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WSL2-Linux-Kernel
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KVM: PPC: Book3S HV Nested: Fix nested HFSCR being clobbered with multiple vCPUs 

The L0 is storing HFSCR requested by the L1 for the L2 in struct
kvm_nested_guest when the L1 requests a vCPU enter L2. kvm_nested_guest
is not a per-vCPU structure. Hilarity ensues.

Fix it by moving the nested hfscr into the vCPU structure together with
the other per-vCPU nested fields.

Fixes: 8b210a880b ("KVM: PPC: Book3S HV Nested: Make nested HFSCR state accessible")
Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220122105530.3477250-1-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2022-01-22 20:55:30 +10:00 коммит произвёл Michael Ellerman
Родитель fb6433b48a
Коммит 22f7ff0dea
4 изменённых файлов: 3 добавлений и 4 удалений
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1
arch/powerpc/include/asm/kvm_book3s_64.h
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@ -39,7 +39,6 @@ struct kvm_nested_guest {
pgd_t *shadow_pgtable; /* our page table for this guest */ pgd_t *shadow_pgtable; /* our page table for this guest */
u64 l1_gr_to_hr; /* L1's addr of part'n-scoped table */ u64 l1_gr_to_hr; /* L1's addr of part'n-scoped table */
u64 process_table; /* process table entry for this guest */ u64 process_table; /* process table entry for this guest */
u64 hfscr; /* HFSCR that the L1 requested for this nested guest */
long refcnt; /* number of pointers to this struct */ long refcnt; /* number of pointers to this struct */
struct mutex tlb_lock; /* serialize page faults and tlbies */ struct mutex tlb_lock; /* serialize page faults and tlbies */
struct kvm_nested_guest *next; struct kvm_nested_guest *next;

1
arch/powerpc/include/asm/kvm_host.h
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@ -818,6 +818,7 @@ struct kvm_vcpu_arch {
/* For support of nested guests */ /* For support of nested guests */
struct kvm_nested_guest *nested; struct kvm_nested_guest *nested;
u64 nested_hfscr; /* HFSCR that the L1 requested for the nested guest */
u32 nested_vcpu_id; u32 nested_vcpu_id;
gpa_t nested_io_gpr; gpa_t nested_io_gpr;
#endif #endif

3
arch/powerpc/kvm/book3s_hv.c
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@ -1816,7 +1816,6 @@ static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu,
static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu) static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu)
{ {
struct kvm_nested_guest *nested = vcpu->arch.nested;
int r; int r;
int srcu_idx; int srcu_idx;
@ -1922,7 +1921,7 @@ static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu)
* it into a HEAI. * it into a HEAI.
*/ */
if (!(vcpu->arch.hfscr_permitted & (1UL << cause)) || if (!(vcpu->arch.hfscr_permitted & (1UL << cause)) ||
(nested->hfscr & (1UL << cause))) { (vcpu->arch.nested_hfscr & (1UL << cause))) {
vcpu->arch.trap = BOOK3S_INTERRUPT_H_EMUL_ASSIST; vcpu->arch.trap = BOOK3S_INTERRUPT_H_EMUL_ASSIST;
/* /*

2
arch/powerpc/kvm/book3s_hv_nested.c
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@ -363,7 +363,7 @@ long kvmhv_enter_nested_guest(struct kvm_vcpu *vcpu)
/* set L1 state to L2 state */ /* set L1 state to L2 state */
vcpu->arch.nested = l2; vcpu->arch.nested = l2;
vcpu->arch.nested_vcpu_id = l2_hv.vcpu_token; vcpu->arch.nested_vcpu_id = l2_hv.vcpu_token;
l2->hfscr = l2_hv.hfscr; vcpu->arch.nested_hfscr = l2_hv.hfscr;
vcpu->arch.regs = l2_regs; vcpu->arch.regs = l2_regs;
/* Guest must always run with ME enabled, HV disabled. */ /* Guest must always run with ME enabled, HV disabled. */