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envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::432; envelope-from=laramglazier@gmail.com; helo=mail-wr1-x432.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: Lara Lazier Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) Content-Type: text/plain; charset="utf-8" Added cpu_svm_has_intercept to reduce duplication when checking the corresponding intercept bit outside of cpu_svm_check_intercept_param Signed-off-by: Lara Lazier --- target/i386/cpu.h | 3 + target/i386/tcg/sysemu/svm_helper.c | 105 +++++++++++++++------------- 2 files changed, 61 insertions(+), 47 deletions(-) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index ac3abea97c..59b9231ee2 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -2149,9 +2149,12 @@ static inline void cpu_svm_check_intercept_param(CPUX86State *env1, uint32_t type, uint64_t param, uintptr_t retaddr) { /* no-op */ } +bool cpu_svm_has_intercept(CPUX86State *env, uint32_t type) +{ return false; } #else void cpu_svm_check_intercept_param(CPUX86State *env1, uint32_t type, uint64_t param, uintptr_t retaddr); +bool cpu_svm_has_intercept(CPUX86State *env, uint32_t type); #endif =20 /* apic.c */ diff --git a/target/i386/tcg/sysemu/svm_helper.c b/target/i386/tcg/sysemu/s= vm_helper.c index 9d671297cf..2f7606bebf 100644 --- a/target/i386/tcg/sysemu/svm_helper.c +++ b/target/i386/tcg/sysemu/svm_helper.c @@ -412,80 +412,91 @@ void helper_clgi(CPUX86State *env) env->hflags2 &=3D ~HF2_GIF_MASK; } =20 -void cpu_svm_check_intercept_param(CPUX86State *env, uint32_t type, - uint64_t param, uintptr_t retaddr) +bool cpu_svm_has_intercept(CPUX86State *env, uint32_t type) { - CPUState *cs =3D env_cpu(env); - - if (likely(!(env->hflags & HF_GUEST_MASK))) { - return; - } switch (type) { case SVM_EXIT_READ_CR0 ... SVM_EXIT_READ_CR0 + 8: if (env->intercept_cr_read & (1 << (type - SVM_EXIT_READ_CR0))) { - cpu_vmexit(env, type, param, retaddr); + return true; } break; case SVM_EXIT_WRITE_CR0 ... SVM_EXIT_WRITE_CR0 + 8: if (env->intercept_cr_write & (1 << (type - SVM_EXIT_WRITE_CR0))) { - cpu_vmexit(env, type, param, retaddr); + return true; } break; case SVM_EXIT_READ_DR0 ... SVM_EXIT_READ_DR0 + 7: if (env->intercept_dr_read & (1 << (type - SVM_EXIT_READ_DR0))) { - cpu_vmexit(env, type, param, retaddr); + return true; } break; case SVM_EXIT_WRITE_DR0 ... SVM_EXIT_WRITE_DR0 + 7: if (env->intercept_dr_write & (1 << (type - SVM_EXIT_WRITE_DR0))) { - cpu_vmexit(env, type, param, retaddr); + return true; } break; case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 31: if (env->intercept_exceptions & (1 << (type - SVM_EXIT_EXCP_BASE))= ) { - cpu_vmexit(env, type, param, retaddr); - } - break; - case SVM_EXIT_MSR: - if (env->intercept & (1ULL << (SVM_EXIT_MSR - SVM_EXIT_INTR))) { - /* FIXME: this should be read in at vmrun (faster this way?) */ - uint64_t addr =3D x86_ldq_phys(cs, env->vm_vmcb + - offsetof(struct vmcb, - control.msrpm_base_pa)); - uint32_t t0, t1; - - switch ((uint32_t)env->regs[R_ECX]) { - case 0 ... 0x1fff: - t0 =3D (env->regs[R_ECX] * 2) % 8; - t1 =3D (env->regs[R_ECX] * 2) / 8; - break; - case 0xc0000000 ... 0xc0001fff: - t0 =3D (8192 + env->regs[R_ECX] - 0xc0000000) * 2; - t1 =3D (t0 / 8); - t0 %=3D 8; - break; - case 0xc0010000 ... 0xc0011fff: - t0 =3D (16384 + env->regs[R_ECX] - 0xc0010000) * 2; - t1 =3D (t0 / 8); - t0 %=3D 8; - break; - default: - cpu_vmexit(env, type, param, retaddr); - t0 =3D 0; - t1 =3D 0; - break; - } - if (x86_ldub_phys(cs, addr + t1) & ((1 << param) << t0)) { - cpu_vmexit(env, type, param, retaddr); - } + return true; } break; default: if (env->intercept & (1ULL << (type - SVM_EXIT_INTR))) { - cpu_vmexit(env, type, param, retaddr); + return true; } break; } + return false; +} + +void cpu_svm_check_intercept_param(CPUX86State *env, uint32_t type, + uint64_t param, uintptr_t retaddr) +{ + CPUState *cs =3D env_cpu(env); + + if (likely(!(env->hflags & HF_GUEST_MASK))) { + return; + } + + if (!cpu_svm_has_intercept(env, type)) { + return; + } + + if (type =3D=3D SVM_EXIT_MSR) { + /* FIXME: this should be read in at vmrun (faster this way?) */ + uint64_t addr =3D x86_ldq_phys(cs, env->vm_vmcb + + offsetof(struct vmcb, + control.msrpm_base_pa)); + uint32_t t0, t1; + + switch ((uint32_t)env->regs[R_ECX]) { + case 0 ... 