diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2022-11-01 15:53:55 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-11-18 12:59:10 -0500 |
| commit | 53ca765a041d5a24650d3f01bced791be5d72df7 (patch) | |
| tree | 32275d47843885562cf06fd7f99e46b2622d5b1a /arch/x86/include/asm/kvm_host.h | |
| parent | b6c2c22fa7012616b3039c9f559bf01195137b9d (diff) | |
| download | linux-53ca765a041d5a24650d3f01bced791be5d72df7.tar.bz2 | |
KVM: x86: hyper-v: Create a separate fifo for L2 TLB flush
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.
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-18-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/kvm_host.h')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 3e35dcf40dc7..89f9c98ff445 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -631,6 +631,12 @@ 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); @@ -658,7 +664,7 @@ struct kvm_vcpu_hv { u32 nested_ebx; /* HYPERV_CPUID_NESTED_FEATURES.EBX */ } 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 */ |