* [PATCH] arm: KVM: fix possible misalignment of PGDs and bounce page
@ 2014-03-28 14:25 Mark Salter
2014-03-28 19:37 ` Christoffer Dall
0 siblings, 1 reply; 5+ messages in thread
From: Mark Salter @ 2014-03-28 14:25 UTC (permalink / raw)
To: linux-arm-kernel
The kvm/mmu code shared by arm and arm64 uses kalloc() to allocate
a bounce page (if hypervisor init code crosses page boundary) and
hypervisor PGDs. The problem is that kalloc() does not guarantee
the proper alignment. In the case of the bounce page, the page sized
buffer allocated may also cross a page boundary negating the purpose
and leading to a hang during kvm initialization. Likewise the PGDs
allocated may not meet the minimum alignment requirements of the
underlying MMU. This patch uses __get_free_page() to guarantee the
worst case alignment needs of the bounce page and PGDs on both arm
and arm64.
Signed-off-by: Mark Salter <msalter@redhat.com>
---
arch/arm/kvm/mmu.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 7789857..575d790 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -42,6 +42,8 @@ static unsigned long hyp_idmap_start;
static unsigned long hyp_idmap_end;
static phys_addr_t hyp_idmap_vector;
+#define pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t))
+
#define kvm_pmd_huge(_x) (pmd_huge(_x) || pmd_trans_huge(_x))
static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
@@ -199,14 +201,14 @@ void free_boot_hyp_pgd(void)
if (boot_hyp_pgd) {
unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
- kfree(boot_hyp_pgd);
+ free_pages((unsigned long)boot_hyp_pgd, pgd_order);
boot_hyp_pgd = NULL;
}
if (hyp_pgd)
unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
- kfree(init_bounce_page);
+ free_page((unsigned long)init_bounce_page);
init_bounce_page = NULL;
mutex_unlock(&kvm_hyp_pgd_mutex);
@@ -236,7 +238,7 @@ void free_hyp_pgds(void)
for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
- kfree(hyp_pgd);
+ free_pages((unsigned long)hyp_pgd, pgd_order);
hyp_pgd = NULL;
}
@@ -930,7 +932,7 @@ int kvm_mmu_init(void)
size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
phys_addr_t phys_base;
- init_bounce_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ init_bounce_page = (void *)__get_free_page(GFP_KERNEL);
if (!init_bounce_page) {
kvm_err("Couldn't allocate HYP init bounce page\n");
err = -ENOMEM;
@@ -956,8 +958,9 @@ int kvm_mmu_init(void)
(unsigned long)phys_base);
}
- hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
- boot_hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
+ hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, pgd_order);
+ boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, pgd_order);
+
if (!hyp_pgd || !boot_hyp_pgd) {
kvm_err("Hyp mode PGD not allocated\n");
err = -ENOMEM;
--
1.8.5.3
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH] arm: KVM: fix possible misalignment of PGDs and bounce page
2014-03-28 14:25 [PATCH] arm: KVM: fix possible misalignment of PGDs and bounce page Mark Salter
@ 2014-03-28 19:37 ` Christoffer Dall
2014-03-29 14:01 ` Marc Zyngier
0 siblings, 1 reply; 5+ messages in thread
From: Christoffer Dall @ 2014-03-28 19:37 UTC (permalink / raw)
To: linux-arm-kernel
On Fri, Mar 28, 2014 at 10:25:19AM -0400, Mark Salter wrote:
> The kvm/mmu code shared by arm and arm64 uses kalloc() to allocate
> a bounce page (if hypervisor init code crosses page boundary) and
> hypervisor PGDs. The problem is that kalloc() does not guarantee
> the proper alignment. In the case of the bounce page, the page sized
> buffer allocated may also cross a page boundary negating the purpose
> and leading to a hang during kvm initialization. Likewise the PGDs
> allocated may not meet the minimum alignment requirements of the
> underlying MMU. This patch uses __get_free_page() to guarantee the
> worst case alignment needs of the bounce page and PGDs on both arm
> and arm64.
