| Message ID | fb64116eb0795e0b2b0789a02b4ce8f694fc69e4.1467783317.git.sam.bobroff@au1.ibm.com |
|---|---|
| State | New |
| Headers | show |
On Wed, Jul 06, 2016 at 03:35:23PM +1000, Sam Bobroff wrote: > Advertise HTM support in ibm, pa-features if KVM indicates support when > queried via a new capability (KVM_CAP_PPC_HTM). > > If KVM returns false for the capability (which may indicate that the > host kernel doesn't support the capability itself) attempt to > determine availability using a fallback method based on KVM being > KVM-HV and HTM being available to the QEMU process. > > Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> > --- > v2: > > * Improve readability of HTM bit set code. > * Move the test for KVM into kvmppc_get_htm_support(). > > hw/ppc/spapr.c | 3 +++ > target-ppc/kvm.c | 29 +++++++++++++++++++++++++++++ > target-ppc/kvm_ppc.h | 6 ++++++ > 3 files changed, 38 insertions(+) > > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c > index 704aae7..843fbe7 100644 > --- a/hw/ppc/spapr.c > +++ b/hw/ppc/spapr.c > @@ -712,6 +712,9 @@ static void spapr_populate_cpu_dt(CPUState *cs, void *fdt, int offset, > } else /* env->mmu_model == POWERPC_MMU_2_07 */ { > pa_features = pa_features_207; > pa_size = sizeof(pa_features_207); > + if (kvmppc_get_htm_support(env)) { > + pa_features[24] |= 0x80; > + } > } > if (env->ci_large_pages) { > pa_features[3] |= 0x20; > diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c > index 884d564..9d13446 100644 > --- a/target-ppc/kvm.c > +++ b/target-ppc/kvm.c > @@ -20,6 +20,7 @@ > #include <sys/vfs.h> > > #include <linux/kvm.h> > +#include "elf.h" > > #include "qemu-common.h" > #include "qemu/error-report.h" > @@ -1976,6 +1977,34 @@ uint32_t kvmppc_get_dfp(void) > return kvmppc_read_int_cpu_dt("ibm,dfp"); > } > > +bool kvmppc_get_htm_support(CPUPPCState *env) > +{ > + PowerPCCPU *cpu = ppc_env_get_cpu(env); > + CPUState *cs = CPU(cpu); > + > + if (!kvm_enabled()) { > + return false; > + } > + if (kvm_vm_check_extension(cs->kvm_state, KVM_CAP_PPC_HTM)) { > + return true; > + } > + /* > + * Fallback test for host kernels that don't yet support KVM_CAP_PPC_HTM. > + * This will be unnecessary when KVM_API_VERSION is incremented (to 13 or > + * above) because that will remove the ambiguity between the host kernel > + * lacking support for KVM_CAP_PPC_HTM and it having support but reporting > + * HTM as unavailable (both of which return 0, above). > + */ > + if (kvm_vm_check_extension(cs->kvm_state, KVM_CAP_PPC_GET_PVINFO)) { > + /* Assume this means PR KVM, so no TM. */ > + return false; > + } else { > + /* Assume this means HV KVM, propagate whatever host userspace sees. */ > + unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2); > + return !!(hwcap2 & PPC_FEATURE2_HAS_HTM); > + } > +} > + > static int kvmppc_get_pvinfo(CPUPPCState *env, struct kvm_ppc_pvinfo *pvinfo) > { > PowerPCCPU *cpu = ppc_env_get_cpu(env); > diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h > index 20bfb59..b01c717 100644 > --- a/target-ppc/kvm_ppc.h > +++ b/target-ppc/kvm_ppc.h > @@ -17,6 +17,7 @@ uint32_t kvmppc_get_tbfreq(void); > uint64_t kvmppc_get_clockfreq(void); > uint32_t kvmppc_get_vmx(void); > uint32_t kvmppc_get_dfp(void); > +bool kvmppc_get_htm_support(CPUPPCState *env); > bool kvmppc_get_host_model(char **buf); > bool kvmppc_get_host_serial(char **buf); > int kvmppc_get_hasidle(CPUPPCState *env); > @@ -90,6 +91,11 @@ static inline uint32_t kvmppc_get_dfp(void) > return 0; > } > > +static inline bool kvmppc_get_htm_support(KVMState *kvm_state) > +{ > + return false; > +} > + > static inline int kvmppc_get_hasidle(CPUPPCState *env) > { > return 0;
