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x86/irq: Let interrupt handlers set kvm_cpu_l1tf_flush_l1d

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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>
This commit is contained in:
Nicolai Stange 2018-07-29 13:06:04 +02:00 committed by Thomas Gleixner
parent 447ae31667
commit ffcba43ff6
3 changed files with 5 additions and 0 deletions
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3
arch/x86/include/asm/apic.h
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@ -10,6 +10,7 @@
#include <asm/fixmap.h>
#include <asm/mpspec.h>
#include <asm/msr.h>
#include <asm/hardirq.h>
#define ARCH_APICTIMER_STOPS_ON_C3 1
@ -514,6 +515,7 @@ extern void irq_exit(void);
static inline void entering_irq(void)
{
irq_enter();
kvm_set_cpu_l1tf_flush_l1d();
}
static inline void entering_ack_irq(void)
@ -526,6 +528,7 @@ static inline void ipi_entering_ack_irq(void)
{
irq_enter();
ack_APIC_irq();
kvm_set_cpu_l1tf_flush_l1d();
}
static inline void exiting_irq(void)

1
arch/x86/kernel/smp.c
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@ -261,6 +261,7 @@ __visible void __irq_entry smp_reschedule_interrupt(struct pt_regs *regs)
{
ack_APIC_irq();
inc_irq_stat(irq_resched_count);
kvm_set_cpu_l1tf_flush_l1d();
if (trace_resched_ipi_enabled()) {
/*

1
arch/x86/platform/uv/tlb_uv.c
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@ -1285,6 +1285,7 @@ void uv_bau_message_interrupt(struct pt_regs *regs)
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());