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target-arm: Fix reset and migration of TTBCR(S)

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Commit 6459b94c26dd666badb3 broke reset and migration of the AArch32
TTBCR(S) register if the guest used non-LPAE page tables. This is
because the AArch32 TTBCR register definition is marked as ARM_CP_ALIAS,
meaning that the AArch64 variant has to handle migration and reset.
Although AArch64 TCR_EL3 doesn't need to care about the mask and
base_mask fields, AArch32 may do so, and so we must use the special
TTBCR reset and raw write functions to ensure they are set correctly.

This doesn't affect TCR_EL2, because the AArch32 equivalent of that
is HTCR, which never uses the non-LPAE page table variant.

Backports commit 811595a2d4ab8c6354857a50ffd29fafce52a892 from qemu
This commit is contained in:
Peter Maydell 2018-02-24 18:18:14 -05:00 committed by Lioncash
parent 51c9e12605
commit a9fb399490
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 4 additions and 2 deletions
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6
qemu/target-arm/helper.c
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@ -3278,9 +3278,11 @@ static const ARMCPRegInfo el3_cp_reginfo[] = {
{ "TCR_EL3", 0,2,0, 3,6,2, ARM_CP_STATE_AA64,0,
PL3_RW, 0, NULL, 0, offsetof(CPUARMState, cp15.tcr_el[3]), {0, 0},
/* no .writefn needed as this can't cause an ASID change;
* no .raw_writefn or .resetfn needed as we never use mask/base_mask
* we must provide a .raw_writefn and .resetfn because we handle
* reset and migration for the AArch32 TTBCR(S), which might be
* using mask and base_mask.
*/
NULL, NULL, NULL, NULL, NULL, NULL },
NULL, NULL, NULL, NULL, vmsa_ttbcr_raw_write, vmsa_ttbcr_reset },
{ "ELR_EL3", 0,4,0, 3,6,1, ARM_CP_STATE_AA64,
ARM_CP_ALIAS, PL3_RW, 0, NULL, 0, offsetof(CPUARMState, elr_el[3]) },
{ "ESR_EL3", 0,5,2, 3,6,0, ARM_CP_STATE_AA64, 0,