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| author | James Hogan <james.hogan@imgtec.com> | 2016-06-09 14:19:14 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-06-14 11:02:44 +0200 |
| commit | 878edf014e29de38c49153aba20273fbc9ae31af (patch) | |
| tree | 0ea5871f8a035389da5aa423e72a0a58f2033473 /arch/mips/kvm/mips.c | |
| parent | 26ee17ff71d3def831bfa4f6851ed1ba789e24f6 (diff) | |
| download | talos-obmc-linux-878edf014e29de38c49153aba20273fbc9ae31af.tar.gz talos-obmc-linux-878edf014e29de38c49153aba20273fbc9ae31af.zip | |
MIPS: KVM: Restore host EBase from ebase variable
The host kernel's exception vector base address is currently saved in
the VCPU structure at creation time, and restored on a guest exit.
However it doesn't change and can already be easily accessed from the
'ebase' variable (arch/mips/kernel/traps.c), so drop the host_ebase
member of kvm_vcpu_arch, export the 'ebase' variable to modules and load
from there instead.
This does result in a single extra instruction (lui) on the guest exit
path, but simplifies the code a bit and removes the redundant storage of
the host exception base address.
Credit for the idea goes to Cavium's VZ KVM implementation.
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/mips/kvm/mips.c')
| -rw-r--r-- | arch/mips/kvm/mips.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c index c1ab6110ca1d..6e753761b5d6 100644 --- a/arch/mips/kvm/mips.c +++ b/arch/mips/kvm/mips.c @@ -273,9 +273,6 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) else size = 0x4000; - /* Save Linux EBASE */ - vcpu->arch.host_ebase = (void *)read_c0_ebase(); - gebase = kzalloc(ALIGN(size, PAGE_SIZE), GFP_KERNEL); if (!gebase) { |
