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From: "Lendacky, Thomas" <thomas.lendacky@amd.com>
To: devel@edk2.groups.io
Cc: Jordan Justen <jordan.l.justen@intel.com>,
	Laszlo Ersek <lersek@redhat.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Michael D Kinney <michael.d.kinney@intel.com>,
	Liming Gao <liming.gao@intel.com>,
	Eric Dong <eric.dong@intel.com>, Ray Ni <ray.ni@intel.com>,
	Brijesh Singh <brijesh.singh@amd.com>
Subject: [PATCH v4 10/40] UefiCpuPkg/CpuExceptionHandler: Support string IO for IOIO_PROT NAE events
Date: Tue,  4 Feb 2020 17:01:14 -0600	[thread overview]
Message-ID: <ca5ccd0aaa07fce3083fc4fc7d5cc5ef8cb41cf6.1580857303.git.thomas.lendacky@amd.com> (raw)
In-Reply-To: <cover.1580857303.git.thomas.lendacky@amd.com>

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

Add support to the #VC exception handler to handle string IO. This
requires expanding the IO instruction parsing to recognize string based
IO instructions as well as preparing an un-encrypted buffer to be used
to transfer (either to or from the guest) the string contents for the IO
operation. The SW_EXITINFO2 and SW_SCRATCH fields of the GHCB are set
appropriately for the operation. Multiple VMGEXIT invocations may be
needed to complete the string IO operation.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 .../X64/AMDSevVcCommon.c                      | 78 ++++++++++++++++---
 1 file changed, 68 insertions(+), 10 deletions(-)

diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c
index 48eb5c2358ed..49609c5ef22f 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c
@@ -321,6 +321,22 @@ IoioExitInfo (
   UINT64  ExitInfo = 0;
 
   switch (*(InstructionData->OpCodes)) {
+  // INS opcodes
+  case 0x6C:
+  case 0x6D:
+    ExitInfo |= IOIO_TYPE_INS;
+    ExitInfo |= IOIO_SEG_ES;
+    ExitInfo |= ((Regs->Rdx & 0xffff) << 16);
+    break;
+
+  // OUTS opcodes
+  case 0x6E:
+  case 0x6F:
+    ExitInfo |= IOIO_TYPE_OUTS;
+    ExitInfo |= IOIO_SEG_DS;
+    ExitInfo |= ((Regs->Rdx & 0xffff) << 16);
+    break;
+
   // IN immediate opcodes
   case 0xE4:
   case 0xE5:
@@ -358,6 +374,8 @@ IoioExitInfo (
   }
 
   switch (*(InstructionData->OpCodes)) {
+  case 0x6C:
+  case 0x6E:
   case 0xE4:
   case 0xE6:
   case 0xEC:
@@ -404,7 +422,8 @@ IoioExit (
   SEV_ES_INSTRUCTION_DATA  *InstructionData
   )
 {
-  UINT64  ExitInfo1, Status;
+  UINT64   ExitInfo1, ExitInfo2, Status;
+  BOOLEAN  String;
 
   ExitInfo1 = IoioExitInfo (Regs, InstructionData);
   if (!ExitInfo1) {
@@ -421,16 +440,55 @@ IoioExit (
   Ghcb->SaveArea.Rax = Regs->Rax;
   GhcbSetRegValid (Ghcb, GhcbRax);
 
-  Status = VmgExit (Ghcb, SvmExitIoioProt, ExitInfo1, 0);
-  if (Status) {
-    return Status;
-  }
-
-  if (ExitInfo1 & IOIO_TYPE_IN) {
-    if (!GhcbIsRegValid (Ghcb, GhcbRax)) {
-      return UnsupportedExit (Ghcb, Regs, InstructionData);
+  String = (ExitInfo1 & IOIO_TYPE_STR) ? TRUE : FALSE;
+  if (String) {
+    UINTN  IoBytes, VmgExitBytes;
+    UINTN  GhcbCount, OpCount;
+
+    Status = 0;
+
+    IoBytes = (ExitInfo1 >> 4) & 0x7;
+    GhcbCount = sizeof (Ghcb->SharedBuffer) / IoBytes;
+
+    OpCount = (ExitInfo1 & IOIO_REP) ? Regs->Rcx : 1;
+    while (OpCount) {
+      ExitInfo2 = MIN (OpCount, GhcbCount);
+      VmgExitBytes = ExitInfo2 * IoBytes;
+
+      if (!(ExitInfo1 & IOIO_TYPE_IN)) {
+        CopyMem (Ghcb->SharedBuffer, (VOID *) Regs->Rsi, VmgExitBytes);
+        Regs->Rsi += VmgExitBytes;
+      }
+
+      Ghcb->SaveArea.SwScratch = (UINT64) Ghcb->SharedBuffer;
+      Status = VmgExit (Ghcb, SvmExitIoioProt, ExitInfo1, ExitInfo2);
+      if (Status) {
+        return Status;
+      }
+
+      if (ExitInfo1 & IOIO_TYPE_IN) {
+        CopyMem ((VOID *) Regs->Rdi, Ghcb->SharedBuffer, VmgExitBytes);
+        Regs->Rdi += VmgExitBytes;
+      }
+
+      if (ExitInfo1 & IOIO_REP) {
+        Regs->Rcx -= ExitInfo2;
+      }
+
+      OpCount -= ExitInfo2;
+    }
+  } else {
+    Status = VmgExit (Ghcb, SvmExitIoioProt, ExitInfo1, 0);
+    if (Status) {
+      return Status;
+    }
+
+    if (ExitInfo1 & IOIO_TYPE_IN) {
+      if (!GhcbIsRegValid (Ghcb, GhcbRax)) {
+        return UnsupportedExit (Ghcb, Regs, InstructionData);
+      }
+      Regs->Rax = Ghcb->SaveArea.Rax;
     }
-    Regs->Rax = Ghcb->SaveArea.Rax;
   }
 
