Brijesh Singh b721aa749b OvmfPkg/BaseMemEncryptSevLib: Enable protection for newly added page table ... Commit 2ac1730bf2 (MdeModulePkg/DxeIpl: Mark page table as read-only) sets the memory pages used for page table as read-only after paging is setup and sets CR0.WP to protect CPU modifying the read-only pages. The commit causes #PF when MemEncryptSevClearPageEncMask() or MemEncryptSevSetPageEncMask() tries to change the page-table attributes. This patch takes the similar approach as Commit 147fd35c3e (UefiCpuPkg/CpuDxe: Enable protection for newly added page table). When page table protection is enabled, we disable it temporarily before changing the page table attributes. This patch makes use of the same approach as Commit 2ac1730bf2 (MdeModulePkg/DxeIpl: Mark page table as read-only)) for allocating page table memory from reserved memory pool, which helps to reduce a potential "split" operation. The patch duplicates code from commit 147fd35c3e. The code duplication will be removed after we implement page table manipulation library. See bugzilla https://bugzilla.tianocore.org/show_bug.cgi?id=847. Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Acked-by: Laszlo Ersek <lersek@redhat.com>		2018-01-15 21:18:50 +01:00
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AcpiTimerLib	…
BaseMemEncryptSevLib	OvmfPkg/BaseMemEncryptSevLib: Enable protection for newly added page table	2018-01-15 21:18:50 +01:00
DxePciLibI440FxQ35	…
EmuVariableFvbLib	…
LoadLinuxLib	…
LockBoxLib	…
NvVarsFileLib	…
PciHostBridgeLib	…
PlatformBootManagerLib	OvmfPkg/PlatformBootManagerLib: log informative message at DEBUG_INFO lvl	2017-09-11 22:39:32 +02:00
PlatformDebugLibIoPort	OvmfPkg: save on I/O port accesses when the debug port is not in use	2017-11-17 18:35:12 +01:00
PlatformFvbLibNull	…
PlatformHasIoMmuLib	…
PlatformSecureLib	…
QemuBootOrderLib	OvmfPkg/QemuBootOrderLib: let an OFW devpath match multiple UEFI boot opts	2017-11-28 21:37:11 +01:00
QemuFwCfgLib	OvmfPkg/QemuFwCfgDxeLib: SEV: zero FW_CFG_DMA_ACCESS before decrypting it	2017-08-29 22:44:33 +02:00
QemuFwCfgS3Lib	…
ResetSystemLib	…
SerializeVariablesLib	…
SmbiosVersionLib	…
SmmCpuFeaturesLib	…
VirtioLib	OvmfPkg/VirtioLib: change the parameter of VirtioAppendDesc() to UINT64	2017-08-25 10:42:19 +02:00
VirtioMmioDeviceLib	OvmfPkg/Virtio: take RingBaseShift in SetQueueAddress()	2017-08-25 10:42:19 +02:00
XenConsoleSerialPortLib	…
XenHypercallLib	OvmfPkg/XenHypercallLib: enable virt extensions for ARM	2017-11-17 09:56:50 +00:00
XenIoMmioLib	…