From: Marc Zyngier <maz@kernel.org>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
Will Deacon <will@kernel.org>,
Peng Liang <liangpeng10@huawei.com>,
James Morse <james.morse@arm.com>,
kernel-team@android.com,
Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: [PATCH 3/3] KVM: arm64: Handle SCXTNUM_ELx traps
Date: Tue, 3 Nov 2020 17:14:45 +0000 [thread overview]
Message-ID: <20201103171445.271195-4-maz@kernel.org> (raw)
In-Reply-To: <20201103171445.271195-1-maz@kernel.org>
As the kernel never sets HCR_EL2.EnSCXT, accesses to SCXTNUM_ELx
will trap to EL2. Let's handle that as gracefully as possible
by injecting an UNDEF exception into the guest. This is consistent
with the guest's view of ID_AA64PFR0_EL1.CSV2 being at most 1.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/include/asm/sysreg.h | 4 ++++
arch/arm64/kvm/sys_regs.c | 4 ++++
2 files changed, 8 insertions(+)
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 174817ba119c..e2ef4c2edf06 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -372,6 +372,8 @@
#define SYS_CONTEXTIDR_EL1 sys_reg(3, 0, 13, 0, 1)
#define SYS_TPIDR_EL1 sys_reg(3, 0, 13, 0, 4)
+#define SYS_SCXTNUM_EL1 sys_reg(3, 0, 13, 0, 7)
+
#define SYS_CNTKCTL_EL1 sys_reg(3, 0, 14, 1, 0)
#define SYS_CCSIDR_EL1 sys_reg(3, 1, 0, 0, 0)
@@ -404,6 +406,8 @@
#define SYS_TPIDR_EL0 sys_reg(3, 3, 13, 0, 2)
#define SYS_TPIDRRO_EL0 sys_reg(3, 3, 13, 0, 3)
+#define SYS_SCXTNUM_EL0 sys_reg(3, 3, 13, 0, 7)
+
/* Definitions for system register interface to AMU for ARMv8.4 onwards */
#define SYS_AM_EL0(crm, op2) sys_reg(3, 3, 13, (crm), (op2))
#define SYS_AMCR_EL0 SYS_AM_EL0(2, 0)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index fafaa81bf1f6..d66930edb60c 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1651,6 +1651,8 @@ 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_SCXTNUM_EL1), undef_access },
+
{ SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0},
{ SYS_DESC(SYS_CCSIDR_EL1), access_ccsidr },
@@ -1679,6 +1681,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 },
{ SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 },
+ { SYS_DESC(SYS_SCXTNUM_EL0), undef_access },
+
{ SYS_DESC(SYS_AMCR_EL0), undef_access },
{ SYS_DESC(SYS_AMCFGR_EL0), undef_access },
{ SYS_DESC(SYS_AMCGCR_EL0), undef_access },
--
2.28.0
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next prev parent reply other threads:[~2020-11-03 17:15 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-03 17:14 [PATCH 0/3] KVM: arm64: Another set of CSV2-related fixes Marc Zyngier
2020-11-03 17:14 ` [PATCH 1/3] KVM: arm64: Allow setting of ID_AA64PFR0_EL1.CSV2 from userspace Marc Zyngier
2020-11-05 22:44 ` Will Deacon
2020-11-06 9:57 ` Marc Zyngier
2020-11-03 17:14 ` [PATCH 2/3] KVM: arm64: Rename access_amu() to undef_access() Marc Zyngier
2020-11-05 22:50 ` Will Deacon
2020-11-06 10:54 ` Marc Zyngier
2020-11-03 17:14 ` Marc Zyngier [this message]
2020-11-05 22:50 ` [PATCH 3/3] KVM: arm64: Handle SCXTNUM_ELx traps Will Deacon
-- strict thread matches above, loose matches on Subject: below --
2020-11-12 22:21 [PATCH 0/3] KVM/arm64 fixes for 5.10, take #3 Marc Zyngier
2020-11-12 22:21 ` [PATCH 3/3] KVM: arm64: Handle SCXTNUM_ELx traps Marc Zyngier
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