From patchwork Fri Feb 22 19:04:20 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 15038 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id E007F23E4C for ; Fri, 22 Feb 2013 19:04:41 +0000 (UTC) Received: from mail-vc0-f177.google.com (mail-vc0-f177.google.com [209.85.220.177]) by fiordland.canonical.com (Postfix) with ESMTP id 81334A18D16 for ; Fri, 22 Feb 2013 19:04:41 +0000 (UTC) Received: by mail-vc0-f177.google.com with SMTP id m18so616637vcm.36 for ; Fri, 22 Feb 2013 11:04:41 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=x-received:x-forwarded-to:x-forwarded-for:delivered-to:x-received :received-spf:from:to:cc:subject:date:message-id:x-mailer :in-reply-to:references:x-gm-message-state; bh=yCnFLp3sbfrmN5f6XwXKuBX+dy2jIIDvyu/iqZbVtBI=; b=mXEytpbgOb+GRNiL/G71UocdiM5bpBkTsnSnOnSCvOMCv50+/6H8DgPtT6aiC6CfvM 1sUZYw2GywN4g6oDe072Tkp01BUVUd/f4C6iJJOm8/XICXofWqst4v0irb+SDx/bdIl1 AlN/Z2THN/VkBwZQAWPRRfN33BgqDYkZGbcI/YX9u9pkgAg0Pxo02rY4JUrcclrhwgmF Chf/ejmYW4BFHbk7qh08OoK555o0/V8TKXW5yOak0hyBgKufEnE5npZmpZUTyFAQLJ5f rEmS+LgrLWydF1OngCyv3YT1YWQOAQsQpfaN9ULNfR1fbcn9kY3PhLEDwpr89lld+A94 bxYA== X-Received: by 10.220.149.82 with SMTP id s18mr4195386vcv.14.1361559880964; Fri, 22 Feb 2013 11:04:40 -0800 (PST) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.58.145.101 with SMTP id st5csp103656veb; Fri, 22 Feb 2013 11:04:40 -0800 (PST) X-Received: by 10.66.120.200 with SMTP id le8mr5801589pab.23.1361559876000; Fri, 22 Feb 2013 11:04:36 -0800 (PST) Received: from mnementh.archaic.org.uk (1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.d.1.0.0.b.8.0.1.0.0.2.ip6.arpa. [2001:8b0:1d0::1]) by mx.google.com with ESMTPS id k6si3711303pay.341.2013.02.22.11.04.34 (version=TLSv1 cipher=RC4-SHA bits=128/128); Fri, 22 Feb 2013 11:04:35 -0800 (PST) Received-SPF: neutral (google.com: 2001:8b0:1d0::1 is neither permitted nor denied by best guess record for domain of pm215@archaic.org.uk) client-ip=2001:8b0:1d0::1; Authentication-Results: mx.google.com; spf=neutral (google.com: 2001:8b0:1d0::1 is neither permitted nor denied by best guess record for domain of pm215@archaic.org.uk) smtp.mail=pm215@archaic.org.uk Received: from pm215 by mnementh.archaic.org.uk with local (Exim 4.72) (envelope-from ) id 1U8xuz-0005m7-7C; Fri, 22 Feb 2013 19:04:25 +0000 From: Peter Maydell To: qemu-devel@nongnu.org Cc: patches@linaro.org, kvm@vger.kernel.org, Marcelo Tosatti , kvmarm@lists.cs.columbia.edu, Blue Swirl , =?UTF-8?q?Andreas=20F=C3=A4rber?= , Gleb Natapov , Christoffer Dall , Paolo Bonzini Subject: [PATCH v6 4/9] ARM KVM: save and load VFP registers from kernel Date: Fri, 22 Feb 2013 19:04:20 +0000 Message-Id: <1361559865-22168-5-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1361559865-22168-1-git-send-email-peter.maydell@linaro.org> References: <1361559865-22168-1-git-send-email-peter.maydell@linaro.org> X-Gm-Message-State: ALoCoQmtJ3ZR2uZITAktooC1vXMyNDiKzA12Fh5+8tMqWq8iT45u6/cycaoE4pwcRV3sTRxykN3q Add support for saving and restoring VFP register state from the kernel. This includes a check that the KVM-created CPU has full VFP support (as the TCG Cortex-A15 model always does), since for the moment ARM QEMU doesn't have any way to tweak optional features on created CPUs. Signed-off-by: Peter Maydell Reviewed-by: Paolo Bonzini --- target-arm/kvm.