From: Joerg Roedel <joro@8bytes.org>
To: x86@kernel.org
Cc: Juergen Gross <jgross@suse.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Joerg Roedel <jroedel@suse.de>, Mike Stunes <mstunes@vmware.com>,
Kees Cook <keescook@chromium.org>,
kvm@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
Cfir Cohen <cfir@google.com>, Joerg Roedel <joro@8bytes.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
linux-kernel@vger.kernel.org,
Sean Christopherson <sean.j.christopherson@intel.com>,
virtualization@lists.linux-foundation.org,
Martin Radev <martin.b.radev@gmail.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
hpa@zytor.com, Erdem Aktas <erdemaktas@google.com>,
David Rientjes <rientjes@google.com>,
Dan Williams <dan.j.williams@intel.com>,
Jiri Slaby <jslaby@suse.cz>
Subject: [PATCH v4 39/75] x86/sev-es: Compile early handler code into kernel image
Date: Tue, 14 Jul 2020 14:08:41 +0200 [thread overview]
Message-ID: <20200714120917.11253-40-joro@8bytes.org> (raw)
In-Reply-To: <20200714120917.11253-1-joro@8bytes.org>
From: Joerg Roedel <jroedel@suse.de>
Setup sev-es.c and include the code from the
pre-decompression stage to also build it into the image of the running
kernel. Temporarily add __maybe_unused annotations to avoid build
warnings until the functions get used.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/sev-es-shared.c | 21 ++--
arch/x86/kernel/sev-es.c | 163 ++++++++++++++++++++++++++++++++
3 files changed, 175 insertions(+), 10 deletions(-)
create mode 100644 arch/x86/kernel/sev-es.c
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 1b166b866059..81276033a80e 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -149,6 +149,7 @@ obj-$(CONFIG_UNWINDER_ORC) += unwind_orc.o
obj-$(CONFIG_UNWINDER_FRAME_POINTER) += unwind_frame.o
obj-$(CONFIG_UNWINDER_GUESS) += unwind_guess.o
+obj-$(CONFIG_AMD_MEM_ENCRYPT) += sev-es.o
###
# 64 bit specific files
ifeq ($(CONFIG_X86_64),y)
diff --git a/arch/x86/kernel/sev-es-shared.c b/arch/x86/kernel/sev-es-shared.c
index 59884926fae5..df6750aef3c8 100644
--- a/arch/x86/kernel/sev-es-shared.c
+++ b/arch/x86/kernel/sev-es-shared.c
@@ -9,7 +9,7 @@
* and is included directly into both code-bases.
*/
-static void sev_es_terminate(unsigned int reason)
+static void __maybe_unused sev_es_terminate(unsigned int reason)
{
u64 val = GHCB_SEV_TERMINATE;
@@ -27,7 +27,7 @@ static void sev_es_terminate(unsigned int reason)
asm volatile("hlt\n" : : : "memory");
}
-static bool sev_es_negotiate_protocol(void)
+static bool __maybe_unused sev_es_negotiate_protocol(void)
{
u64 val;
@@ -46,7 +46,7 @@ static bool sev_es_negotiate_protocol(void)
return true;
}
-static void vc_ghcb_invalidate(struct ghcb *ghcb)
+static void __maybe_unused vc_ghcb_invalidate(struct ghcb *ghcb)
{
memset(ghcb->save.valid_bitmap, 0, sizeof(ghcb->save.valid_bitmap));
}
@@ -58,9 +58,9 @@ static bool vc_decoding_needed(unsigned long exit_code)
exit_code <= SVM_EXIT_LAST_EXCP);
}
-static enum es_result vc_init_em_ctxt(struct es_em_ctxt *ctxt,
- struct pt_regs *regs,
- unsigned long exit_code)
+static enum es_result __maybe_unused vc_init_em_ctxt(struct es_em_ctxt *ctxt,
+ struct pt_regs *regs,
+ unsigned long exit_code)
{
enum es_result ret = ES_OK;
@@ -73,7 +73,7 @@ static enum es_result vc_init_em_ctxt(struct es_em_ctxt *ctxt,
return ret;
}
-static void vc_finish_insn(struct es_em_ctxt *ctxt)
+static void __maybe_unused vc_finish_insn(struct es_em_ctxt *ctxt)
{
ctxt->regs->ip += ctxt->insn.length;
}
@@ -325,7 +325,8 @@ static enum es_result vc_ioio_exitinfo(struct es_em_ctxt *ctxt, u64 *exitinfo)
return ES_OK;
}
-static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
+static enum es_result __maybe_unused
+vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
{
struct pt_regs *regs = ctxt->regs;
u64 exit_info_1, exit_info_2;
@@ -433,8 +434,8 @@ static enum es_result vc_handle_ioio(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
return ret;
}
-static enum es_result vc_handle_cpuid(struct ghcb *ghcb,
- struct es_em_ctxt *ctxt)
+static enum es_result __maybe_unused vc_handle_cpuid(struct ghcb *ghcb,
+ struct es_em_ctxt *ctxt)
{
struct pt_regs *regs = ctxt->regs;
u32 cr4 = native_read_cr4();
diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
