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KVM: PPC: Add cache flush on page map 

When we map a page that wasn't icache cleared before, do so when first
mapping it in KVM using the same information bits as the Linux mapping
logic. That way we are 100% sure that any page we map does not have stale
entries in the icache.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2012-08-03 13:56:33 +02:00
parent 04f995a544
commit 249ba1ee0f
6 changed files with 22 additions and 0 deletions
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1
arch/powerpc/include/asm/kvm_host.h
View File

@ -33,6 +33,7 @@
#include <asm/kvm_asm.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/cacheflush.h>
#define KVM_MAX_VCPUS NR_CPUS
#define KVM_MAX_VCORES NR_CPUS

12
arch/powerpc/include/asm/kvm_ppc.h
View File

@ -219,4 +219,16 @@ void kvmppc_claim_lpid(long lpid);
void kvmppc_free_lpid(long lpid);
void kvmppc_init_lpid(unsigned long nr_lpids);
static inline void kvmppc_mmu_flush_icache(pfn_t pfn)
{
/* Clear i-cache for new pages */
struct page *page;
page = pfn_to_page(pfn);
if (!test_bit(PG_arch_1, &page->flags)) {
flush_dcache_icache_page(page);
set_bit(PG_arch_1, &page->flags);
}
}
#endif /* __POWERPC_KVM_PPC_H__ */

3
arch/powerpc/kvm/book3s_32_mmu_host.c
View File

@ -211,6 +211,9 @@ int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte)
pteg1 |= PP_RWRX;
}
if (orig_pte->may_execute)
kvmppc_mmu_flush_icache(hpaddr >> PAGE_SHIFT);
local_irq_disable();
if (pteg[rr]) {

2
arch/powerpc/kvm/book3s_64_mmu_host.c
View File

@ -126,6 +126,8 @@ int kvmppc_mmu_map_page(struct kvm_vcpu *vcpu, struct kvmppc_pte *orig_pte)
if (!orig_pte->may_execute)
rflags |= HPTE_R_N;
else
kvmppc_mmu_flush_icache(hpaddr >> PAGE_SHIFT);
hash = hpt_hash(va, PTE_SIZE, MMU_SEGSIZE_256M);

3
arch/powerpc/kvm/e500_tlb.c
View File

@ -539,6 +539,9 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize,
ref, gvaddr, stlbe);
/* Clear i-cache for new pages */
kvmppc_mmu_flush_icache(pfn);
}
/* XXX only map the one-one case, for now use TLB0 */

1
arch/powerpc/mm/mem.c
View File

@ -469,6 +469,7 @@ void flush_dcache_icache_page(struct page *page)
__flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
#endif
}
EXPORT_SYMBOL(flush_dcache_icache_page);
void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
{