[PATCH 51/60] kvm: x86: Share pio_data across planes
Jörg Rödel <[email protected]>
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From: Joerg Roedel <[email protected]> The vcpu->arch.pio_data pointer is memory mapped to user-space alongside the kvm_run page. So it also needs to be common across all planes for a given VCPU index. Signed-off-by: Joerg Roedel <[email protected]> --- arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/kvm/x86.c | 20 +++++++++++--------- virt/kvm/kvm_main.c | 2 +- 3 files changed, 14 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 0327b77e56b7..1b7aa48c961e 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -801,6 +801,8 @@ struct kvm_vcpu_arch_common { bool cpuid_dynamic_bits_dirty; bool is_amd_compatible; + void *pio_data; + /* * cpu_caps holds the effective guest capabilities, i.e. the features * the vCPU is allowed to use. Typically, but not always, features can diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 5f48392d4738..08fe65b8d57d 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8532,7 +8532,7 @@ static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size, } static int emulator_pio_in(struct kvm_vcpu *vcpu, int size, - unsigned short port, void *val, unsigned int count) + unsigned short port, void *val, unsigned int count) { int r = emulator_pio_in_out(vcpu, size, port, val, count, true); if (r) @@ -12936,7 +12936,6 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) { - struct page *page; int r; vcpu->arch.last_vmentry_cpu = -1; @@ -12960,10 +12959,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) r = -ENOMEM; - page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); - if (!page) - goto fail_free_lapic; - vcpu->arch.pio_data = page_address(page); + vcpu->arch.pio_data = vcpu->common->arch.pio_data; vcpu->arch.mce_banks = kcalloc(KVM_MAX_MCE_BANKS * 4, sizeof(u64), GFP_KERNEL_ACCOUNT); @@ -13023,8 +13019,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) fail_free_mce_banks: kfree(vcpu->arch.mce_banks); kfree(vcpu->arch.mci_ctl2_banks); - free_page((unsigned long)vcpu->arch.pio_data); -fail_free_lapic: kvm_free_lapic(vcpu); fail_mmu_destroy: kvm_mmu_destroy(vcpu); @@ -13072,16 +13066,24 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) idx = srcu_read_lock(&vcpu->kvm->srcu); kvm_mmu_destroy(vcpu); srcu_read_unlock(&vcpu->kvm->srcu, idx); - free_page((unsigned long)vcpu->arch.pio_data); } int kvm_arch_vcpu_common_init(struct kvm_vcpu_common *common) { + struct page *page; + + page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); + if (!page) + return -ENOMEM; + + common->arch.pio_data = page_address(page); + return 0; } void kvm_arch_vcpu_common_destroy(struct kvm_vcpu_common *common) { + free_page((unsigned long)common->arch.pio_data); kvfree(common->arch.cpuid_entries); } diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index a6d7601c3412..8f1a16af519a 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4250,7 +4250,7 @@ static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf) page = virt_to_page(vcpu->run); #ifdef CONFIG_X86 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) - page = virt_to_page(vcpu->arch.pio_data); + page = virt_to_page(vcpu->common->arch.pio_data); #endif #ifdef CONFIG_KVM_MMIO else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) -- 2.53.0 -- kvm-riscv mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kvm-riscv