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| author | Paolo Bonzini <pbonzini@redhat.com> | 2020-01-09 09:57:19 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-01-27 19:59:54 +0100 |
| commit | 7495e22bb165e7030bae4d9c6e84addb5ea17b29 (patch) | |
| tree | 0cf3387b85de84951f24406d12e9cac6407fa155 /virt/kvm/arm/perf.c | |
| parent | 6a3c623ba8a842f895e80a7fa0feb94b7b4368f2 (diff) | |
| download | linux-7495e22bb165e7030bae4d9c6e84addb5ea17b29.tar.bz2 | |
KVM: Move running VCPU from ARM to common code
For ring-based dirty log tracking, it will be more efficient to account
writes during schedule-out or schedule-in to the currently running VCPU.
We would like to do it even if the write doesn't use the current VCPU's
address space, as is the case for cached writes (see commit 4e335d9e7ddb,
"Revert "KVM: Support vCPU-based gfn->hva cache"", 2017-05-02).
Therefore, add a mechanism to track the currently-loaded kvm_vcpu struct.
There is already something similar in KVM/ARM; one important difference
is that kvm_arch_vcpu_{load,put} have two callers in virt/kvm/kvm_main.c:
we have to update both the architecture-independent vcpu_{load,put} and
the preempt notifiers.
Another change made in the process is to allow using kvm_get_running_vcpu()
in preemptible code. This is allowed because preempt notifiers ensure
that the value does not change even after the VCPU thread is migrated.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/arm/perf.c')
| -rw-r--r-- | virt/kvm/arm/perf.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/virt/kvm/arm/perf.c b/virt/kvm/arm/perf.c index 918cdc3839ea..d45b8b9a4415 100644 --- a/virt/kvm/arm/perf.c +++ b/virt/kvm/arm/perf.c @@ -13,14 +13,14 @@ static int kvm_is_in_guest(void) { - return kvm_arm_get_running_vcpu() != NULL; + return kvm_get_running_vcpu() != NULL; } static int kvm_is_user_mode(void) { struct kvm_vcpu *vcpu; - vcpu = kvm_arm_get_running_vcpu(); + vcpu = kvm_get_running_vcpu(); if (vcpu) return !vcpu_mode_priv(vcpu); @@ -32,7 +32,7 @@ static unsigned long kvm_get_guest_ip(void) { struct kvm_vcpu *vcpu; - vcpu = kvm_arm_get_running_vcpu(); + vcpu = kvm_get_running_vcpu(); if (vcpu) return *vcpu_pc(vcpu); |