From patchwork Thu Mar 7 21:29:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Makhalov X-Patchwork-Id: 778692 Received: from mail-pf1-f176.google.com (mail-pf1-f176.google.com [209.85.210.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CD35C14373F for ; Thu, 7 Mar 2024 21:30:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709847017; cv=none; b=E7qAt/AmFVSem0zHQ56Od9/azUAWIsKRBtc/xZVgB6sivEysX7+rySlEOorEajdg3uzxJQvMlWCvgv/wWZZcLZ3fQHlR9fYMHYJIkBuOyG38jIX+uP65JLe+QPVnVd6Pk4HhIIAYHRfvpkeE6NclMDHPdmNy/tY1qEfCRz9SWeI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709847017; c=relaxed/simple; bh=uvXRQzVDVySpdmyTqAw3zeM7QrwQGclRjrSl2B8XVt8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=aHWnJqvj4SUki6tjqHxO6QIjw/8yDIfX645al07U95C3EI/NSKRWeZPV4NN6g97ljvTuwGiLCcyc+3MIAHZ4YqT1UC4U1iLgDfN6aU+u6sFmF1BIoFyD8u4rO7XsznusqwxqpxetsD5xxNTsf3xlfevOPE74aEqiyfZpbjoVq+U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com; spf=fail smtp.mailfrom=broadcom.com; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b=S/v5Le/c; arc=none smtp.client-ip=209.85.210.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=broadcom.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=broadcom.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="S/v5Le/c" Received: by mail-pf1-f176.google.com with SMTP id d2e1a72fcca58-6e622b46f45so160361b3a.1 for ; Thu, 07 Mar 2024 13:30:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1709847015; x=1710451815; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=6RtHyaEuKpL9REXgkKi1O83Oy76Ia+vzTTF2nxsG3Eg=; b=S/v5Le/cHh5R8A1+fOxYUBYFbXNCx+mbKvfgDE2JPp5nQiWMkyzxKJVNlEI0Jw/wqw jaPu+0qu3Fnv+w+MhjdLLqj15UUuuTVw0AUiZp4FlBhUEEMmd9gLOOrXnMjyKoJdGJVb krGHi5cIIOW9gJ/mn9D8JpqshWX37cUtYVLlQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1709847015; x=1710451815; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=6RtHyaEuKpL9REXgkKi1O83Oy76Ia+vzTTF2nxsG3Eg=; b=U9vAAQxgtGHFGAFAiwmCWOPsC5e4ZVXjQM8ONw2bmeSZJACYw9SJYuptjkq+80r8wg +WDLL3akTtROyrsyDapdVWTKxO32Nml3Bg/3QUjCcnoDcV8iqyrL8sy7f1+K2tuFHtWj pIMpvpKVEXH8mVMyTeEvonq+MZlu3IRd+60Bok3MWnNcGq5lRTfGYzqE04JPS7d98caB fclzbsMr46jYXfiUYjR3whjoWFUtOH/yslGB7SQQU3p66jCHwY1cymubYvCxuZjztVU4 lNxiEJFLSipxCqI79L6CtYJ6xzLRqVlrpVoz+ncVwT2btPB1KQwmP5/VW6HSEEYdzanQ 61kg== X-Forwarded-Encrypted: i=1; AJvYcCUpfu4IEURRCQnpUzjSZk3fDC1qAYe0v28O1bAU1RZ6SvGR3+gjTDnMyx6y34ImkzISAAvrUmumfQ+/Vg56FKqYCyCYwZPeDXpqoKw= X-Gm-Message-State: AOJu0YzY/MPNCBhIvwkwS+SfV9chviwQFA3xwCEsnsyNhLcZnmvYJBxX RNdF8nex9rkpWNlinaJUXtH25gDi14QLiz37TB+6HqxnQMhsJ1VDtfe+WYjELg== X-Google-Smtp-Source: AGHT+IEe1+yzLKJSveqhdFYNAAv4qE4x7I+SN2Zb4STJDfDRzYWS0H6VLGXFcZcTlLzZG8XimgW21Q== X-Received: by 2002:a05:6a20:3c88:b0:1a0:ceb1:8f65 with SMTP id b8-20020a056a203c8800b001a0ceb18f65mr9795630pzj.4.1709847015125; Thu, 07 Mar 2024 13:30:15 -0800 (PST) Received: from amakhalov-build-vm.eng.vmware.com ([64.186.27.43]) by smtp.gmail.com with ESMTPSA id y12-20020a17090abd0c00b00299db19a81asm1991021pjr.56.2024.03.07.13.30.