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KVM: s390: vsie: Use virt_to_phys for facility control block

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In order for SIE to interpretively execute STFLE, it requires the real
or absolute address of a facility-list control block.
Before writing the location into the shadow SIE control block, convert
it from a virtual address.
We currently do not run into this bug because the lower 31 bits are the
same for virtual and physical addresses.

Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Link: https://lore.kernel.org/r/20240319164420.4053380-3-nsg@linux.ibm.com
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20240319164420.4053380-3-nsg@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Nina Schoetterl-Glausch 2024-03-19 17:44:20 +01:00 committed by Alexander Gordeev
parent 8692a24d0f
commit 22fdd8ba61
1 changed files with 2 additions and 1 deletions
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3
arch/s390/kvm/vsie.c
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@ -12,6 +12,7 @@
#include <linux/list.h>
#include <linux/bitmap.h>
#include <linux/sched/signal.h>
#include <linux/io.h>
#include <asm/gmap.h>
#include <asm/mmu_context.h>
@ -1005,7 +1006,7 @@ static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
if (read_guest_real(vcpu, fac, &vsie_page->fac,
stfle_size() * sizeof(u64)))
return set_validity_icpt(scb_s, 0x1090U);
scb_s->fac = (__u32)(__u64) &vsie_page->fac;
scb_s->fac = (u32)virt_to_phys(&vsie_page->fac);
}
return 0;
}