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| author | Christoffer Dall | 2017-12-27 21:59:09 +0100 |
|---|---|---|
| committer | Marc Zyngier | 2018-03-19 11:53:18 +0100 |
| commit | a892819560c4985a699486f9c17db065c266d2da (patch) | |
| tree | a1e00ba3e081251125283eb67f7a5aa70707023e /arch/arm64/include/asm/kvm_emulate.h | |
| parent | KVM: arm64: Defer saving/restoring 64-bit sysregs to vcpu load/put on VHE (diff) | |
| download | kernel-qcow2-linux-a892819560c4985a699486f9c17db065c266d2da.tar.gz kernel-qcow2-linux-a892819560c4985a699486f9c17db065c266d2da.tar.xz kernel-qcow2-linux-a892819560c4985a699486f9c17db065c266d2da.zip | |
KVM: arm64: Prepare to handle deferred save/restore of 32-bit registers
32-bit registers are not used by a 64-bit host kernel and can be
deferred, but we need to rework the accesses to these register to access
the latest values depending on whether or not guest system registers are
loaded on the CPU or only reside in memory.
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/kvm_emulate.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_emulate.h | 32 |
1 files changed, 9 insertions, 23 deletions
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h index 6ed18ce0d638..23b33e8ea03a 100644 --- a/arch/arm64/include/asm/kvm_emulate.h +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -33,7 +33,8 @@ #include <asm/virt.h> unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num); -unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu); +unsigned long vcpu_read_spsr32(const struct kvm_vcpu *vcpu); +void vcpu_write_spsr32(struct kvm_vcpu *vcpu, unsigned long v); bool kvm_condition_valid32(const struct kvm_vcpu *vcpu); void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr); @@ -162,41 +163,26 @@ static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num, static inline unsigned long vcpu_read_spsr(const struct kvm_vcpu *vcpu) { - unsigned long *p = (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1]; - - if (vcpu_mode_is_32bit(vcpu)) { - unsigned long *p_32bit = vcpu_spsr32(vcpu); - - /* KVM_SPSR_SVC aliases KVM_SPSR_EL1 */ - if (p_32bit != p) - return *p_32bit; - } + if (vcpu_mode_is_32bit(vcpu)) + return vcpu_read_spsr32(vcpu); if (vcpu->arch.sysregs_loaded_on_cpu) return read_sysreg_el1(spsr); else - return *p; + return vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1]; } -static inline void vcpu_write_spsr(const struct kvm_vcpu *vcpu, unsigned long v) +static inline void vcpu_write_spsr(struct kvm_vcpu *vcpu, unsigned long v) { - unsigned long *p = (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1]; - - /* KVM_SPSR_SVC aliases KVM_SPSR_EL1 */ if (vcpu_mode_is_32bit(vcpu)) { - unsigned long *p_32bit = vcpu_spsr32(vcpu); - - /* KVM_SPSR_SVC aliases KVM_SPSR_EL1 */ - if (p_32bit != p) { - *p_32bit = v; - return; - } + vcpu_write_spsr32(vcpu, v); + return; } if (vcpu->arch.sysregs_loaded_on_cpu) write_sysreg_el1(v, spsr); else - *p = v; + vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1] = v; } static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu) |