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 704aae7..843fbe7 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -712,6 +712,9 @@ static void spapr_populate_cpu_dt(CPUState *cs, void *fdt, int offset, } else /* env->mmu_model == POWERPC_MMU_2_07 */ { pa_features = pa_features_207; pa_size = sizeof(pa_features_207); + if (kvmppc_get_htm_support(env)) { + pa_features[24] |= 0x80; + } } if (env->ci_large_pages) { pa_features[3] |= 0x20; diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c index 884d564..9d13446 100644 --- a/target-ppc/kvm.c +++ b/target-ppc/kvm.c @@ -20,6 +20,7 @@ #include <sys/vfs.h> #include <linux/kvm.h> +#include "elf.h" #include "qemu-common.h" #include "qemu/error-report.h" @@ -1976,6 +1977,34 @@ uint32_t kvmppc_get_dfp(void) return kvmppc_read_int_cpu_dt("ibm,dfp"); } +bool kvmppc_get_htm_support(CPUPPCState *env) +{ + PowerPCCPU *cpu = ppc_env_get_cpu(env); + CPUState *cs = CPU(cpu); + + if (!kvm_enabled()) { + return false; + } + if (kvm_vm_check_extension(cs->kvm_state, KVM_CAP_PPC_HTM)) { + return true; + } + /* + * Fallback test for host kernels that don't yet support KVM_CAP_PPC_HTM. + * This will be unnecessary when KVM_API_VERSION is incremented (to 13 or + * above) because that will remove the ambiguity between the host kernel + * lacking support for KVM_CAP_PPC_HTM and it having support but reporting + * HTM as unavailable (both of which return 0, above). + */ + if (kvm_vm_check_extension(cs->kvm_state, KVM_CAP_PPC_GET_PVINFO)) { + /* Assume this means PR KVM, so no TM. */ + return false; + } else { + /* Assume this means HV KVM, propagate whatever host userspace sees. */ + unsigned long hwcap2 = qemu_getauxval(AT_HWCAP2); + return !!(hwcap2 & PPC_FEATURE2_HAS_HTM); + } +} + static int kvmppc_get_pvinfo(CPUPPCState *env, struct kvm_ppc_pvinfo *pvinfo) { PowerPCCPU *cpu = ppc_env_get_cpu(env); diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h index 20bfb59..b01c717 100644 --- a/target-ppc/kvm_ppc.h +++ b/target-ppc/kvm_ppc.h @@ -17,6 +17,7 @@ uint32_t kvmppc_get_tbfreq(void); uint64_t kvmppc_get_clockfreq(void); uint32_t kvmppc_get_vmx(void); uint32_t kvmppc_get_dfp(void); +bool kvmppc_get_htm_support(CPUPPCState *env); bool kvmppc_get_host_model(char **buf); bool kvmppc_get_host_serial(char **buf); int kvmppc_get_hasidle(CPUPPCState *env); @@ -90,6 +91,11 @@ static inline uint32_t kvmppc_get_dfp(void) return 0; } +static inline bool kvmppc_get_htm_support(KVMState *kvm_state) +{ + return false; +} + static inline int kvmppc_get_hasidle(CPUPPCState *env) { return 0;
Advertise HTM support in ibm, pa-features if KVM indicates support when queried via a new capability (KVM_CAP_PPC_HTM). If KVM returns false for the capability (which may indicate that the host kernel doesn't support the capability itself) attempt to determine availability using a fallback method based on KVM being KVM-HV and HTM being available to the QEMU process. Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com> --- v2: * Improve readability of HTM bit set code. * Move the test for KVM into kvmppc_get_htm_support(). hw/ppc/spapr.c | 3 +++ target-ppc/kvm.c | 29 +++++++++++++++++++++++++++++ target-ppc/kvm_ppc.h | 6 ++++++ 3 files changed, 38 insertions(+)