[PATCH v4 11/37] KVM: x86: hyper-v: Create a separate fifo for L2 TLB flush

Vitaly Kuznetsov
2022-05-25T09:02:32Z

To handle L2 TLB flush requests, KVM needs to use a separate fifo from
regular (L1) Hyper-V TLB flush requests: e.g. when a request to flush
something in L2 is made, the target vCPU can transition from L2 to L1,
receive a request to flush a GVA for L1 and then try to enter L2 back.
The first request needs to be processed at this point. Similarly,
requests to flush GVAs in L1 must wait until L2 exits to L1.

No functional change as KVM doesn't handle L2 TLB flush requests from
L2 yet.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 8 +++++++-
arch/x86/kvm/hyperv.c | 11 +++++++----
arch/x86/kvm/hyperv.h | 17 ++++++++++++++---
3 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 31e87c5cbf1e..e497bebe229f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -610,6 +610,12 @@ struct kvm_vcpu_hv_synic {
*/
#define KVM_HV_TLB_FLUSHALL_ENTRY ((u64)-1)

+enum hv_tlb_flush_fifos {
+ HV_L1_TLB_FLUSH_FIFO,
+ HV_L2_TLB_FLUSH_FIFO,
+ HV_NR_TLB_FLUSH_FIFOS,
+};
+
struct kvm_vcpu_hv_tlb_flush_fifo {
spinlock_t write_lock;
DECLARE_KFIFO(entries, u64, KVM_HV_TLB_FLUSH_FIFO_SIZE);
@@ -635,7 +641,7 @@ struct kvm_vcpu_hv {
u32 syndbg_cap_eax; /* HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX */
} cpuid_cache;

- struct kvm_vcpu_hv_tlb_flush_fifo tlb_flush_fifo;
+ struct kvm_vcpu_hv_tlb_flush_fifo tlb_flush_fifo[HV_NR_TLB_FLUSH_FIFOS];
};

/* Xen HVM per vcpu emulation context */
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index dbefb492aa35..32bd77c65543 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -956,8 +956,10 @@ static int kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)

hv_vcpu->vp_index = vcpu->vcpu_idx;

- INIT_KFIFO(hv_vcpu->tlb_flush_fifo.entries);
- spin_lock_init(&hv_vcpu->tlb_flush_fifo.write_lock);
+ for (i = 0; i < HV_NR_TLB_FLUSH_FIFOS; i++) {
+ INIT_KFIFO(hv_vcpu->tlb_flush_fifo[i].entries);
+ spin_lock_init(&hv_vcpu->tlb_flush_fifo[i].write_lock);
+ }

return 0;
}
@@ -1843,7 +1845,8 @@ static void hv_tlb_flush_enqueue(struct kvm_vcpu *vcpu, u64 *entries, int count)
if (!hv_vcpu)
return;

- tlb_flush_fifo = &hv_vcpu->tlb_flush_fifo;
+ /* kvm_hv_flush_tlb() is not ready to handle requests for L2s yet */
+ tlb_flush_fifo = &hv_vcpu->tlb_flush_fifo[HV_L1_TLB_FLUSH_FIFO];

spin_lock_irqsave(&tlb_flush_fifo->write_lock, flags);

@@ -1880,7 +1883,7 @@ void kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu)
return;
}

- tlb_flush_fifo = &hv_vcpu->tlb_flush_fifo;
+ tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu);

count = kfifo_out(&tlb_flush_fifo->entries, entries, KVM_HV_TLB_FLUSH_FIFO_SIZE);

diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
index 87d0a0152ad7..aaced3768954 100644
--- a/arch/x86/kvm/hyperv.h
+++ b/arch/x86/kvm/hyperv.h
@@ -22,6 +22,7 @@
#define __ARCH_X86_KVM_HYPERV_H__

#include <linux/kvm_host.h>
+#include "x86.h"

/*
* The #defines related to the synthetic debugger are required by KDNet, but
@@ -147,16 +148,26 @@ int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args);
int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
struct kvm_cpuid_entry2 __user *entries);

+static inline struct kvm_vcpu_hv_tlb_flush_fifo *kvm_hv_get_tlb_flush_fifo(struct kvm_vcpu *vcpu)
+{
+ struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
+ int i = !is_guest_mode(vcpu) ? HV_L1_TLB_FLUSH_FIFO :
+ HV_L2_TLB_FLUSH_FIFO;
+
+ /* KVM does not handle L2 TLB flush requests yet */
+ WARN_ON_ONCE(i != HV_L1_TLB_FLUSH_FIFO);
+
+ return &hv_vcpu->tlb_flush_fifo[i];
+}

static inline void kvm_hv_vcpu_empty_flush_tlb(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo;
- struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);

- if (!hv_vcpu)
+ if (!to_hv_vcpu(vcpu))
return;

- tlb_flush_fifo = &hv_vcpu->tlb_flush_fifo;
+ tlb_flush_fifo = kvm_hv_get_tlb_flush_fifo(vcpu);

kfifo_reset_out(&tlb_flush_fifo->entries);
}
--
2.35.3