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| author | Paul Mackerras <paulus@ozlabs.org> | 2018-07-26 07:53:54 +0300 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2018-07-26 07:53:54 +0300 |
| commit | 1ebe6b81ebdba8faf377d1d7d84ad9368e7a0bae (patch) | |
| tree | 79230eb977a85adf77f6b55e083043f9e594344e /arch | |
| parent | 1e175d2e07c71d9574f5b1c74523abca54e2654f (diff) | |
| download | linux-1ebe6b81ebdba8faf377d1d7d84ad9368e7a0bae.tar.xz | |
KVM: PPC: Book3S HV: Allow creating max number of VCPUs on POWER9
Commit 1e175d2 ("KVM: PPC: Book3S HV: Pack VCORE IDs to access full
VCPU ID space", 2018-07-25) allowed use of VCPU IDs up to
KVM_MAX_VCPU_ID on POWER9 in all guest SMT modes and guest emulated
hardware SMT modes. However, with the current definition of
KVM_MAX_VCPU_ID, a guest SMT mode of 1 and an emulated SMT mode of 8,
it is only possible to create KVM_MAX_VCPUS / 2 VCPUS, because
threads_per_subcore is 4 on POWER9 CPUs. (Using an emulated SMT mode
of 8 is useful when migrating VMs to or from POWER8 hosts.)
This increases KVM_MAX_VCPU_ID to 8 * KVM_MAX_VCPUS when HV KVM is
configured in, so that a full complement of KVM_MAX_VCPUS VCPUs can
be created on POWER9 in all guest SMT modes and emulated hardware
SMT modes.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_host.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index 5b9e6608c5bf..906bcbdfd2a1 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -42,7 +42,14 @@ #define KVM_USER_MEM_SLOTS 512 #include <asm/cputhreads.h> -#define KVM_MAX_VCPU_ID (threads_per_subcore * KVM_MAX_VCORES) + +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE +#include <asm/kvm_book3s_asm.h> /* for MAX_SMT_THREADS */ +#define KVM_MAX_VCPU_ID (MAX_SMT_THREADS * KVM_MAX_VCORES) + +#else +#define KVM_MAX_VCPU_ID KVM_MAX_VCPUS +#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */ #define __KVM_HAVE_ARCH_INTC_INITIALIZED |