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authorJames Hogan <james.hogan@imgtec.com>2016-06-09 14:19:14 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2016-06-14 11:02:44 +0200
commit878edf014e29de38c49153aba20273fbc9ae31af (patch)
tree0ea5871f8a035389da5aa423e72a0a58f2033473 /arch/mips/kernel/asm-offsets.c
parent26ee17ff71d3def831bfa4f6851ed1ba789e24f6 (diff)
downloadop-kernel-dev-878edf014e29de38c49153aba20273fbc9ae31af.zip
op-kernel-dev-878edf014e29de38c49153aba20273fbc9ae31af.tar.gz
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/kernel/asm-offsets.c')
-rw-r--r--arch/mips/kernel/asm-offsets.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index 4208088..a1263d1 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -355,7 +355,6 @@ void output_kvm_defines(void)
OFFSET(VCPU_RUN, kvm_vcpu, run);
OFFSET(VCPU_HOST_ARCH, kvm_vcpu, arch);
- OFFSET(VCPU_HOST_EBASE, kvm_vcpu_arch, host_ebase);
OFFSET(VCPU_GUEST_EBASE, kvm_vcpu_arch, guest_ebase);
OFFSET(VCPU_HOST_STACK, kvm_vcpu_arch, host_stack);
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