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Mon, 24 Jun 2019 08:07:53 -0700 (PDT) Received: from [192.168.1.34] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1DE383F71E; Mon, 24 Jun 2019 08:07:51 -0700 (PDT) Subject: Re: [PATCH 15/59] KVM: arm64: nv: Refactor vcpu_{read,write}_sys_reg To: Marc Zyngier , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org References: <20190621093843.220980-1-marc.zyngier@arm.com> <20190621093843.220980-16-marc.zyngier@arm.com> From: Julien Thierry Message-ID: Date: Mon, 24 Jun 2019 16:07:49 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20190621093843.220980-16-marc.zyngier@arm.com> Content-Language: en-US Cc: Andre Przywara , Dave Martin X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On 06/21/2019 10:37 AM, Marc Zyngier wrote: > Extract the direct HW accessors for later reuse. > > Signed-off-by: Marc Zyngier > --- > arch/arm64/kvm/sys_regs.c | 247 +++++++++++++++++++++----------------- > 1 file changed, 139 insertions(+), 108 deletions(-) > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > index 2b8734f75a09..e181359adadf 100644 > --- a/arch/arm64/kvm/sys_regs.c > +++ b/arch/arm64/kvm/sys_regs.c > @@ -182,99 +182,161 @@ const struct el2_sysreg_map *find_el2_sysreg(const struct el2_sysreg_map *map, > return entry; > } > > +static bool __vcpu_read_sys_reg_from_cpu(int reg, u64 *val) > +{ > + /* > + * System registers listed in the switch are not saved on every > + * exit from the guest but are only saved on vcpu_put. > + * > + * Note that MPIDR_EL1 for the guest is set by KVM via VMPIDR_EL2 but > + * should never be listed below, because the guest cannot modify its > + * own MPIDR_EL1 and MPIDR_EL1 is accessed for VCPU A from VCPU B's > + * thread when emulating cross-VCPU communication. > + */ > + switch (reg) { > + case CSSELR_EL1: *val = read_sysreg_s(SYS_CSSELR_EL1); break; > + case SCTLR_EL1: *val = read_sysreg_s(SYS_SCTLR_EL12); break; > + case ACTLR_EL1: *val = read_sysreg_s(SYS_ACTLR_EL1); break; > + case CPACR_EL1: *val = read_sysreg_s(SYS_CPACR_EL12); break; > + case TTBR0_EL1: *val = read_sysreg_s(SYS_TTBR0_EL12); break; > + case TTBR1_EL1: *val = read_sysreg_s(SYS_TTBR1_EL12); break; > + case TCR_EL1: *val = read_sysreg_s(SYS_TCR_EL12); break; > + case ESR_EL1: *val = read_sysreg_s(SYS_ESR_EL12); break; > + case AFSR0_EL1: *val = read_sysreg_s(SYS_AFSR0_EL12); break; > + case AFSR1_EL1: *val = read_sysreg_s(SYS_AFSR1_EL12); break; > + case FAR_EL1: *val = read_sysreg_s(SYS_FAR_EL12); break; > + case MAIR_EL1: *val = read_sysreg_s(SYS_MAIR_EL12); break; > + case VBAR_EL1: *val = read_sysreg_s(SYS_VBAR_EL12); break; > + case CONTEXTIDR_EL1: *val = read_sysreg_s(SYS_CONTEXTIDR_EL12);break; > + case TPIDR_EL0: *val = read_sysreg_s(SYS_TPIDR_EL0); break; > + case TPIDRRO_EL0: *val = read_sysreg_s(SYS_TPIDRRO_EL0); break; > + case TPIDR_EL1: *val = read_sysreg_s(SYS_TPIDR_EL1); break; > + case AMAIR_EL1: *val = read_sysreg_s(SYS_AMAIR_EL12); break; > + case CNTKCTL_EL1: *val = read_sysreg_s(SYS_CNTKCTL_EL12); break; > + case PAR_EL1: *val = read_sysreg_s(SYS_PAR_EL1); break; > + case DACR32_EL2: *val = read_sysreg_s(SYS_DACR32_EL2); break; > + case IFSR32_EL2: *val = read_sysreg_s(SYS_IFSR32_EL2); break; > + case DBGVCR32_EL2: *val = read_sysreg_s(SYS_DBGVCR32_EL2); break; > + default: return false; > + } > + > + return true; > +} > + > +static bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg) > +{ > + /* > + * System registers listed in the switch are not restored on every > + * entry to the guest but are only restored on vcpu_load. > + * > + * Note that MPIDR_EL1 for the guest is set by KVM via VMPIDR_EL2 but > + * should never be listed below, because the the MPIDR should only be > + * set once, before running the VCPU, and never changed later. > + */ > + switch (reg) { > + case CSSELR_EL1: write_sysreg_s(val, SYS_CSSELR_EL1); break; > + case SCTLR_EL1: write_sysreg_s(val, SYS_SCTLR_EL12); break; > + case ACTLR_EL1: write_sysreg_s(val, SYS_ACTLR_EL1); break; > + case CPACR_EL1: write_sysreg_s(val, SYS_CPACR_EL12); break; > + case TTBR0_EL1: write_sysreg_s(val, SYS_TTBR0_EL12); break; > + case TTBR1_EL1: write_sysreg_s(val, SYS_TTBR1_EL12); break; > + case TCR_EL1: write_sysreg_s(val, SYS_TCR_EL12); break; > + case ESR_EL1: write_sysreg_s(val, SYS_ESR_EL12); break; > + case AFSR0_EL1: write_sysreg_s(val, SYS_AFSR0_EL12); break; > + case AFSR1_EL1: write_sysreg_s(val, SYS_AFSR1_EL12); break; > + case FAR_EL1: write_sysreg_s(val, SYS_FAR_EL12); break; > + case MAIR_EL1: write_sysreg_s(val, SYS_MAIR_EL12); break; > + case VBAR_EL1: write_sysreg_s(val, SYS_VBAR_EL12); break; > + case CONTEXTIDR_EL1: write_sysreg_s(val, SYS_CONTEXTIDR_EL12);break; > + case TPIDR_EL0: write_sysreg_s(val, SYS_TPIDR_EL0); break; > + case TPIDRRO_EL0: write_sysreg_s(val, SYS_TPIDRRO_EL0); break; > + case TPIDR_EL1: write_sysreg_s(val, SYS_TPIDR_EL1); break; > + case AMAIR_EL1: write_sysreg_s(val, SYS_AMAIR_EL12); break; > + case CNTKCTL_EL1: write_sysreg_s(val, SYS_CNTKCTL_EL12); break; > + case PAR_EL1: write_sysreg_s(val, SYS_PAR_EL1); break; > + case DACR32_EL2: write_sysreg_s(val, SYS_DACR32_EL2); break; > + case IFSR32_EL2: write_sysreg_s(val, SYS_IFSR32_EL2); break; > + case DBGVCR32_EL2: write_sysreg_s(val, SYS_DBGVCR32_EL2); break; > + default: return false; > + } > + > + return true; > +} > + > u64 vcpu_read_sys_reg(const struct kvm_vcpu *vcpu, int reg) > { > - u64 val; > + u64 val = 0x8badf00d8badf00d; > > if (!vcpu->arch.sysregs_loaded_on_cpu) > - goto immediate_read; > + goto memory_read; > > if (unlikely(sysreg_is_el2(reg))) { > const struct el2_sysreg_map *el2_reg; > > if (!is_hyp_ctxt(vcpu)) > - goto immediate_read; > + goto memory_read; > > switch (reg) { > + case ELR_EL2: > + return read_sysreg_el1(SYS_ELR); Hmmm, This change feels a bit out of place. Also, patch 13 added ELR_EL2 and SP_EL2 to the switch cases for physical sysreg accesses. Now ELR_EL2 is moved out of the main switch cases and SP_EL2 is completely omitted. I'd say either patch 13 needs to be reworked or there is a separate patch that should be extracted from this patch to have an intermediate state, or the commit message on this patch should be more detailed. Cheers, -- Julien Thierry _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm