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author | Marc Zyngier <marc.zyngier@arm.com> | 2015-10-28 12:39:38 (GMT) |
---|---|---|
committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-02-29 18:34:17 (GMT) |
commit | 9c6c35683286ddf47baf8c6d1931f3af63379490 (patch) | |
tree | 3dc327d02b8c85c92a6569c40089e210a9b4add4 | |
parent | edef528dc4bdab1504e72e0f5436b18f3777efc0 (diff) | |
download | linux-9c6c35683286ddf47baf8c6d1931f3af63379490.tar.xz |
arm64: KVM: VHE: Split save/restore of registers shared between guest and host
A handful of system registers are still shared between host and guest,
even while using VHE (tpidr*_el[01] and actlr_el1).
Also, some of the vcpu state (sp_el0, PC and PSTATE) must be
save/restored on entry/exit, as they are used on the host as well.
In order to facilitate the introduction of a VHE-specific sysreg
save/restore, make move the access to these registers to their
own save/restore functions.
No functional change.
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
-rw-r--r-- | arch/arm64/kvm/hyp/sysreg-sr.c | 48 |
1 files changed, 33 insertions, 15 deletions
diff --git a/arch/arm64/kvm/hyp/sysreg-sr.c b/arch/arm64/kvm/hyp/sysreg-sr.c index bd5b543..61bad17 100644 --- a/arch/arm64/kvm/hyp/sysreg-sr.c +++ b/arch/arm64/kvm/hyp/sysreg-sr.c @@ -23,13 +23,29 @@ #include "hyp.h" -/* ctxt is already in the HYP VA space */ +/* + * Non-VHE: Both host and guest must save everything. + * + * VHE: Host must save tpidr*_el[01], actlr_el1, sp0, pc, pstate, and + * guest must save everything. + */ + +static void __hyp_text __sysreg_save_common_state(struct kvm_cpu_context *ctxt) +{ + ctxt->sys_regs[ACTLR_EL1] = read_sysreg(actlr_el1); + ctxt->sys_regs[TPIDR_EL0] = read_sysreg(tpidr_el0); + ctxt->sys_regs[TPIDRRO_EL0] = read_sysreg(tpidrro_el0); + ctxt->sys_regs[TPIDR_EL1] = read_sysreg(tpidr_el1); + ctxt->gp_regs.regs.sp = read_sysreg(sp_el0); + ctxt->gp_regs.regs.pc = read_sysreg(elr_el2); + ctxt->gp_regs.regs.pstate = read_sysreg(spsr_el2); +} + static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt) { ctxt->sys_regs[MPIDR_EL1] = read_sysreg(vmpidr_el2); ctxt->sys_regs[CSSELR_EL1] = read_sysreg(csselr_el1); ctxt->sys_regs[SCTLR_EL1] = read_sysreg(sctlr_el1); - ctxt->sys_regs[ACTLR_EL1] = read_sysreg(actlr_el1); ctxt->sys_regs[CPACR_EL1] = read_sysreg(cpacr_el1); ctxt->sys_regs[TTBR0_EL1] = read_sysreg(ttbr0_el1); ctxt->sys_regs[TTBR1_EL1] = read_sysreg(ttbr1_el1); @@ -41,17 +57,11 @@ static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt) ctxt->sys_regs[MAIR_EL1] = read_sysreg(mair_el1); ctxt->sys_regs[VBAR_EL1] = read_sysreg(vbar_el1); ctxt->sys_regs[CONTEXTIDR_EL1] = read_sysreg(contextidr_el1); - ctxt->sys_regs[TPIDR_EL0] = read_sysreg(tpidr_el0); - ctxt->sys_regs[TPIDRRO_EL0] = read_sysreg(tpidrro_el0); - ctxt->sys_regs[TPIDR_EL1] = read_sysreg(tpidr_el1); ctxt->sys_regs[AMAIR_EL1] = read_sysreg(amair_el1); ctxt->sys_regs[CNTKCTL_EL1] = read_sysreg(cntkctl_el1); ctxt->sys_regs[PAR_EL1] = read_sysreg(par_el1); ctxt->sys_regs[MDSCR_EL1] = read_sysreg(mdscr_el1); - ctxt->gp_regs.regs.sp = read_sysreg(sp_el0); - ctxt->gp_regs.regs.pc = read_sysreg(elr_el2); - ctxt->gp_regs.regs.pstate = read_sysreg(spsr_el2); ctxt->gp_regs.sp_el1 = read_sysreg(sp_el1); ctxt->gp_regs.elr_el1 = read_sysreg(elr_el1); ctxt->gp_regs.spsr[KVM_SPSR_EL1]= read_sysreg(spsr_el1); @@ -60,11 +70,24 @@ static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt) void __hyp_text __sysreg_save_host_state(struct kvm_cpu_context *ctxt) { __sysreg_save_state(ctxt); + __sysreg_save_common_state(ctxt); } void __hyp_text __sysreg_save_guest_state(struct kvm_cpu_context *ctxt) { __sysreg_save_state(ctxt); + __sysreg_save_common_state(ctxt); +} + +static void __hyp_text __sysreg_restore_common_state(struct kvm_cpu_context *ctxt) +{ + write_sysreg(ctxt->sys_regs[ACTLR_EL1], actlr_el1); + write_sysreg(ctxt->sys_regs[TPIDR_EL0], tpidr_el0); + write_sysreg(ctxt->sys_regs[TPIDRRO_EL0], tpidrro_el0); + write_sysreg(ctxt->sys_regs[TPIDR_EL1], tpidr_el1); + write_sysreg(ctxt->gp_regs.regs.sp, sp_el0); + write_sysreg(ctxt->gp_regs.regs.pc, elr_el2); + write_sysreg(ctxt->gp_regs.regs.pstate, spsr_el2); } static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt) @@ -72,7 +95,6 @@ static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt) write_sysreg(ctxt->sys_regs[MPIDR_EL1], vmpidr_el2); write_sysreg(ctxt->sys_regs[CSSELR_EL1], csselr_el1); write_sysreg(ctxt->sys_regs[SCTLR_EL1], sctlr_el1); - write_sysreg(ctxt->sys_regs[ACTLR_EL1], actlr_el1); write_sysreg(ctxt->sys_regs[CPACR_EL1], cpacr_el1); write_sysreg(ctxt->sys_regs[TTBR0_EL1], ttbr0_el1); write_sysreg(ctxt->sys_regs[TTBR1_EL1], ttbr1_el1); @@ -84,17 +106,11 @@ static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt) write_sysreg(ctxt->sys_regs[MAIR_EL1], mair_el1); write_sysreg(ctxt->sys_regs[VBAR_EL1], vbar_el1); write_sysreg(ctxt->sys_regs[CONTEXTIDR_EL1], contextidr_el1); - write_sysreg(ctxt->sys_regs[TPIDR_EL0], tpidr_el0); - write_sysreg(ctxt->sys_regs[TPIDRRO_EL0], tpidrro_el0); - write_sysreg(ctxt->sys_regs[TPIDR_EL1], tpidr_el1); write_sysreg(ctxt->sys_regs[AMAIR_EL1], amair_el1); write_sysreg(ctxt->sys_regs[CNTKCTL_EL1], cntkctl_el1); write_sysreg(ctxt->sys_regs[PAR_EL1], par_el1); write_sysreg(ctxt->sys_regs[MDSCR_EL1], mdscr_el1); - write_sysreg(ctxt->gp_regs.regs.sp, sp_el0); - write_sysreg(ctxt->gp_regs.regs.pc, elr_el2); - write_sysreg(ctxt->gp_regs.regs.pstate, spsr_el2); write_sysreg(ctxt->gp_regs.sp_el1, sp_el1); write_sysreg(ctxt->gp_regs.elr_el1, elr_el1); write_sysreg(ctxt->gp_regs.spsr[KVM_SPSR_EL1], spsr_el1); @@ -103,11 +119,13 @@ static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt) void __hyp_text __sysreg_restore_host_state(struct kvm_cpu_context *ctxt) { __sysreg_restore_state(ctxt); + __sysreg_restore_common_state(ctxt); } void __hyp_text __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt) { __sysreg_restore_state(ctxt); + __sysreg_restore_common_state(ctxt); } void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu) |