On 07/03/2013 07:42:36 AM, Mihai Caraman wrote:
Increase FPU laziness by calling kvmppc_load_guest_fp() just before
returning to guest instead of each sched in. Without this improvement
an interrupt may also claim floting point corrupting guest state.
Signed-off-by: Mihai Caraman <mihai.cara...@freescale.com>
---
arch/powerpc/kvm/booke.c | 1 +
arch/powerpc/kvm/e500mc.c | 2 --
2 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 113961f..3cae2e3 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -1204,6 +1204,7 @@ int kvmppc_handle_exit(struct kvm_run *run,
struct kvm_vcpu *vcpu,
r = (s << 2) | RESUME_HOST | (r &
RESUME_FLAG_NV);
} else {
kvmppc_lazy_ee_enable();
+ kvmppc_load_guest_fp(vcpu);
}
}
diff --git a/arch/powerpc/kvm/e500mc.c b/arch/powerpc/kvm/e500mc.c
index 19c8379..09da1ac 100644
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -143,8 +143,6 @@ void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu,
int cpu)
kvmppc_e500_tlbil_all(vcpu_e500);
__get_cpu_var(last_vcpu_on_cpu) = vcpu;
}
-
- kvmppc_load_guest_fp(vcpu);
}
void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
Can we now remove vcpu->fpu_active, and the comment that says "Kernel
usage of FP (via
enable_kernel_fp()) in this thread must not occur while
vcpu->fpu_active is set."?
-Scott
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