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[Qemu-devel] [PATCH v2] kvm: Make vcpu->requests as 64 bit bitmap
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From: |
Andrey Smetanin |
|
Subject: |
[Qemu-devel] [PATCH v2] kvm: Make vcpu->requests as 64 bit bitmap |
|
Date: |
Thu, 24 Dec 2015 16:29:21 +0300 |
Currently on x86 arch we has already 32 requests defined
so the newer request bits can't be placed inside
vcpu->requests(unsigned long) inside x86 32 bit system.
But we are going to add a new request in x86 arch
for Hyper-V tsc page support.
To solve the problem the patch replaces vcpu->requests by
bitmap with 64 bit length and uses bitmap API.
The patch consists of:
* announce kvm_has_requests() to check whether vcpu has
requests
* announce kvm_clear_request() to clear particular vcpu request
* announce kvm_test_request() to test particular vcpu request
* replace if (vcpu->requests) by if (kvm_has_requests(vcpu))
* replace clear_bit(req, vcpu->requests) by
kvm_clear_request(req, vcpu)
Changes v2:
* hide internals of vcpu requests bitmap
by interface usage in all places
* replace test_bit(req, vcpu->requests) by
kvm_test_request()
* POWERPC: trace vcpu requests bitmap by
__bitmask, __assign_bitmap, __get_bitmask
Signed-off-by: Andrey Smetanin <address@hidden>
Acked-by: James Hogan <address@hidden>
CC: Paolo Bonzini <address@hidden>
CC: Gleb Natapov <address@hidden>
CC: James Hogan <address@hidden>
CC: Paul Burton <address@hidden>
CC: Ralf Baechle <address@hidden>
CC: Alexander Graf <address@hidden>
CC: Christian Borntraeger <address@hidden>
CC: Cornelia Huck <address@hidden>
CC: address@hidden
CC: address@hidden
CC: address@hidden
CC: Roman Kagan <address@hidden>
CC: Denis V. Lunev <address@hidden>
CC: address@hidden
---
arch/mips/kvm/emulate.c | 4 +---
arch/powerpc/kvm/book3s_pr.c | 2 +-
arch/powerpc/kvm/book3s_pr_papr.c | 2 +-
arch/powerpc/kvm/booke.c | 6 +++---
arch/powerpc/kvm/powerpc.c | 6 +++---
arch/powerpc/kvm/trace.h | 9 +++++----
arch/s390/kvm/kvm-s390.c | 4 ++--
arch/x86/kvm/vmx.c | 2 +-
arch/x86/kvm/x86.c | 16 ++++++++--------
include/linux/kvm_host.h | 38 +++++++++++++++++++++++++-------------
10 files changed, 50 insertions(+), 39 deletions(-)
diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c
index 41b1b09..14aebe8 100644
--- a/arch/mips/kvm/emulate.c
+++ b/arch/mips/kvm/emulate.c
@@ -774,10 +774,8 @@ enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu
*vcpu)
* We we are runnable, then definitely go off to user space to
* check if any I/O interrupts are pending.
*/
- if (kvm_check_request(KVM_REQ_UNHALT, vcpu)) {
- clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
+ if (kvm_check_request(KVM_REQ_UNHALT, vcpu))
vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
- }
}
return EMULATE_DONE;
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 64891b0..e975279 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -349,7 +349,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64
msr)
if (msr & MSR_POW) {
if (!vcpu->arch.pending_exceptions) {
kvm_vcpu_block(vcpu);
- clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
+ kvm_clear_request(KVM_REQ_UNHALT, vcpu));
vcpu->stat.halt_wakeup++;
/* Unset POW bit after we woke up */
diff --git a/arch/powerpc/kvm/book3s_pr_papr.c
b/arch/powerpc/kvm/book3s_pr_papr.c
index f2c75a1..60cf393 100644
--- a/arch/powerpc/kvm/book3s_pr_papr.c
+++ b/arch/powerpc/kvm/book3s_pr_papr.c
@@ -309,7 +309,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
case H_CEDE:
kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
kvm_vcpu_block(vcpu);
- clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
+ kvm_clear_request(KVM_REQ_UNHALT, vcpu);
vcpu->stat.halt_wakeup++;
return EMULATE_DONE;
case H_LOGICAL_CI_LOAD:
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index fd58751..b2e8643 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -574,7 +574,7 @@ static void arm_next_watchdog(struct kvm_vcpu *vcpu)
* userspace, so clear the KVM_REQ_WATCHDOG request.
