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| author | Peter Maydell | 2016-02-19 15:07:43 +0100 |
|---|---|---|
| committer | Peter Maydell | 2016-02-26 16:09:42 +0100 |
| commit | e20d84c1407d43d5a2e2ac95dbb46db3b0af8f9f (patch) | |
| tree | 820337c9a61aecda51fd87f6c98eee41247aa235 /linux-headers/linux/virtio_config.h | |
| parent | target-arm: Mark CNTHP_TVAL_EL2 as ARM_CP_NO_RAW (diff) | |
| download | qemu-e20d84c1407d43d5a2e2ac95dbb46db3b0af8f9f.tar.gz qemu-e20d84c1407d43d5a2e2ac95dbb46db3b0af8f9f.tar.xz qemu-e20d84c1407d43d5a2e2ac95dbb46db3b0af8f9f.zip | |
target-arm: Make reserved ranges in ID_AA64* spaces RAZ, not UNDEF
The v8 ARM ARM defines that unused spaces in the ID_AA64* system
register ranges are Reserved and must RAZ, rather than being UNDEF.
Implement this.
In particular, ARM v8.2 adds a new feature register ID_AA64MMFR2,
and newer versions of the Linux kernel will attempt to read this,
which causes them not to boot up on versions of QEMU missing this fix.
Since the encoding .opc0 = 3, .opc1 = 0, .crn = 0, .crm = 2, .opc2 = 6
is actually defined in ARMv8 (as ID_MMFR4), we give it an entry in
the ARMCPU struct so CPUs can override it, though since none do
this too will just RAZ.
Cc: qemu-stable@nongnu.org
Reported-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1455890863-11203-1-git-send-email-peter.maydell@linaro.org
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Diffstat (limited to 'linux-headers/linux/virtio_config.h')
0 files changed, 0 insertions, 0 deletions