diff options
| author | Marc Zyngier <maz@kernel.org> | 2019-12-01 12:20:17 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2019-12-16 10:46:35 +0000 |
| commit | 5bb0a20b74ad17dee5dae38e3b8b70b383ee7c2d (patch) | |
| tree | 60d79a11f29636313eb7988539cecf1e627267c8 /target/arm/translate.h | |
| parent | 9ca1d776cb49c09b09579d9edd0447542970c834 (diff) | |
target/arm: Handle AArch32 CP15 trapping via HSTR_EL2
HSTR_EL2 offers a way to trap ranges of CP15 system register
accesses to EL2, and it looks like this register is completely
ignored by QEMU.
To avoid adding extra .accessfn filters all over the place (which
would have a direct performance impact), let's add a new TB flag
that gets set whenever HSTR_EL2 is non-zero and that QEMU translates
a context where this trap has a chance to apply, and only generate
the extra access check if the hypervisor is actively using this feature.
Tested with a hand-crafted KVM guest accessing CBAR.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20191201122018.25808-5-maz@kernel.org
[PMM: use is_a64(); fix comment syntax]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'target/arm/translate.h')
| -rw-r--r-- | target/arm/translate.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/target/arm/translate.h b/target/arm/translate.h index dd24f91f26..b837b7fcbf 100644 --- a/target/arm/translate.h +++ b/target/arm/translate.h @@ -77,6 +77,8 @@ typedef struct DisasContext { bool pauth_active; /* True with v8.5-BTI and SCTLR_ELx.BT* set. */ bool bt; + /* True if any CP15 access is trapped by HSTR_EL2 */ + bool hstr_active; /* * >= 0, a copy of PSTATE.BTYPE, which will be 0 without v8.5-BTI. * < 0, set by the current instruction. |