The patch titled
KVM: Expose interrupt bitmap
has been added to the -mm tree. Its filename is
kvm-expose-interrupt-bitmap.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: KVM: Expose interrupt bitmap
From: Uri Lublin <uril@xxxxxxxxxxxx>
Expose all not-yet-delivered interrupts to userspace. This allows a guest to
be saved and resumed even if some interrupts are yet pending.
Signed-off-by: Uri Lublin <uril@xxxxxxxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/kvm/kvm.h | 3 ++-
drivers/kvm/kvm_main.c | 12 +++++++++++-
include/linux/kvm.h | 14 ++++++++++----
3 files changed, 23 insertions(+), 6 deletions(-)
diff -puN drivers/kvm/kvm.h~kvm-expose-interrupt-bitmap drivers/kvm/kvm.h
--- a/drivers/kvm/kvm.h~kvm-expose-interrupt-bitmap
+++ a/drivers/kvm/kvm.h
@@ -8,6 +8,7 @@
#include <linux/mm.h>
#include "vmx.h"
+#include <linux/kvm.h>
#define CR0_PE_MASK (1ULL << 0)
#define CR0_TS_MASK (1ULL << 3)
@@ -159,7 +160,7 @@ struct kvm_vcpu {
int cpu;
int launched;
unsigned long irq_summary; /* bit vector: 1 per word in irq_pending */
-#define NR_IRQ_WORDS (256 / BITS_PER_LONG)
+#define NR_IRQ_WORDS KVM_IRQ_BITMAP_SIZE(unsigned long)
unsigned long irq_pending[NR_IRQ_WORDS];
unsigned long regs[NR_VCPU_REGS]; /* for rsp: vcpu_load_rsp_rip() */
unsigned long rip; /* needs vcpu_load_rsp_rip() */
diff -puN drivers/kvm/kvm_main.c~kvm-expose-interrupt-bitmap drivers/kvm/kvm_main.c
--- a/drivers/kvm/kvm_main.c~kvm-expose-interrupt-bitmap
+++ a/drivers/kvm/kvm_main.c
@@ -2997,7 +2997,8 @@ static int kvm_dev_ioctl_get_sregs(struc
sregs->efer = vcpu->shadow_efer;
sregs->apic_base = vcpu->apic_base;
- sregs->pending_int = vcpu->irq_summary != 0;
+ memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
+ sizeof sregs->interrupt_bitmap);
vcpu_put(vcpu);
@@ -3031,6 +3032,7 @@ static int kvm_dev_ioctl_set_sregs(struc
{
struct kvm_vcpu *vcpu;
int mmu_reset_needed = 0;
+ int i;
if (sregs->vcpu < 0 || sregs->vcpu >= KVM_MAX_VCPUS)
return -EINVAL;
@@ -3080,6 +3082,14 @@ static int kvm_dev_ioctl_set_sregs(struc
if (mmu_reset_needed)
kvm_mmu_reset_context(vcpu);
+
+ memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
+ sizeof vcpu->irq_pending);
+ vcpu->irq_summary = 0;
+ for (i = 0; i < NR_IRQ_WORDS; ++i)
+ if (vcpu->irq_pending[i])
+ __set_bit(i, &vcpu->irq_summary);
+
vcpu_put(vcpu);
return 0;
diff -puN include/linux/kvm.h~kvm-expose-interrupt-bitmap include/linux/kvm.h
--- a/include/linux/kvm.h~kvm-expose-interrupt-bitmap
+++ a/include/linux/kvm.h
@@ -11,6 +11,15 @@
#include <asm/types.h>
#include <linux/ioctl.h>
+/*
+ * Architectural interrupt line count, and the size of the bitmap needed
+ * to hold them.
+ */
+#define KVM_NR_INTERRUPTS 256
+#define KVM_IRQ_BITMAP_SIZE_BYTES ((KVM_NR_INTERRUPTS + 7) / 8)
+#define KVM_IRQ_BITMAP_SIZE(type) (KVM_IRQ_BITMAP_SIZE_BYTES / sizeof(type))
+
+
/* for KVM_CREATE_MEMORY_REGION */
struct kvm_memory_region {
__u32 slot;
@@ -129,10 +138,7 @@ struct kvm_sregs {
__u64 cr0, cr2, cr3, cr4, cr8;
__u64 efer;
__u64 apic_base;
-
- /* out (KVM_GET_SREGS) */
- __u32 pending_int;
- __u32 padding2;
+ __u64 interrupt_bitmap[KVM_IRQ_BITMAP_SIZE(__u64)];
};
/* for KVM_TRANSLATE */
_
Patches currently in -mm which might be from uril@xxxxxxxxxxxx are
kvm-expose-interrupt-bitmap.patch
kvm-add-time-stamp-counter-msr-and-accessors.patch
kvm-expose-msrs-to-userspace.patch
-
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