0x1fff: + t0 =3D (env->regs[R_ECX] * 2) % 8; + t1 =3D (env->regs[R_ECX] * 2) / 8; + break; + case 0xc0000000 ... 0xc0001fff: + t0 =3D (8192 + env->regs[R_ECX] - 0xc0000000) * 2; + t1 =3D (t0 / 8); + t0 %=3D 8; + break; + case 0xc0010000 ... 0xc0011fff: + t0 =3D (16384 + env->regs[R_ECX] - 0xc0010000) * 2; + t1 =3D (t0 / 8); + t0 %=3D 8; + break; + default: + cpu_vmexit(env, type, param, retaddr); + t0 =3D 0; + t1 =3D 0; + break; + } + if (x86_ldub_phys(cs, addr + t1) & ((1 << param) << t0)) { + cpu_vmexit(env, type, param, retaddr); + } + return; + } + + cpu_vmexit(env, type, param, retaddr); } =20 void helper_svm_check_intercept(CPUX86State *env, uint32_t type) --=20 2.25.1 From nobody Sat May 4 20:52:41 2024 Delivered-To: importer2@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer2=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1623847411; cv=none; d=zohomail.com; s=zohoarc; b=EGJXbdmFKemiZ/xn9nzg4i3bNGpE+MRExwDCL6JWYDq+izx4qvvldw1BDviiQzbYO4JziKrWSC/SqTtZl7OU0rnLBVT1HNdz3iBi/+q+PcFpP6vebIdwmRTkjFb8e14xlnVDm4HkCeulgFNgOGwLJL4GlxqG1XdFdYFcwc96iHA= ARC-Message-Signature: i=1; a=rsa-sha256; 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Wed, 16 Jun 2021 05:39:10 -0700 (PDT) From: Lara Lazier To: qemu-devel@nongnu.org Subject: [PATCH v2 2/4] target/i386: Added consistency checks for VMRUN intercept and ASID Date: Wed, 16 Jun 2021 14:39:05 +0200 Message-Id: <20210616123907.17765-3-laramglazier@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210616123907.17765-1-laramglazier@gmail.com> References: <20210616123907.17765-1-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+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::329; envelope-from=laramglazier@gmail.com; helo=mail-wm1-x329.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: Lara Lazier Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) Content-Type: text/plain; charset="utf-8" Zero VMRUN intercept and ASID should cause an immediate VMEXIT during the consistency checks performed by VMRUN. (AMD64 Architecture Programmer's Manual, V2, 15.5) Signed-off-by: Lara Lazier --- target/i386/tcg/sysemu/svm_helper.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/target/i386/tcg/sysemu/svm_helper.c b/target/i386/tcg/sysemu/s= vm_helper.c index 2f7606bebf..902bf03fc3 100644 --- a/target/i386/tcg/sysemu/svm_helper.c +++ b/target/i386/tcg/sysemu/svm_helper.c @@ -72,6 +72,7 @@ void helper_vmrun(CPUX86State *env, int aflag, int next_e= ip_addend) uint64_t nested_ctl; uint32_t event_inj; uint32_t int_ctl; + uint32_t asid; =20 cpu_svm_check_intercept_param(env, SVM_EXIT_VMRUN, 0, GETPC()); =20 @@ -154,9 +155,18 @@ void helper_vmrun(CPUX86State *env, int aflag, int nex= t_eip_addend) =20 nested_ctl =3D x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, control.nested_c= tl)); + asid =3D x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, + control.asid)); =20 env->nested_pg_mode =3D 0; =20 + if (!cpu_svm_has_intercept(env, SVM_EXIT_VMRUN)) { + cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC()); + } + if (asid =3D=3D 0) { + cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC()); + } + if (nested_ctl & SVM_NPT_ENABLED) { env->nested_cr3 =3D x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, --=20 2.25.1 From nobody Sat May 4 20:52:41 2024 Delivered-To: importer2@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer2=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1623847408; cv=none; d=zohomail.com; s=zohoarc; b=e/UAYb0Yg13FlaFigBlOplJh/AWVSUPT68+MD209cIonI2fcRNLfUJT1MdjGnHS8goXRHs6rbPNgwqBmH6vapUMDgaRbO1vrz0JFx5Nx/Jr9UC7uO/hQ9W2vEMI5Er63N34H4SzCFBzXwHBDBaxZfv5EpI9kG8jBHgvV5YX9CgY= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1623847408; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; 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envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::42d; envelope-from=laramglazier@gmail.com; helo=mail-wr1-x42d.