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When QemuFlashWrite() is asked to write a range that includes the last
byte of the LBA, then the byte that the function uses to switch the flash
device back to read mode (ROMD mode in KVM speak) actually falls out of
the LBA.
Normally this doesn't cause visible problems. However, if the variable
store and the firmware code are backed by separate flash devices, as
implemented by
[Qemu-devel] [PATCH v2] hw/i386/pc_sysfw: support two flash drives
http://thread.gmane.org/gmane.comp.emulators.qemu/243678
plus
[edk2] [edk2 PATCH] OvmfPkg: split the variable store to a separate file
http://thread.gmane.org/gmane.comp.bios.tianocore.devel/5045/focus=5046
then the READ_ARRAY_CMD not only reaches a different LBA, it reaches a
different qemu device. This results in a guest reboot soon after.
Fix this by ensuring that we always stay within the LBA just written when
issuing READ_ARRAY_CMD.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14996 6f19259b-4bc3-4df7-8a09-765794883524
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PcdFlashNvStorageVariableBase64 is used to arbitrate between
QemuFlashFvbServicesRuntimeDxe and EmuVariableFvbRuntimeDxe, but even the
latter driver sets it if we fall back to it.
Allow code running later than the startup of these drivers to know about
the availability of flash variables, through a dedicated PCD.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14843 6f19259b-4bc3-4df7-8a09-765794883524
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If QEMU flash is detected, this module will install
FirmwareVolumeBlock support for the QEMU flash device.
It will also set PCDs with the results that:
1. OvmfPkg/EmuVariableFvbRuntimeDxe will be disabled
2. MdeModulePkg variable services will read/write flash directly
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14839 6f19259b-4bc3-4df7-8a09-765794883524
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