new file mode 100644
index 000000000000..0b698b653c0b
--- /dev/null
+++ b/arch/x86/kernel/sev-es.c
@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMD Memory Encryption Support
+ *
+ * Copyright (C) 2019 SUSE
+ *
+ * Author: Joerg Roedel <jroedel@suse.de>
+ */
+
+#include <linux/kernel.h>
+#include <linux/mm.h>
+
+#include <asm/sev-es.h>
+#include <asm/insn-eval.h>
+#include <asm/fpu/internal.h>
+#include <asm/processor.h>
+#include <asm/trap_pf.h>
+#include <asm/trapnr.h>
+#include <asm/svm.h>
+
+static inline u64 sev_es_rd_ghcb_msr(void)
+{
+ return native_read_msr(MSR_AMD64_SEV_ES_GHCB);
+}
+
+static inline void sev_es_wr_ghcb_msr(u64 val)
+{
+ u32 low, high;
+
+ low = (u32)(val);
+ high = (u32)(val >> 32);
+
+ native_write_msr(MSR_AMD64_SEV_ES_GHCB, low, high);
+}
+
+static int vc_fetch_insn_kernel(struct es_em_ctxt *ctxt,
+ unsigned char *buffer)
+{
+ return copy_from_kernel_nofault(buffer, (unsigned char *)ctxt->regs->ip, MAX_INSN_SIZE);
+}
+
+static enum es_result vc_decode_insn(struct es_em_ctxt *ctxt)
+{
+ char buffer[MAX_INSN_SIZE];
+ enum es_result ret;
+ int res;
+
+ res = vc_fetch_insn_kernel(ctxt, buffer);
+ if (unlikely(res == -EFAULT)) {
+ ctxt->fi.vector = X86_TRAP_PF;
+ ctxt->fi.error_code = 0;
+ ctxt->fi.cr2 = ctxt->regs->ip;
+ return ES_EXCEPTION;
+ }
+
+ insn_init(&ctxt->insn, buffer, MAX_INSN_SIZE - res, 1);
+ insn_get_length(&ctxt->insn);
+
+ ret = ctxt->insn.immediate.got ? ES_OK : ES_DECODE_FAILED;
+
+ return ret;
+}
+
+static enum es_result vc_write_mem(struct es_em_ctxt *ctxt,
+ char *dst, char *buf, size_t size)
+{
+ unsigned long error_code = X86_PF_PROT | X86_PF_WRITE;
+ char __user *target = (char __user *)dst;
+ u64 d8;
+ u32 d4;
+ u16 d2;
+ u8 d1;
+
+ switch (size) {
+ case 1:
+ memcpy(&d1, buf, 1);
+ if (put_user(d1, target))
+ goto fault;
+ break;
+ case 2:
+ memcpy(&d2, buf, 2);
+ if (put_user(d2, target))
+ goto fault;
+ break;
+ case 4:
+ memcpy(&d4, buf, 4);
+ if (put_user(d4, target))
+ goto fault;
+ break;
+ case 8:
+ memcpy(&d8, buf, 8);
+ if (put_user(d8, target))
+ goto fault;
+ break;
+ default:
+ WARN_ONCE(1, "%s: Invalid size: %zu\n", __func__, size);
+ return ES_UNSUPPORTED;
+ }
+
+ return ES_OK;
+
+fault:
+ if (user_mode(ctxt->regs))
+ error_code |= X86_PF_USER;
+
+ ctxt->fi.vector = X86_TRAP_PF;
+ ctxt->fi.error_code = error_code;
+ ctxt->fi.cr2 = (unsigned long)dst;
+
+ return ES_EXCEPTION;
+}
+
+static enum es_result vc_read_mem(struct es_em_ctxt *ctxt,
+ char *src, char *buf, size_t size)
+{
+ unsigned long error_code = X86_PF_PROT;
+ char __user *s = (char __user *)src;
+ u64 d8;
+ u32 d4;
+ u16 d2;
+ u8 d1;
+
+ switch (size) {
+ case 1:
+ if (get_user(d1, s))
+ goto fault;
+ memcpy(buf, &d1, 1);
+ break;
+ case 2:
+ if (get_user(d2, s))
+ goto fault;
+ memcpy(buf, &d2, 2);
+ break;
+ case 4:
+ if (get_user(d4, s))
+ goto fault;
+ memcpy(buf, &d4, 4);
+ break;
+ case 8:
+ if (get_user(d8, s))
+ goto fault;
+ memcpy(buf, &d8, 8);
+ break;
+ default:
+ WARN_ONCE(1, "%s: Invalid size: %zu\n", __func__, size);
+ return ES_UNSUPPORTED;
+ }
+
+ return ES_OK;
+
+fault:
+ if (user_mode(ctxt->regs))
+ error_code |= X86_PF_USER;
+
+ ctxt->fi.vector = X86_TRAP_PF;
+ ctxt->fi.error_code = error_code;
+ ctxt->fi.cr2 = (unsigned long)src;
+
+ return ES_EXCEPTION;
+}
+
+/* Include code shared with pre-decompression boot stage */
+#include "sev-es-shared.c"
--
2.27.0
next prev parent reply other threads:[~2020-07-14 12:08 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-14 12:08 [PATCH v4 00/75] x86: SEV-ES Guest Support Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 01/75] KVM: SVM: Add GHCB definitions Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 02/75] KVM: SVM: Add GHCB Accessor functions Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 03/75] KVM: SVM: Use __packed shorthand Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 04/75] x86/cpufeatures: Add SEV-ES CPU feature Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 05/75] x86/traps: Move pf error codes to <asm/trap_pf.h> Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 06/75] x86/insn: Make inat-tables.c suitable for pre-decompression code Joerg Roedel
2020-07-17 13:58 ` Masami Hiramatsu