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: Lara Lazier Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) Content-Type: text/plain; charset="utf-8" The combination of unset CD and set NW bit in CR0 is illegal. CR0[63:32] are also reserved and need to be zero. (AMD64 Architecture Programmer's Manual, V2, 15.5) Signed-off-by: Lara Lazier --- target/i386/cpu.h | 2 ++ target/i386/svm.h | 2 ++ target/i386/tcg/sysemu/svm_helper.c | 12 +++++++++--- 3 files changed, 13 insertions(+), 3 deletions(-) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 59b9231ee2..6b9d04b33e 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -224,6 +224,8 @@ typedef enum X86Seg { #define CR0_NE_MASK (1U << 5) #define CR0_WP_MASK (1U << 16) #define CR0_AM_MASK (1U << 18) +#define CR0_NW_MASK (1U << 29) +#define CR0_CD_MASK (1U << 30) #define CR0_PG_MASK (1U << 31) =20 #define CR4_VME_MASK (1U << 0) diff --git a/target/i386/svm.h b/target/i386/svm.h index 87965e5bc2..5098733053 100644 --- a/target/i386/svm.h +++ b/target/i386/svm.h @@ -135,6 +135,8 @@ #define SVM_NPTEXIT_GPA (1ULL << 32) #define SVM_NPTEXIT_GPT (1ULL << 33) =20 +#define SVM_CR0_RESERVED_MASK 0xffffffff00000000U + struct QEMU_PACKED vmcb_control_area { uint16_t intercept_cr_read; uint16_t intercept_cr_write; diff --git a/target/i386/tcg/sysemu/svm_helper.c b/target/i386/tcg/sysemu/s= vm_helper.c index 902bf03fc3..1c2dbc1862 100644 --- a/target/i386/tcg/sysemu/svm_helper.c +++ b/target/i386/tcg/sysemu/svm_helper.c @@ -73,6 +73,7 @@ void helper_vmrun(CPUX86State *env, int aflag, int next_e= ip_addend) uint32_t event_inj; uint32_t int_ctl; uint32_t asid; + uint64_t new_cr0; =20 cpu_svm_check_intercept_param(env, SVM_EXIT_VMRUN, 0, GETPC()); =20 @@ -192,13 +193,18 @@ void helper_vmrun(CPUX86State *env, int aflag, int ne= xt_eip_addend) env->idt.limit =3D x86_ldl_phys(cs, env->vm_vmcb + offsetof(struct vmc= b, save.idtr.limit)); =20 + new_cr0 =3D x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save= .cr0)); + if (new_cr0 & SVM_CR0_RESERVED_MASK) { + cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC()); + } + if ((new_cr0 & CR0_NW_MASK) && !(new_cr0 & CR0_CD_MASK)) { + cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC()); + } /* clear exit_info_2 so we behave like the real hardware */ x86_stq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, control.exit_info_2), 0); =20 - cpu_x86_update_cr0(env, x86_ldq_phys(cs, - env->vm_vmcb + offsetof(struct vmcb, - save.cr0))); + cpu_x86_update_cr0(env, new_cr0); cpu_x86_update_cr4(env, x86_ldq_phys(cs, env->vm_vmcb + offsetof(struct vmcb, save.cr4))); --=20 2.25.1 From nobody Sat May 4 20:52:41 2024 Delivered-To: importer2@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer2=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1623847306; cv=none; d=zohomail.com; s=zohoarc; b=k7t4hbGw2UdHn2fR4HKOBeQ/2wn0cDHUDXY+Welx5ZfJzOrrlEwM1+DyTNO4AtyC9bjxRlfFhAqRABD2a37REKVsDfXaIgrgZoWxpowM9rfrpss+/rhj4mTQdJ6FaZSqfv7myREvhVXaqqfbSCQ0LAvZgUnM+MHfoPkHfWhBv6c= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1623847306; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; 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envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::429; envelope-from=laramglazier@gmail.com; helo=mail-wr1-x429.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: Lara Lazier Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) Content-Type: text/plain; charset="utf-8" When the selective CR0 write intercept is set, all writes to bits in CR0 other than CR0.TS or CR0.MP cause a VMEXIT. Signed-off-by: Lara Lazier --- target/i386/tcg/sysemu/misc_helper.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/target/i386/tcg/sysemu/misc_helper.c b/target/i386/tcg/sysemu/= misc_helper.c index 0cef2f1a4c..db0d8a9d79 100644 --- a/target/i386/tcg/sysemu/misc_helper.c +++ b/target/i386/tcg/sysemu/misc_helper.c @@ -84,6 +84,15 @@ void helper_write_crN(CPUX86State *env, int reg, target_= ulong t0) { switch (reg) { case 0: + /* + * If we reach this point, the CR0 write intercept is disabled. + * But we could still exit if the hypervisor has requested the sele= ctive + * intercept for bits other than TS and MP + */ + if (cpu_svm_has_intercept(env, SVM_EXIT_CR0_SEL_WRITE) && + ((env->cr[0] ^ t0) & ~(CR0_TS_MASK | CR0_MP_MASK))) { + cpu_vmexit(env, SVM_EXIT_CR0_SEL_WRITE, 0, GETPC()); + } cpu_x86_update_cr0(env, t0); break; case 3: --=20 2.25.1