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[2001:16b8:2b53:c500:4989:ea3b:b9da:8dea]) by smtp.gmail.com with ESMTPSA id w18sm4902609wrg.68.2021.08.18.00.09.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Aug 2021 00:09:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=IGArX2IrQtjF8xMsXRaWuGTG5yGCdBd/S4BPB2HvfpE=; b=vJ9Tc+il4vJc9TNFvMsRvhyXDKnhAnHxwupRwtegXN6S4aIvq0mw49y29RcsnlGgJp CYNfMYPeWo2zENSSQw+hoFm8KfNW1PpLfbu9nZxqkxqbrWfCbBJT7rXShgPNVHdc7ogY 0bGShLz1kMDh0+Zt69mTBUL+q4dqXnLC/1xB3hL/NBLbEMbo14+21ilqjJNUjliKlwjy /7BNzVtlhnZ/hjNLhu9whitvNdZ4+QjWQ0njP8B6JFQSJ1AeeWWRJxf7/1z7+AZvuAY/ x/LHM7HILKdo93FSSldEW06y7dPA3rteSRyJK7mcfwqJJ6F75ROAN+ycxEVPUzzyaErk kJ9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=IGArX2IrQtjF8xMsXRaWuGTG5yGCdBd/S4BPB2HvfpE=; b=SNChgT1kN+Psr3k1ib18I1uh0zvdLqgsGdv8hKQvt3TgVbtxoC+WmSxG0mO6pYp+E3 przKHqM+LSZA726rrFy+HPdHjb36St/H6POGJSEE86TtpzGUGwGKuH9h8aI/d6u/eE1D FpSguJFBYDYhabTBg842ze3+tbaNrDxnwhF7n7mJCVjfqgiOu1jtSzRs31fdjNOxsaYa meexwN3lVEiO/n16Ol7Y/R5jG57WvbWadRxiSSkLPfyTUwebJ5fjFhg66HjFg2ThsjZ9 2SE+V8qDSvMx5J6/F6BA3c88FMDuQFCADlBeqBKsdpNBYQM/0D+AwmoD1LlO5fziNmk8 6dMA== X-Gm-Message-State: AOAM532iK0ZhJgHz3sRtGXW264oheX9sr/Cg52+lTQIdprQvk6RgbmW0 goY0MVSYKFzJTSEGpGHdm/kCkSuUK9M= X-Google-Smtp-Source: ABdhPJwhKq16nzdzOy/aSIocdv8kRwRTDqayYT3mOIpmaM4a0DUZRiBSRfGITrYKgUYuFILvIDYgyg== X-Received: by 2002:a1c:1b4b:: with SMTP id b72mr7113849wmb.168.1629270544024; Wed, 18 Aug 2021 00:09:04 -0700 (PDT) From: Lara Lazier To: qemu-devel@nongnu.org Subject: [PATCH] target/i386: Added vVMLOAD and vVMSAVE feature Date: Wed, 18 Aug 2021 09:08:34 +0200 Message-Id: <20210818070838.44344-2-laramglazier@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210818070838.44344-1-laramglazier@gmail.com> References: <20210818070838.44344-1-laramglazier@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::32c; envelope-from=laramglazier@gmail.com; helo=mail-wm1-x32c.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com, Lara Lazier Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1629270736746100006 Content-Type: text/plain; charset="utf-8" The feature allows the VMSAVE and VMLOAD instructions to execute in guest m= ode without causing a VMEXIT. (APM2 15.33.1) This is currently untested; I sent it out as part of my GSoC project. Signed-off-by: Lara Lazier --- target/i386/cpu.h | 2 ++ target/i386/svm.h | 2 ++ target/i386/tcg/sysemu/excp_helper.c | 2 +- target/i386/tcg/sysemu/svm_helper.c | 29 ++++++++++++++++++++++++++++ 4 files changed, 34 insertions(+), 1 deletion(-) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 69e722253d..573adc8c22 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -2260,6 +2260,8 @@ static inline bool ctl_has_irq(CPUX86State *env) return (env->int_ctl & V_IRQ_MASK) && (int_prio >=3D tpr); } =20 +hwaddr get_hphys(CPUState *cs, hwaddr gphys, MMUAccessType access_type, + int *prot); #if defined(TARGET_X86_64) && \ defined(CONFIG_USER_ONLY) && \ defined(CONFIG_LINUX) diff --git a/target/i386/svm.h