[PATCH v2 10/26] KVM: arm64: Correctly handle ACCDATA_EL1 traps
From: Marc Zyngier <maz@kernel.org>
Date: 2023-07-28 08:48:00
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
As we blindly reset some HFGxTR_EL2 bits to 0, we also randomly trap unsuspecting sysregs that have their trap bits with a negative polarity. ACCDATA_EL1 is one such register that can be accessed by the guest, causing a splat on the host as we don't have a proper handler for it. Adding such handler addresses the issue, though there are a number of other registers missing as the current architecture documentation doesn't describe them yet. Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/include/asm/sysreg.h | 2 ++ arch/arm64/kvm/sys_regs.c | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 6d3d16fac227..d528a79417a0 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h@@ -389,6 +389,8 @@ #define SYS_ICC_IGRPEN0_EL1 sys_reg(3, 0, 12, 12, 6) #define SYS_ICC_IGRPEN1_EL1 sys_reg(3, 0, 12, 12, 7) +#define SYS_ACCDATA_EL1 sys_reg(3, 0, 13, 0, 5) + #define SYS_CNTKCTL_EL1 sys_reg(3, 0, 14, 1, 0) #define SYS_AIDR_EL1 sys_reg(3, 1, 0, 0, 7)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 2ca2973abe66..38f221f9fc98 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c@@ -2151,6 +2151,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { { SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 }, { SYS_DESC(SYS_TPIDR_EL1), NULL, reset_unknown, TPIDR_EL1 }, + { SYS_DESC(SYS_ACCDATA_EL1), undef_access }, + { SYS_DESC(SYS_SCXTNUM_EL1), undef_access }, { SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0},
--
2.34.1
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