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Date: Mon, 6 Mar 2017 13:45:03 -0700
From: Tyler Baicar <tbaicar@...eaurora.org>
To: christoffer.dall@...aro.org, marc.zyngier@....com,
pbonzini@...hat.com, rkrcmar@...hat.com, linux@...linux.org.uk,
catalin.marinas@....com, will.deacon@....com, rjw@...ysocki.net,
lenb@...nel.org, matt@...eblueprint.co.uk, robert.moore@...el.com,
lv.zheng@...el.com, nkaje@...eaurora.org, zjzhang@...eaurora.org,
mark.rutland@....com, james.morse@....com,
akpm@...ux-foundation.org, eun.taik.lee@...sung.com,
sandeepa.s.prabhu@...il.com, labbott@...hat.com,
shijie.huang@....com, rruigrok@...eaurora.org,
paul.gortmaker@...driver.com, tn@...ihalf.com, fu.wei@...aro.org,
rostedt@...dmis.org, bristot@...hat.com,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org, linux-efi@...r.kernel.org,
devel@...ica.org, Suzuki.Poulose@....com, punit.agrawal@....com,
astone@...hat.com, harba@...eaurora.org, hanjun.guo@...aro.org,
john.garry@...wei.com, shiju.jose@...wei.com, joe@...ches.com
Cc: Tyler Baicar <tbaicar@...eaurora.org>
Subject: [PATCH V12 10/10] arm/arm64: KVM: add guest SEA support
Currently external aborts are unsupported by the guest abort
handling. Add handling for SEAs so that the host kernel reports
SEAs which occur in the guest kernel.
Signed-off-by: Tyler Baicar <tbaicar@...eaurora.org>
---
arch/arm/include/asm/kvm_arm.h | 10 ++++++++++
arch/arm/include/asm/system_misc.h | 5 +++++
arch/arm/kvm/mmu.c | 36 ++++++++++++++++++++++++++++++++++--
arch/arm64/include/asm/kvm_arm.h | 10 ++++++++++
arch/arm64/include/asm/system_misc.h | 2 ++
arch/arm64/mm/fault.c | 18 ++++++++++++++++++
6 files changed, 79 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
index e22089f..a1a3dff 100644
--- a/arch/arm/include/asm/kvm_arm.h
+++ b/arch/arm/include/asm/kvm_arm.h
@@ -187,6 +187,16 @@
#define FSC_FAULT (0x04)
#define FSC_ACCESS (0x08)
#define FSC_PERM (0x0c)
+#define FSC_SEA (0x10)
+#define FSC_SEA_TTW0 (0x14)
+#define FSC_SEA_TTW1 (0x15)
+#define FSC_SEA_TTW2 (0x16)
+#define FSC_SEA_TTW3 (0x17)
+#define FSC_SECC (0x18)
+#define FSC_SECC_TTW0 (0x1c)
+#define FSC_SECC_TTW1 (0x1d)
+#define FSC_SECC_TTW2 (0x1e)
+#define FSC_SECC_TTW3 (0x1f)
/* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
#define HPFAR_MASK (~0xf)
diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
index a3d61ad..ea45d94 100644
--- a/arch/arm/include/asm/system_misc.h
+++ b/arch/arm/include/asm/system_misc.h
@@ -24,4 +24,9 @@
#endif /* !__ASSEMBLY__ */
+static inline int handle_guest_sea(unsigned long addr, unsigned int esr)
+{
+ return -1;
+}
+
#endif /* __ASM_ARM_SYSTEM_MISC_H */
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index a5265ed..f3608c9 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -29,6 +29,7 @@
#include <asm/kvm_asm.h>
#include <asm/kvm_emulate.h>
#include <asm/virt.h>
+#include <asm/system_misc.h>
#include "trace.h"
@@ -1409,6 +1410,24 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa)
kvm_set_pfn_accessed(pfn);
}
+static bool is_abort_synchronous(unsigned long fault_status) {
+ switch (fault_status) {
+ case FSC_SEA:
+ case FSC_SEA_TTW0:
+ case FSC_SEA_TTW1:
+ case FSC_SEA_TTW2:
+ case FSC_SEA_TTW3:
+ case FSC_SECC:
+ case FSC_SECC_TTW0:
+ case FSC_SECC_TTW1:
+ case FSC_SECC_TTW2:
+ case FSC_SECC_TTW3:
+ return true;
+ default:
+ return false;
+ }
+}
+
/**
* kvm_handle_guest_abort - handles all 2nd stage aborts
* @vcpu: the VCPU pointer
@@ -1444,8 +1463,21 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
/* Check the stage-2 fault is trans. fault or write fault */
fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
- if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
- fault_status != FSC_ACCESS) {
+
+ /* The host kernel will handle the synchronous external abort. There
+ * is no need to pass the error into the guest.
+ */
+ if (is_abort_synchronous(fault_status)) {
+ if(handle_guest_sea((unsigned long)fault_ipa,
+ kvm_vcpu_get_hsr(vcpu))) {
+ kvm_err("Failed to handle guest SEA, FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
+ kvm_vcpu_trap_get_class(vcpu),
+ (unsigned long)kvm_vcpu_trap_get_fault(vcpu),
+ (unsigned long)kvm_vcpu_get_hsr(vcpu));
+ return -EFAULT;
+ }
+ } else if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&
+ fault_status != FSC_ACCESS) {
kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n",
kvm_vcpu_trap_get_class(vcpu),
(unsigned long)kvm_vcpu_trap_get_fault(vcpu),
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 2a2752b..dcacdbb 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -201,6 +201,16 @@
#define FSC_FAULT ESR_ELx_FSC_FAULT
#define FSC_ACCESS ESR_ELx_FSC_ACCESS
#define FSC_PERM ESR_ELx_FSC_PERM
+#define FSC_SEA ESR_ELx_FSC_EXTABT
+#define FSC_SEA_TTW0 (0x14)
+#define FSC_SEA_TTW1 (0x15)
+#define FSC_SEA_TTW2 (0x16)
+#define FSC_SEA_TTW3 (0x17)
+#define FSC_SECC (0x18)
+#define FSC_SECC_TTW0 (0x1c)
+#define FSC_SECC_TTW1 (0x1d)
+#define FSC_SECC_TTW2 (0x1e)
+#define FSC_SECC_TTW3 (0x1f)
/* Hyp Prefetch Fault Address Register (HPFAR/HDFAR) */
#define HPFAR_MASK (~UL(0xf))
diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
index bc81243..5b2cecd1 100644
--- a/arch/arm64/include/asm/system_misc.h
+++ b/arch/arm64/include/asm/system_misc.h
@@ -58,4 +58,6 @@ void hook_debug_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
#endif /* __ASSEMBLY__ */
+int handle_guest_sea(unsigned long addr, unsigned int esr);
+
#endif /* __ASM_SYSTEM_MISC_H */
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index b2d57fc..31c5171 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -602,6 +602,24 @@ static const char *fault_name(unsigned int esr)
}
/*
+ * Handle Synchronous External Aborts that occur in a guest kernel.
+ */
+int handle_guest_sea(unsigned long addr, unsigned int esr)
+{
+ /*
+ * synchronize_rcu() will wait for nmi_exit(), so no need to
+ * rcu_read_lock().
+ */
+ if(IS_ENABLED(ACPI_APEI_SEA)) {
+ rcu_read_lock();
+ ghes_notify_sea();
+ rcu_read_unlock();
+ }
+
+ return 0;
+}
+
+/*
* Dispatch a data abort to the relevant handler.
*/
asmlinkage void __exception do_mem_abort(unsigned long addr, unsigned int esr,
--
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project.
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