From patchwork Wed Feb 7 17:26:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13548856 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EF98713666F; Wed, 7 Feb 2024 17:59:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707328769; cv=none; b=I6cVb0ZrSHFCKZphI/Wc5NXta+qs5duu/XT9teNBcT4jbZnxP1AD7GubBnZXEF8PO6jsj22NBfgddfcdaF5x4geJtjaWnMwFQ6FTfrXiLQIvgMCjLlCufuduEFiL8za3LF4vTmdNC1iFNPPW6IbBG0OfVWSVZio76mLDBoxAM8o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707328769; c=relaxed/simple; bh=WIt9o4OjjawnuBTk8GUkaHPSrfrC5St66G3/Ao7RYxg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dH2wJurC6EWjhQnfYXovyck33UiMvvLMCqjFfy0EcYBfzr+UF87jv50AatL25z93yB0kUPjHYDFO1WB0bJDqs3hI/gJI09fGyCLX7D7/zInsufuvE8FvBX7kb0XghykObddvgNBhIgByJY40T6dlEswmYyXUy+X0Sk4srv5JQc8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=chL9Ufci; arc=none smtp.client-ip=198.175.65.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="chL9Ufci" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1707328764; x=1738864764; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=WIt9o4OjjawnuBTk8GUkaHPSrfrC5St66G3/Ao7RYxg=; b=chL9UfciYEARhNzX3RpIWqvj6D4+Cnpcafj3AB/BPc3oxcDptRjjl6cu guPU1fd9LGA6Cl1RRETA9EmbOf8cXnPE0WvRPyIltZgTMmjcyIXsE9Fe1 Jr+sT/aJStSvzJQkTtpsOIwktbE5Da2x4cbGthkhLRV+srKU0BpCfwuIq Q5eBOoTPKmqGUBoXN+IoOTtpRSN8KgiRnxrCVbHWfpsfewxtYxcs+TA8l plkWyXqB7o335G2i7E1kAImTYsjH0GwMp2HyNXx23bXIDT983fN6fPMN1 lMv7yQ8OHis7KzyhuOgxUfauGSyD4kp7jNWyn/aMqgQS8M/dblou0BKOl w==; X-IronPort-AV: E=McAfee;i="6600,9927,10977"; a="11622692" X-IronPort-AV: E=Sophos;i="6.05,251,1701158400"; d="scan'208";a="11622692" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Feb 2024 09:59:00 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.05,251,1701158400"; d="scan'208";a="6020771" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmviesa004.fm.intel.com with ESMTP; 07 Feb 2024 09:58:59 -0800 From: Xin Li To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: seanjc@google.com, pbonzini@redhat.com, corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, shuah@kernel.org, vkuznets@redhat.com, peterz@infradead.org, ravi.v.shankar@intel.com, xin@zytor.com Subject: [PATCH v2 24/25] KVM: selftests: Add a new VM guest mode to run user level code Date: Wed, 7 Feb 2024 09:26:44 -0800 Message-ID: <20240207172646.3981-25-xin3.li@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240207172646.3981-1-xin3.li@intel.com> References: <20240207172646.3981-1-xin3.li@intel.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a new VM guest mode VM_MODE_PXXV48_4K_USER to set the user bit of guest page table entries, thus allow user level code to run in guests. Suggested-by: Sean Christopherson Signed-off-by: Xin Li --- .../testing/selftests/kvm/include/kvm_util_base.h | 1 + tools/testing/selftests/kvm/lib/kvm_util.c | 5 ++++- .../testing/selftests/kvm/lib/x86_64/processor.c | 15 ++++++++++----- tools/testing/selftests/kvm/lib/x86_64/vmx.c | 4 ++-- 4 files changed, 17 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index 9e5afc472c14..ea1a585ef6f4 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -187,6 +187,7 @@ enum vm_guest_mode { VM_MODE_P36V48_16K, VM_MODE_P36V48_64K, VM_MODE_P36V47_16K, + VM_MODE_PXXV48_4K_USER, /* For 48bits VA but ANY bits PA with USER bit set */ NUM_VM_MODES, }; diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index e066d584c656..8b4761836b3e 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -163,6 +163,7 @@ const char *vm_guest_mode_string(uint32_t i) [VM_MODE_P36V48_16K] = "PA-bits:36, VA-bits:48, 16K pages", [VM_MODE_P36V48_64K] = "PA-bits:36, VA-bits:48, 64K pages", [VM_MODE_P36V47_16K] = "PA-bits:36, VA-bits:47, 16K pages", + [VM_MODE_PXXV48_4K_USER] = "PA-bits:ANY, VA-bits:48, 4K user pages", }; _Static_assert(sizeof(strings)/sizeof(char *) == NUM_VM_MODES, "Missing new mode strings?"); @@ -189,6 +190,7 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = { [VM_MODE_P36V48_16K] = { 36, 48, 0x4000, 14 }, [VM_MODE_P36V48_64K] = { 36, 48, 0x10000, 16 }, [VM_MODE_P36V47_16K] = { 36, 47, 0x4000, 14 }, + [VM_MODE_PXXV48_4K_USER] = { 0, 0, 0x1000, 12 }, }; _Static_assert(sizeof(vm_guest_mode_params)/sizeof(struct vm_guest_mode_params) == NUM_VM_MODES, "Missing new mode params?"); @@ -263,6 +265,7 @@ struct kvm_vm *____vm_create(struct vm_shape shape) vm->pgtable_levels = 3; break; case VM_MODE_PXXV48_4K: + case VM_MODE_PXXV48_4K_USER: #ifdef __x86_64__ kvm_get_cpu_address_width(&vm->pa_bits, &vm->va_bits); /* @@ -278,7 +281,7 @@ struct kvm_vm *____vm_create(struct vm_shape shape) vm->pgtable_levels = 4; vm->va_bits = 48; #else - TEST_FAIL("VM_MODE_PXXV48_4K not supported on non-x86 platforms"); + TEST_FAIL("VM_MODE_PXXV48_4K(_USER) not supported on non-x86 platforms"); #endif break; case VM_MODE_P47V64_4K: diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index d8288374078e..a8e60641df53 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -124,8 +124,8 @@ bool kvm_is_tdp_enabled(void) void virt_arch_pgd_alloc(struct kvm_vm *vm) { - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " - "unknown or unsupported guest mode, mode: 0x%x", vm->mode); + TEST_ASSERT((vm->mode == VM_MODE_PXXV48_4K) || (vm->mode == VM_MODE_PXXV48_4K_USER), + "Attempt to use unknown or unsupported guest mode, mode: 0x%x", vm->mode); /* If needed, create page map l4 table. */ if (!vm->pgd_created) { @@ -159,6 +159,8 @@ static uint64_t *virt_create_upper_pte(struct kvm_vm *vm, if (!(*pte & PTE_PRESENT_MASK)) { *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK; + if (vm->mode == VM_MODE_PXXV48_4K_USER) + *pte |= PTE_USER_MASK; if (current_level == target_level) *pte |= PTE_LARGE_MASK | (paddr & PHYSICAL_PAGE_MASK); else @@ -185,7 +187,7 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int level) uint64_t *pml4e, *pdpe, *pde; uint64_t *pte; - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, + TEST_ASSERT((vm->mode == VM_MODE_PXXV48_4K) || (vm->mode == VM_MODE_PXXV48_4K_USER), "Unknown or unsupported guest mode, mode: 0x%x", vm->mode); TEST_ASSERT((vaddr % pg_size) == 0, @@ -222,6 +224,8 @@ void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int level) TEST_ASSERT(!(*pte & PTE_PRESENT_MASK), "PTE already present for 4k page at vaddr: 0x%lx\n", vaddr); *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK | (paddr & PHYSICAL_PAGE_MASK); + if (vm->mode == VM_MODE_PXXV48_4K_USER) + *pte |= PTE_USER_MASK; } void virt_arch_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr) @@ -268,8 +272,8 @@ uint64_t *__vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr, TEST_ASSERT(*level >= PG_LEVEL_NONE && *level < PG_LEVEL_NUM, "Invalid PG_LEVEL_* '%d'", *level); - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " - "unknown or unsupported guest mode, mode: 0x%x", vm->mode); + TEST_ASSERT((vm->mode == VM_MODE_PXXV48_4K) || (vm->mode == VM_MODE_PXXV48_4K_USER), + "Attempt to use unknown or unsupported guest mode, mode: 0x%x", vm->mode); TEST_ASSERT(sparsebit_is_set(vm->vpages_valid, (vaddr >> vm->page_shift)), "Invalid virtual address, vaddr: 0x%lx", @@ -536,6 +540,7 @@ static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu) switch (vm->mode) { case VM_MODE_PXXV48_4K: + case VM_MODE_PXXV48_4K_USER: sregs.cr0 = X86_CR0_PE | X86_CR0_NE | X86_CR0_PG; sregs.cr4 |= X86_CR4_PAE | X86_CR4_OSFXSR; sregs.efer |= (EFER_LME | EFER_LMA | EFER_NX); diff --git a/tools/testing/selftests/kvm/lib/x86_64/vmx.c b/tools/testing/selftests/kvm/lib/x86_64/vmx.c index 59d97531c9b1..65147de6f9c0 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/vmx.c +++ b/tools/testing/selftests/kvm/lib/x86_64/vmx.c @@ -403,8 +403,8 @@ void __nested_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm, struct eptPageTableEntry *pt = vmx->eptp_hva, *pte; uint16_t index; - TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use " - "unknown or unsupported guest mode, mode: 0x%x", vm->mode); + TEST_ASSERT((vm->mode == VM_MODE_PXXV48_4K) || (vm->mode == VM_MODE_PXXV48_4K_USER), + "Attempt to use unknown or unsupported guest mode, mode: 0x%x", vm->mode); TEST_ASSERT((nested_paddr >> 48) == 0, "Nested physical address 0x%lx requires 5-level paging",