From: "Lendacky, Thomas via groups.io" <thomas.lendacky=amd.com@groups.io>
To: <devel@edk2.groups.io>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>,
Erdem Aktas <erdemaktas@google.com>,
Gerd Hoffmann <kraxel@redhat.com>,
Jiewen Yao <jiewen.yao@intel.com>,
Laszlo Ersek <lersek@redhat.com>,
Liming Gao <gaoliming@byosoft.com.cn>,
Michael D Kinney <michael.d.kinney@intel.com>,
Min Xu <min.m.xu@intel.com>,
Zhiguang Liu <zhiguang.liu@intel.com>,
"Rahul Kumar" <rahul1.kumar@intel.com>, Ray Ni <ray.ni@intel.com>,
Michael Roth <michael.roth@amd.com>
Subject: [edk2-devel] [PATCH v2 15/23] UefiCpuPkg/MpInitLib: Use CcSvsmSnpVmsaRmpAdjust() to set/clear VMSA
Date: Thu, 22 Feb 2024 11:29:54 -0600 [thread overview]
Message-ID: <382475a0ea64319e93aa4fe4b8e8a9e0d11d2ed1.1708623001.git.thomas.lendacky@amd.com> (raw)
In-Reply-To: <cover.1708623001.git.thomas.lendacky@amd.com>
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654
The RMPADJUST instruction is used to change the VMSA attribute of a page,
but the VMSA attribute can only be changed when running at VMPL0. To
prepare for running at a less priviledged VMPL, use the CcSvsmLib library
API to perform the RMPADJUST. The CcSvsmLib library will perform the
proper operation on behalf of the caller.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf | 1 +
UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf | 1 +
UefiCpuPkg/Library/MpInitLib/MpLib.h | 14 -----
UefiCpuPkg/Library/MpInitLib/Ia32/AmdSev.c | 20 --------
UefiCpuPkg/Library/MpInitLib/X64/AmdSev.c | 54 +++-----------------
5 files changed, 9 insertions(+), 81 deletions(-)
diff --git a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
index 538a2146ff24..1b6abc4440cb 100644
--- a/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
+++ b/UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
@@ -57,6 +57,7 @@ [LibraryClasses]
SynchronizationLib
PcdLib
CcExitLib
+ CcSvsmLib
MicrocodeLib
[LibraryClasses.X64]
CpuPageTableLib
diff --git a/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf b/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
index 622baec45e2f..9077114b1e6d 100644
--- a/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
+++ b/UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
@@ -53,6 +53,7 @@ [LibraryClasses]
PeiServicesLib
PcdLib
CcExitLib
+ CcSvsmLib
MicrocodeLib
[Pcd]
diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.h b/UefiCpuPkg/Library/MpInitLib/MpLib.h
index 617f7401aea8..53a25c4634a1 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.h
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.h
@@ -870,20 +870,6 @@ FillExchangeInfoDataSevEs (
IN volatile MP_CPU_EXCHANGE_INFO *ExchangeInfo
);
-/**
- Issue RMPADJUST to adjust the VMSA attribute of an SEV-SNP page.
-
- @param[in] PageAddress
- @param[in] VmsaPage
-
- @return RMPADJUST return value
-**/
-UINT32
-SevSnpRmpAdjust (
- IN EFI_PHYSICAL_ADDRESS PageAddress,
- IN BOOLEAN VmsaPage
- );
-
/**
Create an SEV-SNP AP save area (VMSA) for use in running the vCPU.
diff --git a/UefiCpuPkg/Library/MpInitLib/Ia32/AmdSev.c b/UefiCpuPkg/Library/MpInitLib/Ia32/AmdSev.c
index 0478e92317f1..963bd62494b9 100644
--- a/UefiCpuPkg/Library/MpInitLib/Ia32/AmdSev.c
+++ b/UefiCpuPkg/Library/MpInitLib/Ia32/AmdSev.c
@@ -49,26 +49,6 @@ SevSnpCreateAP (
ASSERT (FALSE);
}
-/**
- Issue RMPADJUST to adjust the VMSA attribute of an SEV-SNP page.
