[PATCH v2 10/21] arm64: KVM: VHE: Split save/restore of sysregs shared between EL1 and EL2
From: Christoffer Dall <hidden>
Date: 2016-02-01 13:54:33
Also in:
kvm, kvmarm, lkml
On Mon, Jan 25, 2016 at 03:53:44PM +0000, Marc Zyngier wrote:
A handful of system registers are still shared between EL1 and EL2, even while using VHE. These are tpidr*_el[01], actlr_el1, sp0, elr, and spsr.
So by shared registers you mean registers that do both have an EL0/1 version as well as an EL2 version, but where accesses aren't rewritten transparently? also, by sp0 do you mean sp_el0, and by elr you mean elr_el1, and by spsr you mean spsr_el1 ?
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 functionnal change.
Otherwise: Reviewed-by: Christoffer Dall <redacted>
quoted hunk ↗ jump to hunk
Signed-off-by: Marc Zyngier <redacted> --- arch/arm64/kvm/hyp/sysreg-sr.c | 48 +++++++++++++++++++++++++++++------------- 1 file 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)-- 2.1.4