*/
if ((vcpu->arch.tsr & (TSR_ENW | TSR_WIS)) != (TSR_ENW | TSR_WIS))
- clear_bit(KVM_REQ_WATCHDOG, &vcpu->requests);
+ kvm_clear_request(KVM_REQ_WATCHDOG, vcpu);
spin_lock_irqsave(&vcpu->arch.wdt_lock, flags);
nr_jiffies = watchdog_next_timeout(vcpu);
@@ -677,7 +677,7 @@ int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
kvmppc_core_check_exceptions(vcpu);
- if (vcpu->requests) {
+ if (kvm_has_requests(vcpu)) {
/* Exception delivery raised request; start over */
return 1;
}
@@ -685,7 +685,7 @@ int kvmppc_core_prepare_to_enter(struct kvm_vcpu *vcpu)
if (vcpu->arch.shared->msr & MSR_WE) {
local_irq_enable();
kvm_vcpu_block(vcpu);
- clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
+ kvm_clear_request(KVM_REQ_UNHALT, vcpu);
hard_irq_disable();
kvmppc_set_exit_type(vcpu, EMULATED_MTMSRWE_EXITS);
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 6fd2405..5cd6c29 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -49,7 +49,7 @@ EXPORT_SYMBOL_GPL(kvmppc_pr_ops);
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
return !!(v->arch.pending_exceptions) ||
- v->requests;
+ kvm_has_requests(v);
}
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
@@ -98,7 +98,7 @@ int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
*/
smp_mb();
- if (vcpu->requests) {
+ if (kvm_has_requests(vcpu)) {
/* Make sure we process requests preemptable */
local_irq_enable();
trace_kvm_check_requests(vcpu);
@@ -225,7 +225,7 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
case EV_HCALL_TOKEN(EV_IDLE):
r = EV_SUCCESS;
kvm_vcpu_block(vcpu);
- clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
+ kvm_clear_request(KVM_REQ_UNHALT, vcpu);
break;
default:
r = EV_UNIMPLEMENTED;
diff --git a/arch/powerpc/kvm/trace.h b/arch/powerpc/kvm/trace.h
index 2e0e67e..5eaea01 100644
--- a/arch/powerpc/kvm/trace.h
+++ b/arch/powerpc/kvm/trace.h
@@ -104,16 +104,17 @@ TRACE_EVENT(kvm_check_requests,
TP_STRUCT__entry(
__field( __u32, cpu_nr )
- __field( __u32, requests )
+ __bitmask(cpu_requests, KVM_REQ_MAX)
),
TP_fast_assign(
__entry->cpu_nr = vcpu->vcpu_id;
- __entry->requests = vcpu->requests;
+ __assign_bitmask(cpu_requests, (void *)vcpu->requests,
+ KVM_REQ_MAX);
),
- TP_printk("vcpu=%x requests=%x",
- __entry->cpu_nr, __entry->requests)
+ TP_printk("vcpu=%x requests=0x%s",
+ __entry->cpu_nr, __get_bitmask(cpu_requests))
);
#endif /* _TRACE_KVM_H */
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 8465892..439c106 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1847,7 +1847,7 @@ static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
{
retry:
kvm_s390_vcpu_request_handled(vcpu);
- if (!vcpu->requests)
+ if (!kvm_has_requests(vcpu))
return 0;
/*
* We use MMU_RELOAD just to re-arm the ipte notifier for the
@@ -1890,7 +1890,7 @@ retry:
}
/* nothing to do, just clear the request */
- clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
+ kvm_clear_request(KVM_REQ_UNHALT, vcpu);
return 0;
}
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 1a8bfaa..8c843e5 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5957,7 +5957,7 @@ static int handle_invalid_guest_state(struct kvm_vcpu
*vcpu)
if (intr_window_requested && vmx_interrupt_allowed(vcpu))
return handle_interrupt_window(&vmx->vcpu);
- if (test_bit(KVM_REQ_EVENT, &vcpu->requests))
+ if (kvm_test_request(KVM_REQ_EVENT, vcpu))
return 1;
err = emulate_instruction(vcpu, EMULTYPE_NO_REEXECUTE);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0601c05..cf4911f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1702,7 +1702,7 @@ static void kvm_gen_update_masterclock(struct kvm *kvm)
/* guest entries allowed */
kvm_for_each_vcpu(i, vcpu, kvm)
- clear_bit(KVM_REQ_MCLOCK_INPROGRESS, &vcpu->requests);
+ kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu);
