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hv: Reserve space for VMs' EPT 4k pages after boot

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As ACRN prepares to support servers with large amounts of memory
current logic to allocate space for 4K pages of EPT at compile time
will increase the size of .bss section of ACRN binary.

Bootloaders could run into a situation where they cannot
find enough contiguous space to load ACRN binary under 4GB,
which is typically heavily fragmented with E820 types Reserved,
ACPI data, 32-bit PCI hole etc.

This patch does the following
1) Works only for "direct" mode of vboot
2) reserves space for 4K pages of EPT, after boot by parsing
platform E820 table, for all types of VMs.

Size comparison:

w/o patch
Size of DRAM            Size of .bss
48 GB                   0xe1bbc98 (~226 MB)
128 GB                  0x222abc98 (~548 MB)

w/ patch
Size of DRAM            Size of .bss
48 GB                   0x1991c98 (~26 MB)
128 GB                  0x1a81c98 (~28 MB)

Tracked-On: #4563
Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Sainath Grandhi
2020-03-30 12:59:25 -07:00
committed by wenlingz
parent 24cfdacb99
commit 8ffe6fc67a
9 changed files with 119 additions and 54 deletions
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3
hypervisor/Makefile
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@@ -337,6 +337,9 @@ SYS_INIT_C_OBJS := $(patsubst %.c,$(HV_OBJDIR)/%.o,$(SYS_INIT_C_SRCS))
ifneq ($(CONFIG_RELEASE),y)
CFLAGS += -DHV_DEBUG -DPROFILING_ON -fno-omit-frame-pointer
endif
ifneq ($(FIRMWARE),uefi)
CFLAGS += -DCONFIG_LAST_LEVEL_EPT_AT_BOOT
endif
PRE_BUILD_SRCS += pre_build/static_checks.c
PRE_BUILD_OBJS := $(patsubst %.c,$(HV_OBJDIR)/%.o,$(PRE_BUILD_SRCS))