[PATCH v4 13/23] arm64: KVM: VHE: Enable minimal sysreg save/restore
From: Marc Zyngier <hidden>
Date: 2016-02-11 18:40:33
Also in:
kvm, kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
We're now in a position where we can introduce VHE's minimal save/restore, which is limited to the handful of shared sysregs. Add the required alternative function calls that result in a "do nothing" call on VHE, and the normal save/restore for non-VHE. Reviewed-by: Christoffer Dall <redacted> Signed-off-by: Marc Zyngier <redacted> --- arch/arm64/kvm/hyp/sysreg-sr.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kvm/hyp/sysreg-sr.c b/arch/arm64/kvm/hyp/sysreg-sr.c
index 7d7d757..74b5f81 100644
--- a/arch/arm64/kvm/hyp/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/sysreg-sr.c@@ -23,6 +23,9 @@ #include "hyp.h" +/* Yes, this does nothing, on purpose */ +static void __hyp_text __sysreg_do_nothing(struct kvm_cpu_context *ctxt) { } + /* * Non-VHE: Both host and guest must save everything. *
@@ -67,9 +70,13 @@ static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt) ctxt->gp_regs.spsr[KVM_SPSR_EL1]= read_sysreg_el1(spsr); } +static hyp_alternate_select(__sysreg_call_save_host_state, + __sysreg_save_state, __sysreg_do_nothing, + ARM64_HAS_VIRT_HOST_EXTN); + void __hyp_text __sysreg_save_host_state(struct kvm_cpu_context *ctxt) { - __sysreg_save_state(ctxt); + __sysreg_call_save_host_state()(ctxt); __sysreg_save_common_state(ctxt); }
@@ -116,9 +123,13 @@ static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt) write_sysreg_el1(ctxt->gp_regs.spsr[KVM_SPSR_EL1],spsr); } +static hyp_alternate_select(__sysreg_call_restore_host_state, + __sysreg_restore_state, __sysreg_do_nothing, + ARM64_HAS_VIRT_HOST_EXTN); + void __hyp_text __sysreg_restore_host_state(struct kvm_cpu_context *ctxt) { - __sysreg_restore_state(ctxt); + __sysreg_call_restore_host_state()(ctxt); __sysreg_restore_common_state(ctxt); }
--
2.1.4