Commit ec12bb57 authored Mar 02, 2018 by Paul Mackerras Committed by Greg Kroah-Hartman May 30, 2018

KVM: PPC: Book3S HV: Fix VRMA initialization with 2MB or 1GB memory backing



[ Upstream commit debd574f4195e205ba505b25e19b2b797f4bcd94 ]

The current code for initializing the VRMA (virtual real memory area)
for HPT guests requires the page size of the backing memory to be one
of 4kB, 64kB or 16MB.  With a radix host we have the possibility that
the backing memory page size can be 2MB or 1GB.  In these cases, if the
guest switches to HPT mode, KVM will not initialize the VRMA and the
guest will fail to run.

In fact it is not necessary that the VRMA page size is the same as the
backing memory page size; any VRMA page size less than or equal to the
backing memory page size is acceptable.  Therefore we now choose the
largest page size out of the set {4k, 64k, 16M} which is not larger
than the backing memory page size.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent be00ce58

arch/powerpc/kvm/book3s_hv.c

+7 −5

Original line number	Original line	Diff line number	Diff line
	@@ -3107,15 +3107,17 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
	goto up_out;		goto up_out;

	psize = vma_kernel_pagesize(vma);		psize = vma_kernel_pagesize(vma);
	porder = __ilog2(psize);

	up_read(&current->mm->mmap_sem);		up_read(&current->mm->mmap_sem);

	/* We can handle 4k, 64k or 16M pages in the VRMA */		/* We can handle 4k, 64k or 16M pages in the VRMA */
	err = -EINVAL;		if (psize >= 0x1000000)
	if (!(psize == 0x1000 \|\| psize == 0x10000 \|\|		psize = 0x1000000;
	psize == 0x1000000))		else if (psize >= 0x10000)
	goto out_srcu;		psize = 0x10000;
			else
			psize = 0x1000;
			porder = __ilog2(psize);

	/* Update VRMASD field in the LPCR */		/* Update VRMASD field in the LPCR */
	senc = slb_pgsize_encoding(psize);		senc = slb_pgsize_encoding(psize);