.com> | 2010-03-01 19:10:30 +0100 |
---|---|---|
committer | Marcelo Tosatti <mtosatti@redhat.com> | 2010-03-04 00:29:28 -0300 |
commit | ea375f9ab8c76686dca0af8cb4f87a4eb569cad3 (patch) | |
tree | 51e0476453c95a64bd34bc148082ac277a458203 /target-ppc/machine.c | |
parent | b0b1d69079fcb9453f45aade9e9f6b71422147b0 (diff) | |
download | qemu-ea375f9ab8c76686dca0af8cb4f87a4eb569cad3.zip qemu-ea375f9ab8c76686dca0af8cb4f87a4eb569cad3.tar.gz qemu-ea375f9ab8c76686dca0af8cb4f87a4eb569cad3.tar.bz2 |
KVM: Rework VCPU state writeback API
This grand cleanup drops all reset and vmsave/load related
synchronization points in favor of four(!) generic hooks:
- cpu_synchronize_all_states in qemu_savevm_state_complete
(initial sync from kernel before vmsave)
- cpu_synchronize_all_post_init in qemu_loadvm_state
(writeback after vmload)
- cpu_synchronize_all_post_init in main after machine init
- cpu_synchronize_all_post_reset in qemu_system_reset
(writeback after system reset)
These writeback points + the existing one of VCPU exec after
cpu_synchronize_state map on three levels of writeback:
- KVM_PUT_RUNTIME_STATE (during runtime, other VCPUs continue to run)
- KVM_PUT_RESET_STATE (on synchronous system reset, all VCPUs stopped)
- KVM_PUT_FULL_STATE (on init or vmload, all VCPUs stopped as well)
This level is passed to the arch-specific VCPU state writing function
that will decide which concrete substates need to be written. That way,
no writer of load, save or reset functions that interact with in-kernel
KVM states will ever have to worry about synchronization again. That
also means that a lot of reasons for races, segfaults and deadlocks are
eliminated.
cpu_synchronize_state remains untouched, just as Anthony suggested. We
continue to need it before reading or writing of VCPU states that are
also tracked by in-kernel KVM subsystems.
Consequently, this patch removes many cpu_synchronize_state calls that
are now redundant, just like remaining explicit register syncs.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'target-ppc/machine.c')
-rw-r--r-- | target-ppc/machine.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/target-ppc/machine.c b/target-ppc/machine.c index 4897c8a..67de951 100644 --- a/target-ppc/machine.c +++ b/target-ppc/machine.c @@ -7,8 +7,6 @@ void cpu_save(QEMUFile *f, void *opaque) CPUState *env = (CPUState *)opaque; unsigned int i, j; - cpu_synchronize_state(env); - for (i = 0; i < 32; i++) qemu_put_betls(f, &env->gpr[i]); #if !defined(TARGET_PPC64) @@ -96,8 +94,6 @@ int cpu_load(QEMUFile *f, void *opaque, int version_id) CPUState *env = (CPUState *)opaque; unsigned int i, j; - cpu_synchronize_state(env); - for (i = 0; i < 32; i++) qemu_get_betls(f, &env->gpr[i]); #if !defined(TARGET_PPC64) |