motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-08 02:03:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

pseries: Support SMT systems for KVM Book3S-HV

Browse source 
Alex Graf has already made qemu support KVM for the pseries machine
when using the Book3S-PR KVM variant (which runs the guest in
usermode, emulating supervisor operations).  This code allows gets us
very close to also working with KVM Book3S-HV (using the hypervisor
capabilities of recent POWER CPUs).

This patch moves us another step towards Book3S-HV support by
correctly handling SMT (multithreaded) POWER CPUs.  There are two
parts to this:

 * Querying KVM to check SMT capability, and if present, adjusting the
   cpu numbers that qemu assigns to cause KVM to assign guest threads
   to cores in the right way (this isn't automatic, because the POWER
   HV support has a limitation that different threads on a single core
   cannot be in different guests at the same time).

 * Correctly informing the guest OS of the SMT thread to core mappings
   via the device tree.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
David Gibson 2011-09-29 21:39:10 +00:00 • committed by Alexander Graf
parent eeae2e7b52
commit e97c363638
4 changed files with 46 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

8
target-ppc/kvm.c
View file

@ -28,6 +28,7 @@
#include "kvm_ppc.h"
#include "cpu.h"
#include "device_tree.h"
#include "hw/spapr.h"
#include "hw/sysbus.h"
#include "hw/spapr.h"
@ -53,6 +54,7 @@ static int cap_interrupt_unset = false;
static int cap_interrupt_level = false;
static int cap_segstate;
static int cap_booke_sregs;
static int cap_ppc_smt;
/* XXX We have a race condition where we actually have a level triggered
* interrupt, but the infrastructure can't expose that yet, so the guest
@ -76,6 +78,7 @@ int kvm_arch_init(KVMState *s)
cap_interrupt_level = kvm_check_extension(s, KVM_CAP_PPC_IRQ_LEVEL);
cap_segstate = kvm_check_extension(s, KVM_CAP_PPC_SEGSTATE);
cap_booke_sregs = kvm_check_extension(s, KVM_CAP_PPC_BOOKE_SREGS);
cap_ppc_smt = kvm_check_extension(s, KVM_CAP_PPC_SMT);
if (!cap_interrupt_level) {
fprintf(stderr, "KVM: Couldn't find level irq capability. Expect the "
@ -750,6 +753,11 @@ fail:
cpu_abort(env, "This KVM version does not support PAPR\n");
}
int kvmppc_smt_threads(void)
{
return cap_ppc_smt ? cap_ppc_smt : 1;
}
bool kvm_arch_stop_on_emulation_error(CPUState *env)
{
return true;