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Mar 2024 13:30:14 -0800 (PST) From: Alexey Makhalov To: linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, mingo@redhat.com, tglx@linutronix.de Cc: x86@kernel.org, netdev@vger.kernel.org, richardcochran@gmail.com, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, zackr@vmware.com, linux-graphics-maintainer@vmware.com, pv-drivers@vmware.com, namit@vmware.com, timothym@vmware.com, akaher@vmware.com, jsipek@vmware.com, dri-devel@lists.freedesktop.org, daniel@ffwll.ch, airlied@gmail.com, tzimmermann@suse.de, mripard@kernel.org, maarten.lankhorst@linux.intel.com, horms@kernel.org, kirill.shutemov@linux.intel.com Subject: [PATCH v7 7/7] x86/vmware: Add TDX hypercall support Date: Thu, 7 Mar 2024 13:29:49 -0800 Message-Id: <20240307212949.4166120-8-alexey.makhalov@broadcom.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20240307212949.4166120-1-alexey.makhalov@broadcom.com> References: <20240307212949.4166120-1-alexey.makhalov@broadcom.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Alexey Makhalov VMware hypercalls use I/O port, VMCALL or VMMCALL instructions. Add __tdx_hypercall path to support TDX guests. No change in high bandwidth hypercalls, as only low bandwidth ones are supported for TDX guests. Co-developed-by: Tim Merrifield Signed-off-by: Tim Merrifield Signed-off-by: Alexey Makhalov Reviewed-by: Nadav Amit Acked-by: Kirill A. Shutemov Acked-by: Dave Hansen --- arch/x86/include/asm/vmware.h | 46 +++++++++++++++++++++++++++++++ arch/x86/kernel/cpu/vmware.c | 52 +++++++++++++++++++++++++++++++++++ 2 files changed, 98 insertions(+) diff --git a/arch/x86/include/asm/vmware.h b/arch/x86/include/asm/vmware.h index 84a31f579a30..cc79c14d1ac2 100644 --- a/arch/x86/include/asm/vmware.h +++ b/arch/x86/include/asm/vmware.h @@ -18,6 +18,12 @@ * arg2 - Hypercall command * arg3 bits [15:0] - Port number, LB and direction flags * + * - Low bandwidth TDX hypercalls (x86_64 only) are similar to LB + * hypercalls. They also have up to 6 input and 6 output on registers + * arguments, with different argument to register mapping: + * %r12 (arg0), %rbx (arg1), %r13 (arg2), %rdx (arg3), + * %rsi (arg4), %rdi (arg5). + * * - High bandwidth (HB) hypercalls are I/O port based only. They have * up to 7 input and 7 output arguments passed and returned using * registers: %eax (arg0), %ebx (arg1), %ecx (arg2), %edx (arg3), @@ -54,12 +60,28 @@ #define VMWARE_CMD_GETHZ 45 #define VMWARE_CMD_GETVCPU_INFO 68 #define VMWARE_CMD_STEALCLOCK 91 +/* + * Hypercall command mask: + * bits [6:0] command, range [0, 127] + * bits [19:16] sub-command, range [0, 15] + */ +#define VMWARE_CMD_MASK 0xf007fU #define CPUID_VMWARE_FEATURES_ECX_VMMCALL BIT(0) #define CPUID_VMWARE_FEATURES_ECX_VMCALL BIT(1) extern u8 vmware_hypercall_mode; +#define VMWARE_TDX_VENDOR_LEAF 0x1af7e4909ULL +#define VMWARE_TDX_HCALL_FUNC 1 + +extern unsigned long vmware_tdx_hypercall(unsigned long cmd, + unsigned long in1, unsigned long in3, + unsigned long in4, unsigned long in5, + uint32_t *out1, uint32_t *out2, + uint32_t *out3, uint32_t *out4, + uint32_t *out5); + /* * The low bandwidth call. The low word of %edx is presumed to have OUT bit * set. The high word of %edx may contain input data from the caller. @@ -87,6 +109,10 @@ unsigned long vmware_hypercall1(unsigned long cmd, unsigned long in1) { unsigned long out0; + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return vmware_tdx_hypercall(cmd, in1, 0, 0, 0, + NULL, NULL, NULL, NULL, NULL); + asm_inline volatile (VMWARE_HYPERCALL : "=a" (out0) : [port] "i" (VMWARE_HYPERVISOR_PORT), @@ -105,6 +131,10 @@ unsigned long vmware_hypercall3(unsigned