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| author |   Marc Zyngier <marc.zyngier@arm.com> | 2019-02-07 16:01:21 +0000 |
|---|---|---|
| committer |   Will Deacon <will@kernel.org> | 2019-10-08 12:25:03 +0100 |
| commit | d3ec3a08fa700c8b46abb137dce4e2514a6f9668 (patch) | |
| tree | b2a7d312cb9bbafbfe0564a59fdc1ef0d1b2a411 /arch/arm64/include/asm | |
| parent | Linux 5.4-rc2 (diff) | |
| download | linux-dev-d3ec3a08fa700c8b46abb137dce4e2514a6f9668.tar.xz linux-dev-d3ec3a08fa700c8b46abb137dce4e2514a6f9668.zip | |
arm64: KVM: Trap VM ops when ARM64_WORKAROUND_CAVIUM_TX2_219_TVM is set
In order to workaround the TX2-219 erratum, it is necessary to trap
TTBRx_EL1 accesses to EL2. This is done by setting HCR_EL2.TVM on
guest entry, which has the side effect of trapping all the other
VM-related sysregs as well.
To minimize the overhead, a fast path is used so that we don't
have to go all the way back to the main sysreg handling code,
unless the rest of the hypervisor expects to see these accesses.
Cc: <stable@vger.kernel.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/include/asm')
| -rw-r--r-- | arch/arm64/include/asm/cpucaps.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cpucaps.h index f19fe4b9acc4..e81e0cbd728f 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -52,7 +52,8 @@ #define ARM64_HAS_IRQ_PRIO_MASKING 42 #define ARM64_HAS_DCPODP 43 #define ARM64_WORKAROUND_1463225 44 +#define ARM64_WORKAROUND_CAVIUM_TX2_219_TVM 45 -#define ARM64_NCAPS 45 +#define ARM64_NCAPS 46 #endif /* __ASM_CPUCAPS_H */ |