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pseries: More complete WIMG validation in H_ENTER code

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Currently our implementation of the H_ENTER hypercall, which inserts a
mapping in the hash page table assumes that only ordinary memory is ever
mapped, and only permits mapping attribute bits accordingly (WIMG==0010).

However, we intend to start adding emulated IO to the pseries platform
(and real IO with PCI passthrough on kvm) which means this simple test
will no longer suffice.

This patch extends the h_enter validation code to check if the given
address is a RAM address.  If it is it enforces WIMG==0010, otherwise
it assumes that it is an IO mapping and instead enforces WIMG=010x.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
David Gibson 2011-08-03 21:02:19 +00:00 • committed by Alexander Graf
parent 9dfef5aae4
commit f73a2575a3
3 changed files with 21 additions and 5 deletions
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1
hw/spapr.h
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@ -10,6 +10,7 @@ typedef struct sPAPREnvironment {
struct VIOsPAPRBus *vio_bus;
struct icp_state *icp;
target_phys_addr_t ram_limit;
void *htab;
long htab_size;
target_phys_addr_t fdt_addr, rtas_addr;