   return 0;
-- 
2.17.1


  parent reply	other threads:[~2020-02-04 23:02 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-04 23:01 [PATCH v4 00/40] SEV-ES guest support Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 01/40] MdePkg: Create PCDs to be used in support of SEV-ES Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 02/40] MdePkg: Add the MSR definition for the GHCB register Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 03/40] MdePkg: Add a structure definition for the GHCB Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 04/40] MdeModulePkg/DxeIplPeim: Support GHCB pages when creating page tables Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 05/40] MdePkg/BaseLib: Add support for the XGETBV instruction Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 06/40] MdePkg/BaseLib: Add support for the VMGEXIT instruction Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 07/40] UefiCpuPkg: Implement library support for VMGEXIT Lendacky, Thomas
2020-02-14  0:42   ` [edk2-devel] " Dong, Eric
2020-02-14 17:56     ` Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 08/40] UefiCpuPkg/CpuExceptionHandler: Add base support for the #VC exception Lendacky, Thomas
2020-02-06  8:03   ` [edk2-devel] " Laszlo Ersek
2020-02-07 15:07     ` Lendacky, Thomas
2020-02-10 14:09       ` Laszlo Ersek
2020-02-10 18:13         ` Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 09/40] UefiCpuPkg/CpuExceptionHandler: Add support for IOIO_PROT NAE events Lendacky, Thomas
2020-02-04 23:01 ` Lendacky, Thomas [this message]
2020-02-04 23:01 ` [PATCH v4 11/40] UefiCpuPkg/CpuExceptionHandler: Add support for CPUID " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 12/40] UefiCpuPkg/CpuExceptionHandler: Add support for MSR_PROT " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 13/40] UefiCpuPkg/CpuExceptionHandler: Add support for NPF NAE events (MMIO) Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 14/40] UefiCpuPkg/CpuExceptionHandler: Add support for WBINVD NAE events Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 15/40] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSC " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 16/40] UefiCpuPkg/CpuExceptionHandler: Add support for RDPMC " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 17/40] UefiCpuPkg/CpuExceptionHandler: Add support for INVD " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 18/40] UefiCpuPkg/CpuExceptionHandler: Add support for VMMCALL " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 19/40] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSCP " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 20/40] UefiCpuPkg/CpuExceptionHandler: Add support for MONITOR/MONITORX " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 21/40] UefiCpuPkg/CpuExceptionHandler: Add support for MWAIT/MWAITX " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 22/40] UefiCpuPkg/CpuExceptionHandler: Add support for DR7 Read/Write " Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 23/40] OvmfPkg/MemEncryptSevLib: Add an SEV-ES guest indicator function Lendacky, Thomas
2020-02-06  8:21   ` [edk2-devel] " Laszlo Ersek
2020-02-07 15:29     ` Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 24/40] OvmfPkg: Add support to perform SEV-ES initialization Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 25/40] OvmfPkg: Create a GHCB page for use during Sec phase Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 26/40] OvmfPkg/PlatformPei: Reserve GHCB-related areas if S3 is supported Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 27/40] OvmfPkg: Create GHCB pages for use during Pei and Dxe phase Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 28/40] OvmfPkg/PlatformPei: Move early GDT into ram when SEV-ES is enabled Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 29/40] UefiCpuPkg: Create an SEV-ES workarea PCD Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 30/40] OvmfPkg: Reserve a page in memory for the SEV-ES usage Lendacky, Thomas
2020-02-06  8:43   ` [edk2-devel] " Laszlo Ersek
2020-02-04 23:01 ` [PATCH v4 31/40] OvmfPkg/ResetVector: Add support for a 32-bit SEV check Lendacky, Thomas
2020-02-06  8:51   ` [edk2-devel] " Laszlo Ersek
2020-02-04 23:01 ` [PATCH v4 32/40] OvmfPkg/Sec: Add #VC exception handling for Sec phase Lendacky, Thomas
2020-02-06  9:03   ` [edk2-devel] " Laszlo Ersek
2020-02-04 23:01 ` [PATCH v4 33/40] OvmfPkg/Sec: Enable cache early to speed up booting Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 34/40] OvmfPkg/QemuFlashFvbServicesRuntimeDxe: Bypass flash detection with SEV-ES is enabled Lendacky, Thomas
2020-02-06  9:16   ` [edk2-devel] " Laszlo Ersek
2020-02-04 23:01 ` [PATCH v4 35/40] UefiCpuPkg: Add a 16-bit protected mode code segment descriptor Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 36/40] UefiCpuPkg/MpInitLib: Add a CPU MP data flag to indicate if SEV-ES is enabled Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 37/40] UefiCpuPkg: Allow AP booting under SEV-ES Lendacky, Thomas
2020-02-06  9:35   ` [edk2-devel] " Laszlo Ersek
2020-02-07 15:51     ` Lendacky, Thomas
2020-02-04 23:01 ` [PATCH v4 38/40] OvmfPkg: Use the SEV-ES work area for the SEV-ES AP reset vector Lendacky, Thomas
2020-02-06  9:29   ` [edk2-devel] " Laszlo Ersek
2020-02-04 23:01 ` [PATCH v4 39/40] OvmfPkg: Move the GHCB allocations into reserved memory Lendacky, Thomas
2020-02-05 13:56 ` [PATCH v4 40/40] UefiCpuPkg/MpInitLib: Prepare SEV-ES guest APs for OS use Lendacky, Thomas

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