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Subject[PATCH 4.9 089/107] x86/irq: Let interrupt handlers set kvm_cpu_l1tf_flush_l1d
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicolai Stange <nstange@suse.de>

commit ffcba43ff66c7dab34ec700debd491d2a4d319b4 upstream

The last missing piece to having vmx_l1d_flush() take interrupts after
VMEXIT into account is to set the kvm_cpu_l1tf_flush_l1d per-cpu flag on
irq entry.

Issue calls to kvm_set_cpu_l1tf_flush_l1d() from entering_irq(),
ipi_entering_ack_irq(), smp_reschedule_interrupt() and
uv_bau_message_interrupt().

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Nicolai Stange <nstange@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/include/asm/apic.h | 3 +++
arch/x86/kernel/smp.c | 1 +
arch/x86/platform/uv/tlb_uv.c | 1 +
3 files changed, 5 insertions(+)

--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -12,6 +12,7 @@
#include <asm/mpspec.h>
#include <asm/msr.h>
#include <asm/idle.h>
+#include <asm/hardirq.h>

#define ARCH_APICTIMER_STOPS_ON_C3 1

@@ -647,6 +648,7 @@ static inline void entering_irq(void)
{
irq_enter();
exit_idle();
+ kvm_set_cpu_l1tf_flush_l1d();
}

static inline void entering_ack_irq(void)
@@ -659,6 +661,7 @@ static inline void ipi_entering_ack_irq(
{
irq_enter();
ack_APIC_irq();
+ kvm_set_cpu_l1tf_flush_l1d();
}

static inline void exiting_irq(void)
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -271,6 +271,7 @@ __visible void __irq_entry smp_reschedul
/*
* KVM uses this interrupt to force a cpu out of guest mode
*/
+ kvm_set_cpu_l1tf_flush_l1d();
}

__visible void __irq_entry smp_trace_reschedule_interrupt(struct pt_regs *regs)
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -1283,6 +1283,7 @@ void uv_bau_message_interrupt(struct pt_
struct msg_desc msgdesc;

ack_APIC_irq();
+ kvm_set_cpu_l1tf_flush_l1d();
time_start = get_cycles();

bcp = &per_cpu(bau_control, smp_processor_id());

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