Giacomo Travaglini has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/64072?usp=email )
Change subject: arch-arm: Add ArmRelease factory function to be used in KVM
mode
......................................................................
arch-arm: Add ArmRelease factory function to be used in KVM mode
From gem5 v22.0, EL2 and EL3 are automatically implemented
in the default release object [1]. This means any FS simulation
will start at EL3, which is the highest implemented EL.
Unfortunately this doesn't work in KVM mode, which is assuming
a VM does not start at EL3:
As soon as updateKvmState is called [2] gem5 tries to set
the VM PSTATE to EL3 and KVM fails the ioctl PSTATE write
[1]: https://gem5-review.googlesource.com/c/public/gem5/+/51011
[2]: https://github.com/gem5/gem5/blob/v22.0.0.2/\
src/arch/arm/kvm/armv8_cpu.cc#L237
Signed-off-by: Giacomo Travaglini <giacomo.travagl...@arm.com>
Change-Id: Icf951bcfb47e0c2ff9abe64b1b9006934303ad48
---
M src/arch/arm/ArmSystem.py
1 file changed, 35 insertions(+), 0 deletions(-)
diff --git a/src/arch/arm/ArmSystem.py b/src/arch/arm/ArmSystem.py
index 3994aee..ce26dab 100644
--- a/src/arch/arm/ArmSystem.py
+++ b/src/arch/arm/ArmSystem.py
@@ -41,6 +41,7 @@
from m5.objects.System import System
from m5.objects.ArmSemihosting import ArmSemihosting
+from typing import Any
class SveVectorLength(UInt8):
min = 1
@@ -108,6 +109,16 @@
else:
return True
+ @classmethod
+ def for_kvm(cls) -> Any:
+ """
+ Generates an ArmRelease for KVM. It simply extracts EL2/EL3 support
+ from the current cls object
+ """
+ release = cls()
+ release.remove(ArmExtension("SECURITY"))
+ release.remove(ArmExtension("VIRTUALIZATION"))
+ return release
class Armv8(ArmRelease):
extensions = ["LPAE", "VIRTUALIZATION", "SECURITY"]
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: Icf951bcfb47e0c2ff9abe64b1b9006934303ad48
Gerrit-Change-Number: 64072
Gerrit-PatchSet: 1
Gerrit-Owner: Giacomo Travaglini <giacomo.travagl...@arm.com>
Gerrit-MessageType: newchange
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