2020-07-14 12:08 ` [PATCH v4 07/75] x86/umip: Factor out instruction fetch Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 08/75] x86/umip: Factor out instruction decoding Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 09/75] x86/insn: Add insn_get_modrm_reg_off() Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 10/75] x86/insn: Add insn_has_rep_prefix() helper Joerg Roedel
2020-07-17 14:06 ` Masami Hiramatsu
2020-07-14 12:08 ` [PATCH v4 11/75] x86/boot/compressed/64: Disable red-zone usage Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 12/75] x86/boot/compressed/64: Add IDT Infrastructure Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 13/75] x86/boot/compressed/64: Rename kaslr_64.c to ident_map_64.c Joerg Roedel
2020-07-15 1:23 ` Kees Cook
2020-07-14 12:08 ` [PATCH v4 14/75] x86/boot/compressed/64: Add page-fault handler Joerg Roedel
2020-07-15 1:24 ` Kees Cook
2020-07-14 12:08 ` [PATCH v4 15/75] x86/boot/compressed/64: Always switch to own page-table Joerg Roedel
2020-07-15 1:23 ` Kees Cook
2020-07-14 12:08 ` [PATCH v4 16/75] x86/boot/compressed/64: Don't pre-map memory in KASLR code Joerg Roedel
2020-07-15 1:24 ` Kees Cook
2020-07-14 12:08 ` [PATCH v4 17/75] x86/boot/compressed/64: Change add_identity_map() to take start and end Joerg Roedel
2020-07-15 1:24 ` Kees Cook
2020-07-14 12:08 ` [PATCH v4 18/75] x86/boot/compressed/64: Add stage1 #VC handler Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 19/75] x86/boot/compressed/64: Call set_sev_encryption_mask earlier Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 20/75] x86/boot/compressed/64: Check return value of kernel_ident_mapping_init() Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 21/75] x86/boot/compressed/64: Add set_page_en/decrypted() helpers Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 22/75] x86/boot/compressed/64: Setup GHCB Based VC Exception handler Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 23/75] x86/boot/compressed/64: Unmap GHCB page before booting the kernel Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 24/75] x86/sev-es: Add support for handling IOIO exceptions Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 25/75] x86/fpu: Move xgetbv()/xsetbv() into separate header Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 26/75] x86/sev-es: Add CPUID handling to #VC handler Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 27/75] x86/idt: Move IDT to data segment Joerg Roedel
2020-07-15 1:25 ` Kees Cook
2020-07-14 12:08 ` [PATCH v4 28/75] x86/idt: Split idt_data setup out of set_intr_gate() Joerg Roedel
2020-07-15 1:26 ` Kees Cook
2020-07-14 12:08 ` [PATCH v4 29/75] x86/idt: Move two function from k/idt.c to i/a/desc.h Joerg Roedel
2020-07-15 1:29 ` Kees Cook
2020-07-14 12:08 ` [PATCH v4 30/75] x86/head/64: Install boot GDT Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 31/75] x86/head/64: Reload GDT after switch to virtual addresses Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 32/75] x86/head/64: Load segment registers earlier Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 33/75] x86/head/64: Switch to initial stack earlier Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 34/75] x86/head/64: Build k/head64.c with -fno-stack-protector Joerg Roedel
2020-07-15 1:34 ` Kees Cook
2020-07-15 16:34 ` Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 35/75] x86/head/64: Load IDT earlier Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 36/75] x86/head/64: Move early exception dispatch to C code Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 37/75] x86/sev-es: Add SEV-ES Feature Detection Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 38/75] x86/sev-es: Print SEV-ES info into kernel log Joerg Roedel
2020-07-14 12:08 ` Joerg Roedel [this message]
2020-07-14 12:08 ` [PATCH v4 40/75] x86/sev-es: Setup early #VC handler Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 41/75] x86/sev-es: Setup GHCB based boot " Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 42/75] x86/sev-es: Setup per-cpu GHCBs for the runtime handler Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 43/75] x86/sev-es: Allocate and Map stacks for #VC handler Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 44/75] x86/sev-es: Allocate and setup IST entry for #VC Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 45/75] x86/sev-es: Adjust #VC IST Stack on entering NMI handler Joerg Roedel