>
> Signed-off-by: Mark Salter <msalter@redhat.com>
> ---
> arch/arm/kvm/mmu.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> index 7789857..575d790 100644
> --- a/arch/arm/kvm/mmu.c
> +++ b/arch/arm/kvm/mmu.c
> @@ -42,6 +42,8 @@ static unsigned long hyp_idmap_start;
> static unsigned long hyp_idmap_end;
> static phys_addr_t hyp_idmap_vector;
>
> +#define pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t))
> +
> #define kvm_pmd_huge(_x) (pmd_huge(_x) || pmd_trans_huge(_x))
>
> static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
> @@ -199,14 +201,14 @@ void free_boot_hyp_pgd(void)
> if (boot_hyp_pgd) {
> unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
> unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
> - kfree(boot_hyp_pgd);
> + free_pages((unsigned long)boot_hyp_pgd, pgd_order);
> boot_hyp_pgd = NULL;
> }
>
> if (hyp_pgd)
> unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
>
> - kfree(init_bounce_page);
> + free_page((unsigned long)init_bounce_page);
> init_bounce_page = NULL;
>
> mutex_unlock(&kvm_hyp_pgd_mutex);
> @@ -236,7 +238,7 @@ void free_hyp_pgds(void)
> for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE)
> unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
>
> - kfree(hyp_pgd);
> + free_pages((unsigned long)hyp_pgd, pgd_order);
> hyp_pgd = NULL;
> }
>
> @@ -930,7 +932,7 @@ int kvm_mmu_init(void)
> size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
> phys_addr_t phys_base;
>
> - init_bounce_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
> + init_bounce_page = (void *)__get_free_page(GFP_KERNEL);
> if (!init_bounce_page) {
> kvm_err("Couldn't allocate HYP init bounce page\n");
> err = -ENOMEM;
> @@ -956,8 +958,9 @@ int kvm_mmu_init(void)
> (unsigned long)phys_base);
> }
>
> - hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
> - boot_hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
> + hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, pgd_order);
> + boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, pgd_order);
> +
> if (!hyp_pgd || !boot_hyp_pgd) {
> kvm_err("Hyp mode PGD not allocated\n");
> err = -ENOMEM;
> --
> 1.8.5.3
>
This looks right to me. Funnily enough I seem to remember a discussion
from when we originally merged this code where someone (maybe me) argued
that kmalloc() would align to the size of the allocation, but I don't
see anything backing this up at this point.
So:
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
If Marc agrees I can queue this for -rc1.
^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH] arm: KVM: fix possible misalignment of PGDs and bounce page
2014-03-28 19:37 ` Christoffer Dall
@ 2014-03-29 14:01 ` Marc Zyngier
2014-04-25 17:01 ` Mark Salter
0 siblings, 1 reply; 5+ messages in thread
From: Marc Zyngier @ 2014-03-29 14:01 UTC (permalink / raw)
To: linux-arm-kernel
On 2014-03-28 19:37, Christoffer Dall wrote:
> On Fri, Mar 28, 2014 at 10:25:19AM -0400, Mark Salter wrote:
>> The kvm/mmu code shared by arm and arm64 uses kalloc() to allocate
>> a bounce page (if hypervisor init code crosses page boundary) and
>> hypervisor PGDs. The problem is that kalloc() does not guarantee
>> the proper alignment. In the case of the bounce page, the page sized
>> buffer allocated may also cross a page boundary negating the purpose
>> and leading to a hang during kvm initialization. Likewise the PGDs
>> allocated may not meet the minimum alignment requirements of the
>> underlying MMU. This patch uses __get_free_page() to guarantee the
>> worst case alignment needs of the bounce page and PGDs on both arm
>> and arm64.
