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target/ppc: Fix regression due to Power10 and Power11 having same PCR 

Power11 has the same PCR (Processor Compatibility Register) value, as
Power10.

Due to this, QEMU considers Power11 as a valid compat-mode for Power10,
ie. earlier it was possible to run QEMU with
'-M pseries,max-compat-mode=power11 --cpu power10'

Same PCR also introduced a regression where `-M pseries --cpu power10`
boots as Power11 (ie. logical PVR is of Power11, even though PVR is
Power10).  The regression was due to 'do_client_architecture_support'
checking for valid compat modes and finding Power11 to be a valid compat
mode for Power10 (it happens even without passing 'max-compat-mode'
explicitly).

Fix compat-mode issue and regression, by ensuring a future Power
processor (with a higher logical_pvr value, eg. P11) cannot be valid
compat-mode for an older Power processor (eg. P10)

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Aditya Gupta <adityag@linux.ibm.com>
Tested-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Aditya Gupta 2024-07-31 11:20:20 +05:30 committed by Nicholas Piggin
parent c0b2f0dd6b
commit ac0fbbb2d0
1 changed files with 4 additions and 0 deletions
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4
target/ppc/compat.c
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@ -132,6 +132,10 @@ static bool pcc_compat(PowerPCCPUClass *pcc, uint32_t compat_pvr,
/* Outside specified range */
return false;
}
if (compat->pvr > pcc->spapr_logical_pvr) {
/* Older CPU cannot support a newer processor's compat mode */
return false;
}
if (!(pcc->pcr_supported & compat->pcr_level)) {
/* Not supported by this CPU */
return false;