On Tue, Feb 19, 2013 at 06:43:35PM +1100, Alexey Kardashevskiy wrote:
Currently only single TCE entry per requiest is supported (H_PUT_TCE).
However PAPR+ specification allows multiple entry requests such as
H_PUT_TCE_INDIRECT and H_STUFFF_TCE. Having less transitions to the host
kernel via ioctls, support of these calls can accelerate IOMMU operations.
The patch adds a check for the KVM_CAP_PPC_MULTITCE capability and
if it is supported, QEMU adds the "call-multi-tce" property to hypertas
list which triggers the guest to use H_PUT_TCE_INDIRECT and H_STUFF_TCE
instead of H_PUT_TCE.
Signed-off-by: Alexey Kardashevskiy <address@hidden>
Conflicts:
hw/spapr_iommu.c
linux-headers/linux/kvm.h
Try to remember to remove the conflict messages before you send out.
---
hw/spapr.c | 12 ++++++--
hw/spapr_iommu.c | 71 +++++++++++++++++++++++++++++++++++++++++++++
linux-headers/linux/kvm.h | 1 +
3 files changed, 82 insertions(+), 2 deletions(-)
diff --git a/hw/spapr.c b/hw/spapr.c
index 2ec0cd0..231a7b6 100644
--- a/hw/spapr.c
+++ b/hw/spapr.c
@@ -233,6 +233,9 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
CPUPPCState *env;
uint32_t start_prop = cpu_to_be32(initrd_base);
uint32_t end_prop = cpu_to_be32(initrd_base + initrd_size);
+ char hypertas_propm[] =
"hcall-pft\0hcall-term\0hcall-dabr\0hcall-interrupt"
+ "\0hcall-tce\0hcall-vio\0hcall-splpar\0hcall-bulk"
+ "\0hcall-multi-tce";
char hypertas_prop[] =
"hcall-pft\0hcall-term\0hcall-dabr\0hcall-interrupt"
"\0hcall-tce\0hcall-vio\0hcall-splpar\0hcall-bulk";
char qemu_hypertas_prop[] = "hcall-memop1";
@@ -406,8 +409,13 @@ static void *spapr_create_fdt_skel(const char *cpu_model,
/* RTAS */
_FDT((fdt_begin_node(fdt, "rtas")));
- _FDT((fdt_property(fdt, "ibm,hypertas-functions", hypertas_prop,
- sizeof(hypertas_prop))));
+ if (kvm_check_extension(kvm_state, KVM_CAP_PPC_MULTITCE)) {
+ _FDT((fdt_property(fdt, "ibm,hypertas-functions", hypertas_propm,
+ sizeof(hypertas_propm))));
+ } else {
+ _FDT((fdt_property(fdt, "ibm,hypertas-functions", hypertas_prop,
+ sizeof(hypertas_prop))));
+ }
You've implemented the multitce hypercalls in qemu, but because of the
kvm capability check, you'll never advertise them in full emu.
Instead you should always advertise them as available, and the kvm
capability will just be a question of whether they go fast (through
kvm) or slow (through qemu).