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KVM: PPC: Book3S HV: Fix H_REGISTER_VPA VPA size validation

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KVM currently validates the size of the VPA registered by the client
against sizeof(struct lppaca), however we align (and therefore size)
that struct to 1kB to avoid crossing a 4kB boundary in the client.

PAPR calls for sizes >= 640 bytes to be accepted. Hard code this with
a comment.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Nicholas Piggin 2017-08-13 11:33:38 +10:00 committed by Paul Mackerras
parent d182b8fd60
commit eaac112eac
1 changed files with 7 additions and 1 deletions
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8
arch/powerpc/kvm/book3s_hv.c
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@ -485,7 +485,13 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
switch (subfunc) {
case H_VPA_REG_VPA: /* register VPA */
if (len < sizeof(struct lppaca))
/*
* The size of our lppaca is 1kB because of the way we align
* it for the guest to avoid crossing a 4kB boundary. We only
* use 640 bytes of the structure though, so we should accept
* clients that set a size of 640.
*/
if (len < 640)
break;
vpap = &tvcpu->arch.vpa;
err = 0;