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 75 insertions(+), 3 deletions(-) diff --git a/target-arm/kvm.c b/target-arm/kvm.c index 13ebfd7..5cd9086 100644 --- a/target-arm/kvm.c +++ b/target-arm/kvm.c @@ -43,10 +43,28 @@ unsigned long kvm_arch_vcpu_id(CPUState *cpu) int kvm_arch_init_vcpu(CPUState *cs) { struct kvm_vcpu_init init; + int ret; + uint64_t v; + struct kvm_one_reg r; init.target = KVM_ARM_TARGET_CORTEX_A15; memset(init.features, 0, sizeof(init.features)); - return kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init); + ret = kvm_vcpu_ioctl(cs, KVM_ARM_VCPU_INIT, &init); + if (ret) { + return ret; + } + /* Query the kernel to make sure it supports 32 VFP + * registers: QEMU's "cortex-a15" CPU is always a + * VFP-D32 core. The simplest way to do this is just + * to attempt to read register d31. + */ + r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_VFP | 31; + r.addr = (uintptr_t)(&v); + ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r); + if (ret == ENOENT) { + return EINVAL; + } + return ret; } typedef struct Reg { @@ -72,6 +90,13 @@ typedef struct Reg { offsetof(CPUARMState, QEMUFIELD) \ } +#define VFPSYSREG(R) \ + { \ + KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_VFP | \ + KVM_REG_ARM_VFP_##R, \ + offsetof(CPUARMState, vfp.xregs[ARM_VFP_##R]) \ + } + static const Reg regs[] = { /* R0_usr .. R14_usr */ COREREG(usr_regs.uregs[0], regs[0]), @@ -119,6 +144,13 @@ static const Reg regs[] = { CP15REG(1, 0, 0, 0, cp15.c1_sys), /* SCTLR */ CP15REG(2, 0, 0, 2, cp15.c2_control), /* TTBCR */ CP15REG(3, 0, 0, 0, cp15.c3), /* DACR */ + /* VFP system registers */ + VFPSYSREG(FPSID), + VFPSYSREG(MVFR1), + VFPSYSREG(MVFR0), + VFPSYSREG(FPEXC), + VFPSYSREG(FPINST), + VFPSYSREG(FPINST2), }; int kvm_arch_put_registers(CPUState *cs, int level) @@ -128,7 +160,7 @@ int kvm_arch_put_registers(CPUState *cs, int level) struct kvm_one_reg r; int mode, bn; int ret, i; - uint32_t cpsr; + uint32_t cpsr, fpscr; uint64_t ttbr; /* Make sure the banked regs are properly set */ @@ -179,6 +211,26 @@ int kvm_arch_put_registers(CPUState *cs, int level) (2 << KVM_REG_ARM_CRM_SHIFT) | (1 << KVM_REG_ARM_OPC1_SHIFT); r.addr = (uintptr_t)(&ttbr); ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r); + if (ret) { + return ret; + } + + /* VFP registers */ + r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_VFP; + for (i = 0; i < 32; i++) { + r.addr = (uintptr_t)(&env->vfp.regs[i]); + ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r); + if (ret) { + return ret; + } + r.id++; + } + + r.id = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_VFP | + KVM_REG_ARM_VFP_FPSCR; + fpscr = vfp_get_fpscr(env); + r.addr = (uintptr_t)&fpscr; + ret = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &r); return ret; } @@ -190,7 +242,7 @@ int kvm_arch_get_registers(CPUState *cs) struct kvm_one_reg r; int mode, bn; int ret, i; - uint32_t cpsr; + uint32_t cpsr, fpscr; uint64_t ttbr; for (i = 0; i < ARRAY_SIZE(regs); i++) { @@ -255,6 +307,26 @@ int kvm_arch_get_registers(CPUState *cs) env->cp15.c2_mask = ~(0xffffffffu >> env->cp15.c2_control); env->cp15.c2_base_mask = ~(0x3fffu >> env->cp15.c2_control); + /* VFP registers */ + r.id = KVM_REG_ARM | KVM_REG_SIZE_U64 | KVM_REG_ARM_VFP; + for (i = 0; i < 32; i++) { + r.addr = (uintptr_t)(&env->vfp.regs[i]); + ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r); + if (ret) { + return ret; + } + r.id++; + } + + r.id = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_VFP | + KVM_REG_ARM_VFP_FPSCR; + r.addr = (uintptr_t)&fpscr; + ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &r); + if (ret) { + return ret; + } + vfp_set_fpscr(env, fpscr); + return 0; }