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authorDavid Gibson <david@gibson.dropbear.id.au>2011-09-29 21:39:12 +0000
committerAlexander Graf <agraf@suse.de>2011-10-30 17:11:53 +0100
commit0f5cb2989f33059a70e8da335b62af5f27fabbe2 (patch)
treedc8112aaca1611eb9bb733421be27f5947bfcb6d /target-ppc/kvm_ppc.h
parent354ac20a36a82a5ee09b0a6c8ba8655358a7597f (diff)
pseries: Use Book3S-HV TCE acceleration capabilities
The pseries machine of qemu implements the TCE mechanism used as a virtual IOMMU for the PAPR defined virtual IO devices. Because the PAPR spec only defines a small DMA address space, the guest VIO drivers need to update TCE mappings very frequently - the virtual network device is particularly bad. This means many slow exits to qemu to emulate the H_PUT_TCE hypercall. Sufficiently recent kernels allow this to be mitigated by implementing H_PUT_TCE in the host kernel. To make use of this, however, qemu needs to initialize the necessary TCE tables, and map them into itself so that the VIO device implementations can retrieve the mappings when they access guest memory (which is treated as a virtual DMA operation). This patch adds the necessary calls to use the KVM TCE acceleration. If the kernel does not support acceleration, or there is some other error creating the accelerated TCE table, then it will still fall back to full userspace TCE implementation. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/kvm_ppc.h')
-rw-r--r--target-ppc/kvm_ppc.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h
index 82f32f449e..87d1bdd5fd 100644
--- a/target-ppc/kvm_ppc.h
+++ b/target-ppc/kvm_ppc.h
@@ -22,6 +22,8 @@ int kvmppc_set_interrupt(CPUState *env, int irq, int level);
void kvmppc_set_papr(CPUState *env);
int kvmppc_smt_threads(void);
off_t kvmppc_alloc_rma(const char *name, MemoryRegion *sysmem);
+void *kvmppc_create_spapr_tce(uint32_t liobn, uint32_t window_size, int *pfd);
+int kvmppc_remove_spapr_tce(void *table, int pfd, uint32_t window_size);
#else
@@ -59,6 +61,18 @@ static inline off_t kvmppc_alloc_rma(const char *name, MemoryRegion *sysmem)
return 0;
}
+static inline void *kvmppc_create_spapr_tce(uint32_t liobn,
+ uint32_t window_size, int *fd)
+{
+ return NULL;
+}
+
+static inline int kvmppc_remove_spapr_tce(void *table, int pfd,
+ uint32_t window_size)
+{
+ return -1;
+}
+
#endif
#ifndef CONFIG_KVM