-
- @param[in] PageAddress
- @param[in] VmsaPage
-
- @return RMPADJUST return value
-**/
-UINT32
-SevSnpRmpAdjust (
- IN EFI_PHYSICAL_ADDRESS PageAddress,
- IN BOOLEAN VmsaPage
- )
-{
- //
- // RMPADJUST is not supported in 32-bit mode
- //
- return RETURN_UNSUPPORTED;
-}
-
/**
Determine if the SEV-SNP AP Create protocol should be used.
diff --git a/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.c b/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.c
index 5d92c441adcd..bb4a52b25cd2 100644
--- a/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.c
+++ b/UefiCpuPkg/Library/MpInitLib/X64/AmdSev.c
@@ -10,6 +10,7 @@
#include "MpLib.h"
#include <Library/CcExitLib.h>
+#include <Library/CcSvsmLib.h>
#include <Register/Amd/Fam17Msr.h>
#include <Register/Amd/Ghcb.h>
@@ -38,20 +39,15 @@ SevSnpPerformApAction (
BOOLEAN InterruptState;
UINT64 ExitInfo1;
UINT64 ExitInfo2;
- UINT32 RmpAdjustStatus;
UINT64 VmgExitStatus;
+ EFI_STATUS VmsaStatus;
if (Action == SVM_VMGEXIT_SNP_AP_CREATE) {
//
- // To turn the page into a recognized VMSA page, issue RMPADJUST:
- // Target VMPL but numerically higher than current VMPL
- // Target PermissionMask is not used
+ // Turn the page into a recognized VMSA page.
//
- RmpAdjustStatus = SevSnpRmpAdjust (
- (EFI_PHYSICAL_ADDRESS)(UINTN)SaveArea,
- TRUE
- );
- if (RmpAdjustStatus != 0) {
+ VmsaStatus = CcSvsmSnpVmsaRmpAdjust (SaveArea, ApicId, TRUE);
+ if (EFI_ERROR (VmsaStatus)) {
DEBUG ((DEBUG_INFO, "SEV-SNP: RMPADJUST failed for VMSA creation\n"));
ASSERT (FALSE);
@@ -94,11 +90,8 @@ SevSnpPerformApAction (
// Make the current VMSA not runnable and accessible to be
// reprogrammed.
//
- RmpAdjustStatus = SevSnpRmpAdjust (
- (EFI_PHYSICAL_ADDRESS)(UINTN)SaveArea,
- FALSE
- );
- if (RmpAdjustStatus != 0) {
+ VmsaStatus = CcSvsmSnpVmsaRmpAdjust (SaveArea, ApicId, FALSE);
+ if (EFI_ERROR (VmsaStatus)) {
DEBUG ((DEBUG_INFO, "SEV-SNP: RMPADJUST failed for VMSA reset\n"));
ASSERT (FALSE);
@@ -328,39 +321,6 @@ SevSnpCreateAP (
}
}
-/**
- Issue RMPADJUST to adjust the VMSA attribute of an SEV-SNP page.
-
- @param[in] PageAddress
- @param[in] VmsaPage
-
- @return RMPADJUST return value
-**/
-UINT32
-SevSnpRmpAdjust (
- IN EFI_PHYSICAL_ADDRESS PageAddress,
- IN BOOLEAN VmsaPage
- )
-{
- UINT64 Rdx;
-
- //
- // The RMPADJUST instruction is used to set or clear the VMSA bit for a
- // page. The VMSA change is only made when running at VMPL0 and is ignored
- // otherwise. If too low a target VMPL is specified, the instruction can
- // succeed without changing the VMSA bit when not running at VMPL0. Using a
- // target VMPL level of 1, RMPADJUST will return a FAIL_PERMISSION error if
- // not running at VMPL0, thus ensuring that the VMSA bit is set appropriately
- // when no error is returned.
- //
- Rdx = 1;
- if (VmsaPage) {
- Rdx |= RMPADJUST_VMSA_PAGE_BIT;
- }
-
- return AsmRmpAdjust ((UINT64)PageAddress, 0, Rdx);
-}
-
/**
Determine if the SEV-SNP AP Create protocol should be used.
