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4c47eb1c18
The kprobe enablement work has uncovered that changes made by
a guest to MDSCR_EL1 were propagated to the host when VHE was
enabled, leading to unexpected exception being delivered.
Moving this register to the list of registers that are always
context-switched fixes the issue.
Fixes: 9c6c356832 ("arm64: KVM: VHE: Split save/restore of registers shared between guest and host")
Cc: stable@vger.kernel.org #4.6
Reported-by: Tirumalesh Chalamarla <Tirumalesh.Chalamarla@cavium.com>
Tested-by: Tirumalesh Chalamarla <Tirumalesh.Chalamarla@cavium.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
186 lines
6.4 KiB
C
186 lines
6.4 KiB
C
/*
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* Copyright (C) 2012-2015 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/compiler.h>
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#include <linux/kvm_host.h>
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#include <asm/kvm_asm.h>
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#include <asm/kvm_hyp.h>
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/* Yes, this does nothing, on purpose */
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static void __hyp_text __sysreg_do_nothing(struct kvm_cpu_context *ctxt) { }
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/*
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* Non-VHE: Both host and guest must save everything.
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*
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* VHE: Host must save tpidr*_el[01], actlr_el1, mdscr_el1, sp0, pc,
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* pstate, and guest must save everything.
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*/
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static void __hyp_text __sysreg_save_common_state(struct kvm_cpu_context *ctxt)
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{
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ctxt->sys_regs[ACTLR_EL1] = read_sysreg(actlr_el1);
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ctxt->sys_regs[TPIDR_EL0] = read_sysreg(tpidr_el0);
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ctxt->sys_regs[TPIDRRO_EL0] = read_sysreg(tpidrro_el0);
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ctxt->sys_regs[TPIDR_EL1] = read_sysreg(tpidr_el1);
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ctxt->sys_regs[MDSCR_EL1] = read_sysreg(mdscr_el1);
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ctxt->gp_regs.regs.sp = read_sysreg(sp_el0);
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ctxt->gp_regs.regs.pc = read_sysreg_el2(elr);
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ctxt->gp_regs.regs.pstate = read_sysreg_el2(spsr);
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}
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static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt)
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{
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ctxt->sys_regs[MPIDR_EL1] = read_sysreg(vmpidr_el2);
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ctxt->sys_regs[CSSELR_EL1] = read_sysreg(csselr_el1);
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ctxt->sys_regs[SCTLR_EL1] = read_sysreg_el1(sctlr);
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ctxt->sys_regs[CPACR_EL1] = read_sysreg_el1(cpacr);
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ctxt->sys_regs[TTBR0_EL1] = read_sysreg_el1(ttbr0);
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ctxt->sys_regs[TTBR1_EL1] = read_sysreg_el1(ttbr1);
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ctxt->sys_regs[TCR_EL1] = read_sysreg_el1(tcr);
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ctxt->sys_regs[ESR_EL1] = read_sysreg_el1(esr);
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ctxt->sys_regs[AFSR0_EL1] = read_sysreg_el1(afsr0);
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ctxt->sys_regs[AFSR1_EL1] = read_sysreg_el1(afsr1);
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ctxt->sys_regs[FAR_EL1] = read_sysreg_el1(far);
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ctxt->sys_regs[MAIR_EL1] = read_sysreg_el1(mair);
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ctxt->sys_regs[VBAR_EL1] = read_sysreg_el1(vbar);
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ctxt->sys_regs[CONTEXTIDR_EL1] = read_sysreg_el1(contextidr);
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ctxt->sys_regs[AMAIR_EL1] = read_sysreg_el1(amair);
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ctxt->sys_regs[CNTKCTL_EL1] = read_sysreg_el1(cntkctl);
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ctxt->sys_regs[PAR_EL1] = read_sysreg(par_el1);
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ctxt->gp_regs.sp_el1 = read_sysreg(sp_el1);
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ctxt->gp_regs.elr_el1 = read_sysreg_el1(elr);
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ctxt->gp_regs.spsr[KVM_SPSR_EL1]= read_sysreg_el1(spsr);
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}
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static hyp_alternate_select(__sysreg_call_save_host_state,
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__sysreg_save_state, __sysreg_do_nothing,
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ARM64_HAS_VIRT_HOST_EXTN);
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void __hyp_text __sysreg_save_host_state(struct kvm_cpu_context *ctxt)
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{
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__sysreg_call_save_host_state()(ctxt);
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__sysreg_save_common_state(ctxt);
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}
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void __hyp_text __sysreg_save_guest_state(struct kvm_cpu_context *ctxt)
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{
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__sysreg_save_state(ctxt);
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__sysreg_save_common_state(ctxt);
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}
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static void __hyp_text __sysreg_restore_common_state(struct kvm_cpu_context *ctxt)
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{
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write_sysreg(ctxt->sys_regs[ACTLR_EL1], actlr_el1);
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write_sysreg(ctxt->sys_regs[TPIDR_EL0], tpidr_el0);
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write_sysreg(ctxt->sys_regs[TPIDRRO_EL0], tpidrro_el0);
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write_sysreg(ctxt->sys_regs[TPIDR_EL1], tpidr_el1);
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write_sysreg(ctxt->sys_regs[MDSCR_EL1], mdscr_el1);
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write_sysreg(ctxt->gp_regs.regs.sp, sp_el0);
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write_sysreg_el2(ctxt->gp_regs.regs.pc, elr);
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write_sysreg_el2(ctxt->gp_regs.regs.pstate, spsr);
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}
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static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)
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{
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write_sysreg(ctxt->sys_regs[MPIDR_EL1], vmpidr_el2);
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write_sysreg(ctxt->sys_regs[CSSELR_EL1], csselr_el1);
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write_sysreg_el1(ctxt->sys_regs[SCTLR_EL1], sctlr);
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write_sysreg_el1(ctxt->sys_regs[CPACR_EL1], cpacr);
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write_sysreg_el1(ctxt->sys_regs[TTBR0_EL1], ttbr0);
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write_sysreg_el1(ctxt->sys_regs[TTBR1_EL1], ttbr1);
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write_sysreg_el1(ctxt->sys_regs[TCR_EL1], tcr);
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write_sysreg_el1(ctxt->sys_regs[ESR_EL1], esr);
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write_sysreg_el1(ctxt->sys_regs[AFSR0_EL1], afsr0);
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write_sysreg_el1(ctxt->sys_regs[AFSR1_EL1], afsr1);
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write_sysreg_el1(ctxt->sys_regs[FAR_EL1], far);
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write_sysreg_el1(ctxt->sys_regs[MAIR_EL1], mair);
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write_sysreg_el1(ctxt->sys_regs[VBAR_EL1], vbar);
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write_sysreg_el1(ctxt->sys_regs[CONTEXTIDR_EL1],contextidr);
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write_sysreg_el1(ctxt->sys_regs[AMAIR_EL1], amair);
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write_sysreg_el1(ctxt->sys_regs[CNTKCTL_EL1], cntkctl);
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write_sysreg(ctxt->sys_regs[PAR_EL1], par_el1);
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write_sysreg(ctxt->gp_regs.sp_el1, sp_el1);
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write_sysreg_el1(ctxt->gp_regs.elr_el1, elr);
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write_sysreg_el1(ctxt->gp_regs.spsr[KVM_SPSR_EL1],spsr);
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}
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static hyp_alternate_select(__sysreg_call_restore_host_state,
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__sysreg_restore_state, __sysreg_do_nothing,
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ARM64_HAS_VIRT_HOST_EXTN);
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void __hyp_text __sysreg_restore_host_state(struct kvm_cpu_context *ctxt)
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{
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__sysreg_call_restore_host_state()(ctxt);
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__sysreg_restore_common_state(ctxt);
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}
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void __hyp_text __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt)
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{
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__sysreg_restore_state(ctxt);
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__sysreg_restore_common_state(ctxt);
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}
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void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu)
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{
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u64 *spsr, *sysreg;
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if (read_sysreg(hcr_el2) & HCR_RW)
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return;
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spsr = vcpu->arch.ctxt.gp_regs.spsr;
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sysreg = vcpu->arch.ctxt.sys_regs;
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spsr[KVM_SPSR_ABT] = read_sysreg(spsr_abt);
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spsr[KVM_SPSR_UND] = read_sysreg(spsr_und);
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spsr[KVM_SPSR_IRQ] = read_sysreg(spsr_irq);
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spsr[KVM_SPSR_FIQ] = read_sysreg(spsr_fiq);
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sysreg[DACR32_EL2] = read_sysreg(dacr32_el2);
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sysreg[IFSR32_EL2] = read_sysreg(ifsr32_el2);
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if (__fpsimd_enabled())
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sysreg[FPEXC32_EL2] = read_sysreg(fpexc32_el2);
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if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
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sysreg[DBGVCR32_EL2] = read_sysreg(dbgvcr32_el2);
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}
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void __hyp_text __sysreg32_restore_state(struct kvm_vcpu *vcpu)
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{
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u64 *spsr, *sysreg;
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if (read_sysreg(hcr_el2) & HCR_RW)
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return;
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spsr = vcpu->arch.ctxt.gp_regs.spsr;
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sysreg = vcpu->arch.ctxt.sys_regs;
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write_sysreg(spsr[KVM_SPSR_ABT], spsr_abt);
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write_sysreg(spsr[KVM_SPSR_UND], spsr_und);
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write_sysreg(spsr[KVM_SPSR_IRQ], spsr_irq);
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write_sysreg(spsr[KVM_SPSR_FIQ], spsr_fiq);
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write_sysreg(sysreg[DACR32_EL2], dacr32_el2);
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write_sysreg(sysreg[IFSR32_EL2], ifsr32_el2);
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if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
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write_sysreg(sysreg[DBGVCR32_EL2], dbgvcr32_el2);
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}
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