KVM: arm64: Introduce handling of AArch32 TTBCR2 traps

ARMv8.2 introduced TTBCR2, which shares TCR_EL1 with TTBCR.
Gracefully handle traps to this register when HCR_EL2.TVM is set.

Cc: stable@vger.kernel.org
Reported-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 7a1faf9..803cb24 100644 (file)
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -212,6 +212,7 @@ enum vcpu_sysreg {
 #define c2_TTBR1       (TTBR1_EL1 * 2) /* Translation Table Base Register 1 */
 #define c2_TTBR1_high  (c2_TTBR1 + 1)  /* TTBR1 top 32 bits */
 #define c2_TTBCR       (TCR_EL1 * 2)   /* Translation Table Base Control R. */
+#define c2_TTBCR2      (c2_TTBCR + 1)  /* Translation Table Base Control R. 2 */
 #define c3_DACR                (DACR32_EL2 * 2)/* Domain Access Control Register */
 #define c5_DFSR                (ESR_EL1 * 2)   /* Data Fault Status Register */
 #define c5_IFSR                (IFSR32_EL2 * 2)/* Instruction Fault Status Register */

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 26c7c25..afdf18d 100644 (file)
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1925,6 +1925,7 @@ static const struct sys_reg_desc cp15_regs[] = {
        { Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, c2_TTBR0 },
        { Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, c2_TTBR1 },
        { Op1( 0), CRn( 2), CRm( 0), Op2( 2), access_vm_reg, NULL, c2_TTBCR },
+       { Op1( 0), CRn( 2), CRm( 0), Op2( 3), access_vm_reg, NULL, c2_TTBCR2 },
        { Op1( 0), CRn( 3), CRm( 0), Op2( 0), access_vm_reg, NULL, c3_DACR },
        { Op1( 0), CRn( 5), CRm( 0), Op2( 0), access_vm_reg, NULL, c5_DFSR },
        { Op1( 0), CRn( 5), CRm( 0), Op2( 1), access_vm_reg, NULL, c5_IFSR },