--
2.42.0
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next prev parent reply other threads:[~2024-02-22 17:32 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-22 17:29 [edk2-devel] [PATCH v2 00/23] Provide SEV-SNP support for running under an SVSM Lendacky, Thomas via groups.io
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 01/23] OvmfPkg/BaseMemEncryptLib: Fix error check from AsmRmpAdjust() Lendacky, Thomas via groups.io
2024-02-27 9:46 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 02/23] MdePkg: GHCB APIC ID retrieval support definitions Lendacky, Thomas via groups.io
2024-02-23 0:16 ` Ni, Ray
2024-02-27 10:02 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 03/23] OvmfPkg/PlatformPei: Retrieve APIC IDs from the hypervisor Lendacky, Thomas via groups.io
2024-02-27 10:03 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 04/23] UefiCpuPkg/MpInitLib: Always use AP Create if PcdSevSnpApicIds is set Lendacky, Thomas via groups.io
2024-02-27 10:11 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 05/23] OvmfPkg/BaseMemEncryptSevLib: Fix uncrustify errors Lendacky, Thomas via groups.io
2024-02-27 10:12 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 06/23] OvmfPkg/BaseMemEncryptSevLib: Calculate memory size for Page State Change Lendacky, Thomas via groups.io
2024-02-27 10:17 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 07/23] MdePkg: Avoid hardcoded value for number of Page State Change entries Lendacky, Thomas via groups.io
2024-02-27 10:18 ` Gerd Hoffmann
2024-02-27 15:52 ` Lendacky, Thomas via groups.io
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 08/23] OvmfPkg/BaseMemEncryptSevLib: Re-organize page state change support Lendacky, Thomas via groups.io
2024-02-27 11:07 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 09/23] OvmfPkg/BaseMemEncryptSevLib: Maximize Page State Change efficiency Lendacky, Thomas via groups.io
2024-02-27 11:19 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 10/23] MdePkg/Register/Amd: Define the SVSM related information Lendacky, Thomas via groups.io
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 11/23] MdePkg/BaseLib: Add a new VMGEXIT instruction invocation for SVSM Lendacky, Thomas via groups.io
2024-02-27 11:50 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 12/23] UefiCpuPkg/CcSvsmLib: Create the CcSvsmLib library to support an SVSM Lendacky, Thomas via groups.io
2024-02-27 11:53 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 13/23] UefiPayloadPkg: Prepare UefiPayloadPkg to use the CcSvsmLib library Lendacky, Thomas via groups.io
2024-02-27 11:54 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 14/23] Ovmfpkg/CcSvsmLib: Create CcSvsmLib to handle SVSM related services Lendacky, Thomas via groups.io
2024-02-28 8:40 ` Gerd Hoffmann
2024-02-28 15:51 ` Lendacky, Thomas via groups.io
2024-03-01 10:59 ` Gerd Hoffmann
2024-02-22 17:29 ` Lendacky, Thomas via groups.io [this message]
2024-02-28 8:42 ` [edk2-devel] [PATCH v2 15/23] UefiCpuPkg/MpInitLib: Use CcSvsmSnpVmsaRmpAdjust() to set/clear VMSA Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 16/23] OvmfPkg/BaseMemEncryptSevLib: Use CcSvsmSnpPvalidate() to validate pages Lendacky, Thomas via groups.io
2024-02-28 8:43 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 17/23] OvmfPkg: Create a calling area used to communicate with the SVSM Lendacky, Thomas via groups.io
2024-02-28 8:44 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 18/23] OvmfPkg/CcSvsmLib: Add support for the SVSM_CORE_PVALIDATE call Lendacky, Thomas via groups.io
2024-02-28 8:50 ` Gerd Hoffmann
2024-02-28 15:58 ` Lendacky, Thomas via groups.io
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 19/23] OvmfPkg/BaseMemEncryptSevLib: Maximize Page State Change efficiency Lendacky, Thomas via groups.io
2024-02-28 8:50 ` Gerd Hoffmann
2024-02-22 17:29 ` [edk2-devel] [PATCH v2 20/23] OvmfPkg/CcSvsmLib: Add support for the SVSM create/delete vCPU calls Lendacky, Thomas via groups.io
2024-02-28 8:52 ` Gerd Hoffmann
2024-02-22 17:30 ` [edk2-devel] [PATCH v2 21/23] UefiCpuPkg/MpInitLib: AP creation support under an SVSM Lendacky, Thomas via groups.io
2024-02-22 17:30 ` [edk2-devel] [PATCH v2 22/23] Ovmfpkg/CcExitLib: Provide SVSM discovery support Lendacky, Thomas via groups.io
2024-02-28 8:54 ` Gerd Hoffmann
2024-02-22 17:30 ` [edk2-devel] [PATCH v2 23/23] OvmfPkg/BaseMemEncryptLib: Check for presence of an SVSM when not at VMPL0 Lendacky, Thomas via groups.io
2024-02-28 6:14 ` [edk2-devel] [PATCH v2 00/23] Provide SEV-SNP support for running under an SVSM Yao, Jiewen
2024-02-28 16:19 ` Lendacky, Thomas via groups.io
2024-02-29 14:06 ` Yao, Jiewen
2024-02-29 14:36 ` Lendacky, Thomas via groups.io
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