[PATCH 02/23] KVM: PPC: Book3S HV: Endian fix for accessing VPA yield count
The VPA (virtual processor area) is defined by PAPR and is therefore big-endian, so we need a be32_to_cpu when reading it in kvmppc_get_yield_count(). Without this, H_CONFER always fails on a little-endian host, causing SMP guests to waste time spinning on spinlocks. Cc: sta...@vger.kernel.org # v3.19 Signed-off-by: Paul Mackerras pau...@samba.org --- arch/powerpc/kvm/book3s_hv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index b273193..de74756 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -636,7 +636,7 @@ static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) spin_lock(vcpu-arch.vpa_update_lock); lppaca = (struct lppaca *)vcpu-arch.vpa.pinned_addr; if (lppaca) - yield_count = lppaca-yield_count; + yield_count = be32_to_cpu(lppaca-yield_count); spin_unlock(vcpu-arch.vpa_update_lock); return yield_count; } -- 2.1.4 -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
[PATCH 02/23] KVM: PPC: Book3S HV: Endian fix for accessing VPA yield count
The VPA (virtual processor area) is defined by PAPR and is therefore big-endian, so we need a be32_to_cpu when reading it in kvmppc_get_yield_count(). Without this, H_CONFER always fails on a little-endian host, causing SMP guests to waste time spinning on spinlocks. Cc: sta...@vger.kernel.org # v3.19 Signed-off-by: Paul Mackerras pau...@samba.org --- arch/powerpc/kvm/book3s_hv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index b273193..de74756 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -636,7 +636,7 @@ static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) spin_lock(vcpu-arch.vpa_update_lock); lppaca = (struct lppaca *)vcpu-arch.vpa.pinned_addr; if (lppaca) - yield_count = lppaca-yield_count; + yield_count = be32_to_cpu(lppaca-yield_count); spin_unlock(vcpu-arch.vpa_update_lock); return yield_count; } -- 2.1.4 -- To unsubscribe from this list: send the line unsubscribe kvm-ppc in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