b/target/i386/svm.h index 036597a2ff..f9a785489d 100644 --- a/target/i386/svm.h +++ b/target/i386/svm.h @@ -24,6 +24,8 @@ #define V_INTR_MASKING_SHIFT 24 #define V_INTR_MASKING_MASK (1 << V_INTR_MASKING_SHIFT) =20 +#define V_VMLOAD_VMSAVE_ENABLED_MASK (1 << 1) + #define SVM_INTERRUPT_SHADOW_MASK 1 =20 #define SVM_IOIO_STR_SHIFT 2 diff --git a/target/i386/tcg/sysemu/excp_helper.c b/target/i386/tcg/sysemu/= excp_helper.c index b6d940e04e..7af887be4d 100644 --- a/target/i386/tcg/sysemu/excp_helper.c +++ b/target/i386/tcg/sysemu/excp_helper.c @@ -358,7 +358,7 @@ do_check_protect_pse36: return error_code; } =20 -static hwaddr get_hphys(CPUState *cs, hwaddr gphys, MMUAccessType access_t= ype, +hwaddr get_hphys(CPUState *cs, hwaddr gphys, MMUAccessType access_type, int *prot) { CPUX86State *env =3D &X86_CPU(cs)->env; diff --git a/target/i386/tcg/sysemu/svm_helper.c b/target/i386/tcg/sysemu/s= vm_helper.c index 312f10f1e4..94dd2083ce 100644 --- a/target/i386/tcg/sysemu/svm_helper.c +++ b/target/i386/tcg/sysemu/svm_helper.c @@ -120,6 +120,25 @@ static inline bool virtual_gif_enabled(CPUX86State *en= v) return false; } =20 +static inline bool virtual_vm_load_save_enabled(CPUX86State *env, uint32_t= exit_code, uintptr_t retaddr) +{ + uint64_t lbr_ctl; + + if (likely(env->hflags & HF_GUEST_MASK)) { + if (likely(!(env->hflags2 & HF2_NPT_MASK)) || !(env->efer & MSR_EF= ER_LMA)) { + cpu_vmexit(env, exit_code, 0, retaddr); + } + + lbr_ctl =3D x86_ldl_phys(env_cpu(env), env->vm_vmcb + offsetof(str= uct vmcb, + control.lbr_ctl)); + return (env->features[FEAT_SVM] & CPUID_SVM_V_VMSAVE_VMLOAD) + && (lbr_ctl & V_VMLOAD_VMSAVE_ENABLED_MASK); + + } + + return false; +} + static inline bool virtual_gif_set(CPUX86State *env) { return !virtual_gif_enabled(env) || (env->int_ctl & V_GIF_MASK); @@ -430,6 +449,7 @@ void helper_vmload(CPUX86State *env, int aflag) { CPUState *cs =3D env_cpu(env); target_ulong addr; + int prot; =20 cpu_svm_check_intercept_param(env, SVM_EXIT_VMLOAD, 0, GETPC()); =20 @@ -439,6 +459,10 @@ void helper_vmload(CPUX86State *env, int aflag) addr =3D (uint32_t)env->regs[R_EAX]; } =20 + if (virtual_vm_load_save_enabled(env, SVM_EXIT_VMLOAD, GETPC())) { + addr =3D get_hphys(cs, addr, MMU_DATA_LOAD, &prot); + } + qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmload! " TARGET_FMT_lx "\nFS: %016" PRIx64 " | " TARGET_FMT_lx "\n", addr, x86_ldq_phys(cs, addr + offsetof(struct vmcb, @@ -472,6 +496,7 @@ void helper_vmsave(CPUX86State *env, int aflag) { CPUState *cs =3D env_cpu(env); target_ulong addr; + int prot; =20 cpu_svm_check_intercept_param(env, SVM_EXIT_VMSAVE, 0, GETPC()); =20 @@ -481,6 +506,10 @@ void helper_vmsave(CPUX86State *env, int aflag) addr =3D (uint32_t)env->regs[R_EAX]; } =20 + if (virtual_vm_load_save_enabled(env, SVM_EXIT_VMSAVE, GETPC())) { + addr =3D get_hphys(cs, addr, MMU_DATA_STORE, &prot); + } + qemu_log_mask(CPU_LOG_TB_IN_ASM, "vmsave! " TARGET_FMT_lx "\nFS: %016" PRIx64 " | " TARGET_FMT_lx "\n", addr, x86_ldq_phys(cs, --=20 2.25.1