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Wed, 05 Aug 2020 18:57:18 +0100 From: Marc Zyngier To: Paolo Bonzini Subject: [PATCH 08/56] KVM: arm64: Drop the target_table[] indirection Date: Wed, 5 Aug 2020 18:56:12 +0100 Message-Id: <20200805175700.62775-9-maz@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200805175700.62775-1-maz@kernel.org> References: <20200805175700.62775-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: pbonzini@redhat.com, graf@amazon.com, alexandru.elisei@arm.com, ascull@google.com, catalin.marinas@arm.com, christoffer.dall@arm.com, dbrazdil@google.com, eric.auger@redhat.com, gshan@redhat.com, james.morse@arm.com, mark.rutland@arm.com, richard.peng@oppo.com, qperret@google.com, will@kernel.org, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200805_135721_259256_A7AA30B4 X-CRM114-Status: GOOD ( 19.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Peng Hao , kernel-team@android.com, Gavin Shan , kvm@vger.kernel.org, Will Deacon , Quentin Perret , Catalin Marinas , Suzuki K Poulose , Christoffer Dall , Eric Auger , Alexander Graf , Andrew Scull , James Morse , David Brazdil , Alexandru Elisei , kvmarm@lists.cs.columbia.edu, Julien Thierry , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: James Morse KVM for 32bit arm had a get/set target mechanism to allow for micro-architecture differences that are visible in system registers to be described. KVM's user-space can query the supported targets for a CPU, and create vCPUs for that target. The target can override the handling of system registers to provide different reset or RES0 behaviour. On 32bit arm this was used to provide different ACTLR reset values for A7 and A15. On 64bit arm, the first few CPUs out of the gate used this mechanism, before it was deemed redundant in commit bca556ac468a ("arm64/kvm: Add generic v8 KVM target"). All future CPUs use the KVM_ARM_TARGET_GENERIC_V8 target. The 64bit target_table[] stuff exists to preserve the ABI to user-space. As all targets registers genericv8_target_table, there is no reason to look the target up. Until we can merge genericv8_target_table with the main sys_regs array, kvm_register_target_sys_reg_table() becomes kvm_check_target_sys_reg_table(), which uses BUG_ON() in keeping with the other callers in this file. Signed-off-by: James Morse Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20200622113317.20477-2-james.morse@arm.com --- arch/arm64/include/asm/kvm_coproc.h | 3 +-- arch/arm64/kvm/sys_regs.c | 16 ++++------------ arch/arm64/kvm/sys_regs.h | 2 ++ arch/arm64/kvm/sys_regs_generic_v8.c | 15 ++------------- 4 files changed, 9 insertions(+), 27 deletions(-) diff --git a/arch/arm64/include/asm/kvm_coproc.h b/arch/arm64/include/asm/kvm_coproc.h index 0185ee8b8b5e..4bf0d6d05e0f 100644 --- a/arch/arm64/include/asm/kvm_coproc.h +++ b/arch/arm64/include/asm/kvm_coproc.h @@ -24,8 +24,7 @@ struct kvm_sys_reg_target_table { struct kvm_sys_reg_table table32; }; -void kvm_register_target_sys_reg_table(unsigned int target, - struct kvm_sys_reg_target_table *table); +void kvm_check_target_sys_reg_table(struct kvm_sys_reg_target_table *table); int kvm_handle_cp14_load_store(struct kvm_vcpu *vcpu, struct kvm_run *run); int kvm_handle_cp14_32(struct kvm_vcpu *vcpu, struct kvm_run *run); diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index baf5ce9225ce..6333a7cd92d3 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -2109,17 +2109,10 @@ static int check_sysreg_table(const struct sys_reg_desc *table, unsigned int n, return 0; } -/* Target specific emulation tables */ -static struct kvm_sys_reg_target_table *target_tables[KVM_ARM_NUM_TARGETS]; - -void kvm_register_target_sys_reg_table(unsigned int target, - struct kvm_sys_reg_target_table *table) +void kvm_check_target_sys_reg_table(struct kvm_sys_reg_target_table *table) { - if (check_sysreg_table(table->table64.table, table->table64.num, false) || - check_sysreg_table(table->table32.table, table->table32.num, true)) - return; - - target_tables[target] = table; + BUG_ON(check_sysreg_table(table->table64.table, table->table64.num, false)); + BUG_ON(check_sysreg_table(table->table32.table, table->table32.num, true)); } /* Get specific register table for this target. */ @@ -2127,9 +2120,8 @@ static const struct sys_reg_desc *get_target_table(unsigned target, bool mode_is_64, size_t *num) { - struct kvm_sys_reg_target_table *table; + struct kvm_sys_reg_target_table *table = &genericv8_target_table; - table = target_tables[target]; if (mode_is_64) { *num = table->table64.num; return table->table64.table; diff --git a/arch/arm64/kvm/sys_regs.h b/arch/arm64/kvm/sys_regs.h index 5a6fc30f5989..933609e883bf 100644 --- a/arch/arm64/kvm/sys_regs.h +++ b/arch/arm64/kvm/sys_regs.h @@ -165,4 +165,6 @@ const struct sys_reg_desc *find_reg_by_id(u64 id, CRn(sys_reg_CRn(reg)), CRm(sys_reg_CRm(reg)), \ Op2(sys_reg_Op2(reg)) +extern struct kvm_sys_reg_target_table genericv8_target_table; + #endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */ diff --git a/arch/arm64/kvm/sys_regs_generic_v8.c b/arch/arm64/kvm/sys_regs_generic_v8.c index aa9d356451eb..a82cc2ccfd44 100644 --- a/arch/arm64/kvm/sys_regs_generic_v8.c +++ b/arch/arm64/kvm/sys_regs_generic_v8.c @@ -59,7 +59,7 @@ static const struct sys_reg_desc genericv8_cp15_regs[] = { access_actlr }, }; -static struct kvm_sys_reg_target_table genericv8_target_table = { +struct kvm_sys_reg_target_table genericv8_target_table = { .table64 = { .table = genericv8_sys_regs, .num = ARRAY_SIZE(genericv8_sys_regs), @@ -78,18 +78,7 @@ static int __init sys_reg_genericv8_init(void) BUG_ON(cmp_sys_reg(&genericv8_sys_regs[i-1], &genericv8_sys_regs[i]) >= 0); - kvm_register_target_sys_reg_table(KVM_ARM_TARGET_AEM_V8, - &genericv8_target_table); - kvm_register_target_sys_reg_table(KVM_ARM_TARGET_FOUNDATION_V8, - &genericv8_target_table); - kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A53, - &genericv8_target_table); - kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A57, - &genericv8_target_table); - kvm_register_target_sys_reg_table(KVM_ARM_TARGET_XGENE_POTENZA, - &genericv8_target_table); - kvm_register_target_sys_reg_table(KVM_ARM_TARGET_GENERIC_V8, - &genericv8_target_table); + kvm_check_target_sys_reg_table(&genericv8_target_table); return 0; } -- 2.27.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel