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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>
hifive-unleashed-5.1
Paul Mackerras 2018-07-26 14:53:54 +10:00
parent 1e175d2e07
commit 1ebe6b81eb
1 changed files with 8 additions and 1 deletions
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9
arch/powerpc/include/asm/kvm_host.h
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@ -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