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[PATCH v7 0/3] hw/riscv/virt: pflash improvements
From: |
Sunil V L |
Subject: |
[PATCH v7 0/3] hw/riscv/virt: pflash improvements |
Date: |
Thu, 1 Jun 2023 10:29:07 +0530 |
This series improves the pflash usage in RISC-V virt machine with solutions to
below issues.
1) Currently the first pflash is reserved for ROM/M-mode firmware code. But
S-mode
payload firmware like EDK2 need both pflash devices to have separate code and
variable
store so that OS distros can keep the FW code as read-only.
The issue is reported at
https://salsa.debian.org/qemu-team/edk2/-/commit/c345655a0149f64c5020bfc1e53c619ce60587f6
2) The latest way of using pflash devices in other architectures and libvirt
is by using -blockdev and machine options. However, currently this method is
not working in RISC-V.
With above issues fixed, added documentation on how to use pflash devices
in RISC-V virt machine.
This patch series is based on Alistair's riscv-to-apply.next branch.
Changes since v6:
1) Updated the documentation patch as per text provided by Andrea.
Changes since v5:
1) Added KVM use case as per feedback from Anup. Updated the
documentation
patch that only S-mode payload is supported for KVM guests. Tested
with
KVM enabled.
2) Updated tags.
Changes since v4:
1) Updated patch 2 to avoid accessing private field as per feedback
from Philippe.
2) Updated documentation patch to add read-only for ROM usage.
3) Rebased to latest riscv-to-apply.next branch and updated tags.
Changes since v3:
1) Converted single patch to a series with a cover letter since there
are
multiple patches now.
2) Added a new patch to enable pflash usage via -blockdev option.
3) Separated the documentation change into new patch and updated the
documentation to mention only -blockdev option which seems to be the
recommended way of using pflash.
Changes since v2:
1) Reverted v2 changes and used v1 approach so that pflash0 can be used
for code and pflash1 for variable store.
2) Rebased to latest riscv-to-apply.next branch.
3) Added documentation for pflash usage.
Changes since v1:
1) Simplified the fix such that it doesn't break current EDK2.
Sunil V L (3):
hw/riscv: virt: Assume M-mode FW in pflash0 only when "-bios none"
riscv/virt: Support using pflash via -blockdev option
docs/system: riscv: Add pflash usage details
docs/system/riscv/virt.rst | 31 ++++++++++++++++++++
hw/riscv/virt.c | 59 ++++++++++++++++----------------------
2 files changed, 56 insertions(+), 34 deletions(-)
--
2.34.1
- [PATCH v7 0/3] hw/riscv/virt: pflash improvements,
Sunil V L <=