spin_unlock(&ka->pvclock_gtod_sync_lock);
#endif
@@ -2116,8 +2116,8 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct
msr_data *msr_info)
bool tmp = (msr == MSR_KVM_SYSTEM_TIME);
if (ka->boot_vcpu_runs_old_kvmclock != tmp)
- set_bit(KVM_REQ_MASTERCLOCK_UPDATE,
- &vcpu->requests);
+ kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE,
+ vcpu);
ka->boot_vcpu_runs_old_kvmclock = tmp;
}
@@ -6410,7 +6410,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
bool req_immediate_exit = false;
- if (vcpu->requests) {
+ if (kvm_has_requests(vcpu)) {
if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
kvm_mmu_unload(vcpu);
if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
@@ -6560,7 +6560,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
local_irq_disable();
- if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
+ if (vcpu->mode == EXITING_GUEST_MODE || kvm_has_requests(vcpu)
|| need_resched() || signal_pending(current)) {
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();
@@ -6720,7 +6720,7 @@ static int vcpu_run(struct kvm_vcpu *vcpu)
if (r <= 0)
break;
- clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
+ kvm_clear_request(KVM_REQ_PENDING_TIMER, vcpu);
if (kvm_cpu_has_pending_timer(vcpu))
kvm_inject_pending_timer_irqs(vcpu);
@@ -6848,7 +6848,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct
kvm_run *kvm_run)
if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
kvm_vcpu_block(vcpu);
kvm_apic_accept_events(vcpu);
- clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
+ kvm_clear_request(KVM_REQ_UNHALT, vcpu);
r = -EAGAIN;
goto out;
}
@@ -8048,7 +8048,7 @@ static inline bool kvm_vcpu_has_events(struct kvm_vcpu
*vcpu)
if (atomic_read(&vcpu->arch.nmi_queued))
return true;
- if (test_bit(KVM_REQ_SMI, &vcpu->requests))
+ if (kvm_test_request(KVM_REQ_SMI, vcpu))
return true;
if (kvm_arch_interrupt_allowed(vcpu) &&
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index da7a7e4..d1ef7ad 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -146,6 +146,8 @@ static inline bool is_error_page(struct page *page)
#define KVM_REQ_HV_EXIT 30
#define KVM_REQ_HV_STIMER 31
+#define KVM_REQ_MAX 64
+
#define KVM_USERSPACE_IRQ_SOURCE_ID 0
#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID 1
@@ -233,7 +235,7 @@ struct kvm_vcpu {
int vcpu_id;
int srcu_idx;
int mode;
- unsigned long requests;
+ DECLARE_BITMAP(requests, KVM_REQ_MAX);
unsigned long guest_debug;
int pre_pcpu;
@@ -1000,11 +1002,6 @@ static inline bool kvm_is_error_gpa(struct kvm *kvm,
gpa_t gpa)
return kvm_is_error_hva(hva);
}
-static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
-{
- set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
-}
-
enum kvm_stat_kind {
KVM_STAT_VM,
KVM_STAT_VCPU,
@@ -1116,19 +1113,34 @@ bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
#endif
+static inline bool kvm_has_requests(struct kvm_vcpu *vcpu)
+{
+ return !bitmap_empty(vcpu->requests, KVM_REQ_MAX);
+}
+
static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
{
- set_bit(req, &vcpu->requests);
+ set_bit(req, (ulong *)vcpu->requests);
}
static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
{
- if (test_bit(req, &vcpu->requests)) {
- clear_bit(req, &vcpu->requests);
- return true;
- } else {
- return false;
- }
+ return test_and_clear_bit(req, (ulong *)vcpu->requests);
+}
+
+static inline bool kvm_test_request(int req, struct kvm_vcpu *vcpu)
+{
+ return test_bit(req, (ulong *)vcpu->requests);
+}
+
+static inline void kvm_clear_request(int req, struct kvm_vcpu *vcpu)
+{
+ clear_bit(req, (ulong *)vcpu->requests);
+}
+
+static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
+{
+ kvm_make_request(KVM_REQ_MIGRATE_TIMER, vcpu);
}
extern bool kvm_rebooting;
--
2.4.3
- [Qemu-devel] [PATCH v2] kvm: Make vcpu->requests as 64 bit bitmap,
Andrey Smetanin <=