Patch "arm64: KVM: force cache clean on page fault when caches are off" has been added to the 3.14-stable tree

Patch "arm64: KVM: force cache clean on page fault when caches are off" has been added to the 3.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    arm64: KVM: force cache clean on page fault when caches are off

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-kvm-force-cache-clean-on-page-fault-when-caches-are-off.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 2d58b733c87689d3d5144e4ac94ea861cc729145 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier@arm.com>
Date: Tue, 14 Jan 2014 19:13:10 +0000
Subject: arm64: KVM: force cache clean on page fault when caches are off

From: Marc Zyngier <marc.zyngier@arm.com>

commit 2d58b733c87689d3d5144e4ac94ea861cc729145 upstream.

In order for the guest with caches off to observe data written
contained in a given page, we need to make sure that page is
committed to memory, and not just hanging in the cache (as
guest accesses are completely bypassing the cache until it
decides to enable it).

For this purpose, hook into the coherent_icache_guest_page
function and flush the region if the guest SCTLR_EL1
register doesn't show the MMU  and caches as being enabled.
The function also get renamed to coherent_cache_guest_page.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Cc: Shannon Zhao <shannon.zhao@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/include/asm/kvm_mmu.h   |    4 ++--
 arch/arm/kvm/mmu.c               |    4 ++--
 arch/arm64/include/asm/kvm_mmu.h |   16 ++++++++++++----
 3 files changed, 16 insertions(+), 8 deletions(-)

--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -116,8 +116,8 @@ static inline void kvm_set_s2pmd_writabl
 
 struct kvm;
 
-static inline void coherent_icache_guest_page(struct kvm *kvm, hva_t hva,
-					      unsigned long size)
+static inline void coherent_cache_guest_page(struct kvm_vcpu *vcpu, hva_t hva,
+					     unsigned long size)
 {
 	/*
 	 * If we are going to insert an instruction page and the icache is
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -717,7 +717,7 @@ static int user_mem_abort(struct kvm_vcp
 			kvm_set_s2pmd_writable(&new_pmd);
 			kvm_set_pfn_dirty(pfn);
 		}
-		coherent_icache_guest_page(kvm, hva & PMD_MASK, PMD_SIZE);
+		coherent_cache_guest_page(vcpu, hva & PMD_MASK, PMD_SIZE);
 		ret = stage2_set_pmd_huge(kvm, memcache, fault_ipa, &new_pmd);
 	} else {
 		pte_t new_pte = pfn_pte(pfn, PAGE_S2);
@@ -725,7 +725,7 @@ static int user_mem_abort(struct kvm_vcp
 			kvm_set_s2pte_writable(&new_pte);
 			kvm_set_pfn_dirty(pfn);
 		}
-		coherent_icache_guest_page(kvm, hva, PAGE_SIZE);
+		coherent_cache_guest_page(vcpu, hva, PAGE_SIZE);
 		ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, false);
 	}
 
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -106,7 +106,6 @@ static inline bool kvm_is_write_fault(un
 	return true;
 }
 
-static inline void kvm_clean_dcache_area(void *addr, size_t size) {}
 static inline void kvm_clean_pgd(pgd_t *pgd) {}
 static inline void kvm_clean_pmd_entry(pmd_t *pmd) {}
 static inline void kvm_clean_pte(pte_t *pte) {}
@@ -124,9 +123,19 @@ static inline void kvm_set_s2pmd_writabl
 
 struct kvm;
 
-static inline void coherent_icache_guest_page(struct kvm *kvm, hva_t hva,
-					      unsigned long size)
+#define kvm_flush_dcache_to_poc(a,l)	__flush_dcache_area((a), (l))
+
+static inline bool vcpu_has_cache_enabled(struct kvm_vcpu *vcpu)
 {
+	return (vcpu_sys_reg(vcpu, SCTLR_EL1) & 0b101) == 0b101;
+}
+
+static inline void coherent_cache_guest_page(struct kvm_vcpu *vcpu, hva_t hva,
+					     unsigned long size)
+{
+	if (!vcpu_has_cache_enabled(vcpu))
+		kvm_flush_dcache_to_poc((void *)hva, size);
+
 	if (!icache_is_aliasing()) {		/* PIPT */
 		flush_icache_range(hva, hva + size);
 	} else if (!icache_is_aivivt()) {	/* non ASID-tagged VIVT */
@@ -135,7 +144,6 @@ static inline void coherent_icache_guest
 	}
 }
 
-#define kvm_flush_dcache_to_poc(a,l)	__flush_dcache_area((a), (l))
 #define kvm_virt_to_phys(x)		__virt_to_phys((unsigned long)(x))
 
 #endif /* __ASSEMBLY__ */


Patches currently in stable-queue which might be from marc.zyngier@arm.com are

queue-3.14/kvm-arm-arm64-vgic-fix-gicd_icfgr-register-accesses.patch
queue-3.14/arm-kvm-introduce-per-vcpu-hyp-configuration-register.patch
queue-3.14/arm-kvm-fix-handling-of-trapped-64bit-coprocessor-accesses.patch
queue-3.14/kvm-arm64-vgic-fix-hyp-panic-with-64k-pages-on-juno-platform.patch
queue-3.14/arm64-kvm-force-cache-clean-on-page-fault-when-caches-are-off.patch
queue-3.14/arm-kvm-introduce-kvm_p-d_addr_end.patch
queue-3.14/arm64-kvm-flush-vm-pages-before-letting-the-guest-enable-caches.patch
queue-3.14/arm-kvm-force-cache-clean-on-page-fault-when-caches-are-off.patch
queue-3.14/arm-kvm-add-world-switch-for-amair-0-1.patch
queue-3.14/kvm-arm-vgic-fix-the-overlap-check-action-about-setting-the-gicd-gicc-base-address.patch
queue-3.14/arm64-kvm-use-inner-shareable-barriers-for-inner-shareable-maintenance.patch
queue-3.14/arm64-kvm-allows-discrimination-of-aarch32-sysreg-access.patch
queue-3.14/arm-kvm-trap-vm-system-registers-until-mmu-and-caches-are-on.patch
queue-3.14/arm-kvm-fix-ordering-of-64bit-coprocessor-accesses.patch
queue-3.14/arm64-kvm-trap-vm-system-registers-until-mmu-and-caches-are-on.patch