long cmd, unsigned long in1, { unsigned long out0; + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return vmware_tdx_hypercall(cmd, in1, 0, 0, 0, + out1, out2, NULL, NULL, NULL); + asm_inline volatile (VMWARE_HYPERCALL : "=a" (out0), "=b" (*out1), "=c" (*out2) : [port] "i" (VMWARE_HYPERVISOR_PORT), @@ -124,6 +154,10 @@ unsigned long vmware_hypercall4(unsigned long cmd, unsigned long in1, { unsigned long out0; + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return vmware_tdx_hypercall(cmd, in1, 0, 0, 0, + out1, out2, out3, NULL, NULL); + asm_inline volatile (VMWARE_HYPERCALL : "=a" (out0), "=b" (*out1), "=c" (*out2), "=d" (*out3) : [port] "i" (VMWARE_HYPERVISOR_PORT), @@ -143,6 +177,10 @@ unsigned long vmware_hypercall5(unsigned long cmd, unsigned long in1, { unsigned long out0; + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return vmware_tdx_hypercall(cmd, in1, in3, in4, in5, + NULL, out2, NULL, NULL, NULL); + asm_inline volatile (VMWARE_HYPERCALL : "=a" (out0), "=c" (*out2) : [port] "i" (VMWARE_HYPERVISOR_PORT), @@ -165,6 +203,10 @@ unsigned long vmware_hypercall6(unsigned long cmd, unsigned long in1, { unsigned long out0; + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return vmware_tdx_hypercall(cmd, in1, in3, 0, 0, + NULL, out2, out3, out4, out5); + asm_inline volatile (VMWARE_HYPERCALL : "=a" (out0), "=c" (*out2), "=d" (*out3), "=S" (*out4), "=D" (*out5) @@ -186,6 +228,10 @@ unsigned long vmware_hypercall7(unsigned long cmd, unsigned long in1, { unsigned long out0; + if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) + return vmware_tdx_hypercall(cmd, in1, in3, in4, in5, + out1, out2, out3, NULL, NULL); + asm_inline volatile (VMWARE_HYPERCALL : "=a" (out0), "=b" (*out1), "=c" (*out2), "=d" (*out3) : [port] "i" (VMWARE_HYPERVISOR_PORT), diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c index 3aa1adaed18f..41309f03cb94 100644 --- a/arch/x86/kernel/cpu/vmware.c +++ b/arch/x86/kernel/cpu/vmware.c @@ -428,6 +428,58 @@ static bool __init vmware_legacy_x2apic_available(void) (eax & BIT(VCPU_LEGACY_X2APIC)); } +#ifdef CONFIG_INTEL_TDX_GUEST +/* + * TDCALL[TDG.VP.VMCALL] uses %rax (arg0) and %rcx (arg2). Therefore, + * we remap those registers to %r12 and %r13, respectively. + */ +unsigned long vmware_tdx_hypercall(unsigned long cmd, + unsigned long in1, unsigned long in3, + unsigned long in4, unsigned long in5, + uint32_t *out1, uint32_t *out2, + uint32_t *out3, uint32_t *out4, + uint32_t *out5) +{ + struct tdx_module_args args; + + if (!hypervisor_is_type(X86_HYPER_VMWARE)) { + pr_warn_once("Incorrect usage\n"); + return ULONG_MAX; + } + + if (cmd & ~VMWARE_CMD_MASK) { + pr_warn_once("Out of range command %lx\n", cmd); + return ULONG_MAX; + } + + args.rbx = in1; + args.rdx = in3; + args.rsi = in4; + args.rdi = in5; + args.r10 = VMWARE_TDX_VENDOR_LEAF; + args.r11 = VMWARE_TDX_HCALL_FUNC; + args.r12 = VMWARE_HYPERVISOR_MAGIC; + args.r13 = cmd; + args.r15 = 0; /* CPL */ + + __tdx_hypercall(&args); + + if (out1) + *out1 = args.rbx; + if (out2) + *out2 = args.r13; + if (out3) + *out3 = args.rdx; + if (out4) + *out4 = args.rsi; + if (out5) + *out5 = args.rdi; + + return args.r12; +} +EXPORT_SYMBOL_GPL(vmware_tdx_hypercall); +#endif + #ifdef CONFIG_AMD_MEM_ENCRYPT static void vmware_sev_es_hcall_prepare(struct ghcb *ghcb, struct pt_regs *regs)