2020-07-15 9:47 ` Peter Zijlstra
2020-07-15 10:26 ` Joerg Roedel
2020-07-15 10:56 ` Peter Zijlstra
2020-07-14 12:08 ` [PATCH v4 46/75] x86/dumpstack/64: Add noinstr version of get_stack_info() Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 47/75] x86/entry/64: Add entry code for #VC handler Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 48/75] x86/sev-es: Add Runtime #VC Exception Handler Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 49/75] x86/sev-es: Wire up existing #VC exit-code handlers Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 50/75] x86/sev-es: Handle instruction fetches from user-space Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 51/75] x86/sev-es: Handle MMIO events Joerg Roedel
2020-07-21 21:01 ` Mike Stunes
2020-07-22 7:55 ` Joerg Roedel
2020-07-22 8:05 ` Joerg Roedel
2020-07-22 22:53 ` Mike Stunes
2020-07-23 7:21 ` Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 52/75] x86/sev-es: Handle MMIO String Instructions Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 53/75] x86/sev-es: Handle MSR events Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 54/75] x86/sev-es: Handle DR7 read/write events Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 55/75] x86/sev-es: Handle WBINVD Events Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 56/75] x86/sev-es: Handle RDTSC(P) Events Joerg Roedel
2020-07-14 12:08 ` [PATCH v4 57/75] x86/sev-es: Handle RDPMC Events Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 58/75] x86/sev-es: Handle INVD Events Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 59/75] x86/sev-es: Handle MONITOR/MONITORX Events Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 60/75] x86/sev-es: Handle MWAIT/MWAITX Events Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 61/75] x86/sev-es: Handle VMMCALL Events Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 62/75] x86/sev-es: Handle #AC Events Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 63/75] x86/sev-es: Handle #DB Events Joerg Roedel
2020-07-15 8:47 ` Peter Zijlstra
2020-07-15 9:13 ` Joerg Roedel
2020-07-15 9:51 ` Peter Zijlstra
2020-07-15 10:08 ` Joerg Roedel
2020-07-15 10:13 ` Peter Zijlstra
2020-07-15 10:31 ` Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 64/75] x86/paravirt: Allow hypervisor specific VMMCALL handling under SEV-ES Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 65/75] x86/kvm: Add KVM " Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 66/75] x86/vmware: Add VMware specific handling for VMMCALL " Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 67/75] x86/realmode: Add SEV-ES specific trampoline entry point Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 68/75] x86/realmode: Setup AP jump table Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 69/75] x86/head/64: Setup TSS early for secondary CPUs Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 70/75] x86/head/64: Don't call verify_cpu() on starting APs Joerg Roedel
2020-07-15 1:40 ` Kees Cook
2020-07-15 9:26 ` Joerg Roedel
2020-07-15 15:26 ` Kees Cook
2020-07-15 15:48 ` Joerg Roedel
2020-07-15 19:49 ` Kees Cook
2020-07-20 15:29 ` Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 71/75] x86/head/64: Rename start_cpu0 Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 72/75] x86/sev-es: Support CPU offline/online Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 73/75] x86/sev-es: Handle NMI State Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 74/75] x86/efi: Add GHCB mappings when SEV-ES is active Joerg Roedel
2020-07-14 12:09 ` [PATCH v4 75/75] x86/sev-es: Check required CPU features for SEV-ES Joerg Roedel
2020-07-15 9:24 ` [PATCH v4 00/75] x86: SEV-ES Guest Support Peter Zijlstra
2020-07-15 9:34 ` Joerg Roedel
2020-07-15 9:55 ` Peter Zijlstra
2020-07-15 10:10 ` Joerg Roedel
2020-07-21 1:09 ` Erdem Aktas
2020-07-21 12:49 ` Joerg Roedel
2020-07-21 16:48 ` Erdem Aktas
2020-07-22 9:04 ` Joerg Roedel
2020-07-22 16:54 ` Erdem Aktas
2020-07-22 17:45 ` Joerg Roedel
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