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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Thursday 29 Jul 2021 at 14:50:16 (+0100), Marc Zyngier wrote: > Booting a KVM host in protected mode with kmemleak quickly results > in a pretty bad crash, as kmemleak doesn't know that the HYP sections > have been taken away. > > Make the unregistration from kmemleak part of marking the sections > as HYP-private. The rest of the HYP-specific data is obtained via > the page allocator, which is not subjected to kmemleak. > > Fixes: 90134ac9cabb ("KVM: arm64: Protect the .hyp sections from the host") > Signed-off-by: Marc Zyngier > Cc: Quentin Perret > Cc: Catalin Marinas > Cc: stable@vger.kernel.org # 5.13 > --- > arch/arm64/kvm/arm.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c > index e9a2b8f27792..23f12e602878 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -15,6 +15,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -1960,8 +1961,12 @@ static inline int pkvm_mark_hyp(phys_addr_t start, phys_addr_t end) > } > > #define pkvm_mark_hyp_section(__section) \ > +({ \ > + u64 sz = __section##_end - __section##_start; \ > + kmemleak_free_part(__section##_start, sz); \ > pkvm_mark_hyp(__pa_symbol(__section##_start), \ > - __pa_symbol(__section##_end)) > + __pa_symbol(__section##_end)); \ > +}) At some point we should also look into unmapping these sections from EL1 stage-1 as well, as that should lead to better error messages in case the host accesses hyp-private memory some other way. But this patch makes sense on its own, so: Reviewed-by: Quentin Perret Thanks, Quentin _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm