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authorReiji Watanabe <reijiw@google.com>2022-09-16 18:05:58 -0700
committerMarc Zyngier <maz@kernel.org>2022-09-19 10:48:53 +0100
commit370531d1e95be57c62fdf065fb04fd8db7ade8f9 (patch)
tree8e8cd69ad11b601d9e1ea52678ff6c523ac3df12
parent34fbdee086cfcc20fe889d2b83afddfbe2ac3096 (diff)
KVM: arm64: Clear PSTATE.SS when the Software Step state was Active-pending
While userspace enables single-step, if the Software Step state at the last guest exit was "Active-pending", clear PSTATE.SS on guest entry to restore the state. Currently, KVM sets PSTATE.SS to 1 on every guest entry while userspace enables single-step for the vCPU (with KVM_GUESTDBG_SINGLESTEP). It means KVM always makes the vCPU's Software Step state "Active-not-pending" on the guest entry, which lets the VCPU perform single-step (then Software Step exception is taken). This could cause extra single-step (without returning to userspace) if the Software Step state at the last guest exit was "Active-pending" (i.e. the last exit was triggered by an asynchronous exception after the single-step is performed, but before the Software Step exception is taken. See "Figure D2-3 Software step state machine" and "D2.12.7 Behavior in the active-pending state" in ARM DDI 0487I.a for more info about this behavior). Fix this by clearing PSTATE.SS on guest entry if the Software Step state at the last exit was "Active-pending" so that KVM restore the state (and the exception is taken before further single-step is performed). Fixes: 337b99bf7edf ("KVM: arm64: guest debug, add support for single-step") Signed-off-by: Reiji Watanabe <reijiw@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220917010600.532642-3-reijiw@google.com
-rw-r--r--arch/arm64/include/asm/kvm_host.h3
-rw-r--r--arch/arm64/kvm/debug.c22
-rw-r--r--arch/arm64/kvm/guest.c1
-rw-r--r--arch/arm64/kvm/handle_exit.c8
4 files changed, 32 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index ccf8a144f009..45e2136322ba 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -536,6 +536,9 @@ struct kvm_vcpu_arch {
#define IN_WFIT __vcpu_single_flag(sflags, BIT(3))
/* vcpu system registers loaded on physical CPU */
#define SYSREGS_ON_CPU __vcpu_single_flag(sflags, BIT(4))
+/* Software step state is Active-pending */
+#define DBG_SS_ACTIVE_PENDING __vcpu_single_flag(sflags, BIT(5))
+
/* Pointer to the vcpu's SVE FFR for sve_{save,load}_state() */
#define vcpu_sve_pffr(vcpu) (kern_hyp_va((vcpu)->arch.sve_state) + \
diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c
index 1bd2a1aee11c..56361e512b8a 100644
--- a/arch/arm64/kvm/debug.c
+++ b/arch/arm64/kvm/debug.c
@@ -200,7 +200,18 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu)
* debugging the system.
*/
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
- *vcpu_cpsr(vcpu) |= DBG_SPSR_SS;
+ /*
+ * If the software step state at the last guest exit
+ * was Active-pending, we don't set DBG_SPSR_SS so
+ * that the state is maintained (to not run another
+ * single-step until the pending Software Step
+ * exception is taken).
+ */
+ if (!vcpu_get_flag(vcpu, DBG_SS_ACTIVE_PENDING))
+ *vcpu_cpsr(vcpu) |= DBG_SPSR_SS;
+ else
+ *vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS;
+
mdscr = vcpu_read_sys_reg(vcpu, MDSCR_EL1);
mdscr |= DBG_MDSCR_SS;
vcpu_write_sys_reg(vcpu, mdscr, MDSCR_EL1);
@@ -274,6 +285,15 @@ void kvm_arm_clear_debug(struct kvm_vcpu *vcpu)
* Restore the guest's debug registers if we were using them.
*/
if (vcpu->guest_debug || kvm_vcpu_os_lock_enabled(vcpu)) {
+ if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
+ if (!(*vcpu_cpsr(vcpu) & DBG_SPSR_SS))
+ /*
+ * Mark the vcpu as ACTIVE_PENDING
+ * until Software Step exception is taken.
+ */
+ vcpu_set_flag(vcpu, DBG_SS_ACTIVE_PENDING);
+ }
+
restore_guest_debug_regs(vcpu);
/*
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index f802a3b3f8db..2ff13a3f8479 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -937,6 +937,7 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
} else {
/* If not enabled clear all flags */
vcpu->guest_debug = 0;
+ vcpu_clear_flag(vcpu, DBG_SS_ACTIVE_PENDING);
}
out:
diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
index bbe5b393d689..e778eefcf214 100644
--- a/arch/arm64/kvm/handle_exit.c
+++ b/arch/arm64/kvm/handle_exit.c
@@ -152,8 +152,14 @@ static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu)
run->debug.arch.hsr_high = upper_32_bits(esr);
run->flags = KVM_DEBUG_ARCH_HSR_HIGH_VALID;
- if (ESR_ELx_EC(esr) == ESR_ELx_EC_WATCHPT_LOW)
+ switch (ESR_ELx_EC(esr)) {
+ case ESR_ELx_EC_WATCHPT_LOW:
run->debug.arch.far = vcpu->arch.fault.far_el2;
+ break;
+ case ESR_ELx_EC_SOFTSTP_LOW:
+ vcpu_clear_flag(vcpu, DBG_SS_ACTIVE_PENDING);
+ break;
+ }
return 0;
}