>>
>> Signed-off-by: Mark Salter <msalter@redhat.com>
>> ---
>> arch/arm/kvm/mmu.c | 15 +++++++++------
>> 1 file changed, 9 insertions(+), 6 deletions(-)
>>
>> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
>> index 7789857..575d790 100644
>> --- a/arch/arm/kvm/mmu.c
>> +++ b/arch/arm/kvm/mmu.c
>> @@ -42,6 +42,8 @@ static unsigned long hyp_idmap_start;
>> static unsigned long hyp_idmap_end;
>> static phys_addr_t hyp_idmap_vector;
>>
>> +#define pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t))
>> +
>> #define kvm_pmd_huge(_x) (pmd_huge(_x) || pmd_trans_huge(_x))
>>
>> static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t
>> ipa)
>> @@ -199,14 +201,14 @@ void free_boot_hyp_pgd(void)
>> if (boot_hyp_pgd) {
>> unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
>> unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
>> - kfree(boot_hyp_pgd);
>> + free_pages((unsigned long)boot_hyp_pgd, pgd_order);
>> boot_hyp_pgd = NULL;
>> }
>>
>> if (hyp_pgd)
>> unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
>>
>> - kfree(init_bounce_page);
>> + free_page((unsigned long)init_bounce_page);
>> init_bounce_page = NULL;
>>
>> mutex_unlock(&kvm_hyp_pgd_mutex);
>> @@ -236,7 +238,7 @@ void free_hyp_pgds(void)
>> for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr +=
>> PGDIR_SIZE)
>> unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
>>
>> - kfree(hyp_pgd);
>> + free_pages((unsigned long)hyp_pgd, pgd_order);
>> hyp_pgd = NULL;
>> }
>>
>> @@ -930,7 +932,7 @@ int kvm_mmu_init(void)
>> size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
>> phys_addr_t phys_base;
>>
>> - init_bounce_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
>> + init_bounce_page = (void *)__get_free_page(GFP_KERNEL);
>> if (!init_bounce_page) {
>> kvm_err("Couldn't allocate HYP init bounce page\n");
>> err = -ENOMEM;
>> @@ -956,8 +958,9 @@ int kvm_mmu_init(void)
>> (unsigned long)phys_base);
>> }
>>
>> - hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
>> - boot_hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
>> + hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
>> pgd_order);
>> + boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
>> pgd_order);
>> +
>> if (!hyp_pgd || !boot_hyp_pgd) {
>> kvm_err("Hyp mode PGD not allocated\n");
>> err = -ENOMEM;
>> --
>> 1.8.5.3
>>
> This looks right to me. Funnily enough I seem to remember a
> discussion
> from when we originally merged this code where someone (maybe me)
> argued
> that kmalloc() would align to the size of the allocation, but I don't
> see anything backing this up at this point.
>
> So:
>
> Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
>
> If Marc agrees I can queue this for -rc1.
Looks good to me indeed.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
M.
--
Fast, cheap, reliable. Pick two.
^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH] arm: KVM: fix possible misalignment of PGDs and bounce page
2014-03-29 14:01 ` Marc Zyngier
@ 2014-04-25 17:01 ` Mark Salter
2014-04-25 17:28 ` Marc Zyngier
0 siblings, 1 reply; 5+ messages in thread
From: Mark Salter @ 2014-04-25 17:01 UTC (permalink / raw)
To: linux-arm-kernel
Ping. Can we get this into 3.15rc as a bug fix? Anything I can help
with?
--Mark
On Sat, 2014-03-29 at 14:01 +0000, Marc Zyngier wrote:
> On 2014-03-28 19:37, Christoffer Dall wrote:
> > On Fri, Mar 28, 2014 at 10:25:19AM -0400, Mark Salter wrote:
> >> The kvm/mmu code shared by arm and arm64 uses kalloc() to allocate
> >> a bounce page (if hypervisor init code crosses page boundary) and
> >> hypervisor PGDs. The problem is that kalloc() does not guarantee
> >> the proper alignment. In the case of the bounce page, the page sized
> >> buffer allocated may also cross a page boundary negating the purpose
> >> and leading to a hang during kvm initialization. Likewise the PGDs
> >> allocated may not meet the minimum alignment requirements of the
> >> underlying MMU. This patch uses __get_free_page() to guarantee the
> >> worst case alignment needs of the bounce page and PGDs on both arm
> >> and arm64.
> >>
> >> Signed-off-by: Mark Salter <msalter@redhat.com>
> >> ---
> >> arch/arm/kvm/mmu.c | 15 +++++++++------
> >> 1 file changed, 9 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> >> index 7789857..575d790 100644
> >> --- a/arch/arm/kvm/mmu.c
> >> +++ b/arch/arm/kvm/mmu.c
> >> @@ -42,6 +42,8 @@ static unsigned long hyp_idmap_start;
> >> static unsigned long hyp_idmap_end;
> >> static phys_addr_t hyp_idmap_vector;
> >>
> >> +#define pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t))
> >> +
> >> #define kvm_pmd_huge(_x) (pmd_huge(_x) || pmd_trans_huge(_x))
> >>
> >> static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t
> >> ipa)
> >> @@ -199,14 +201,14 @@ void free_boot_hyp_pgd(void)
> >> if (boot_hyp_pgd) {
> >> unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
> >> unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
> >> - kfree(boot_hyp_pgd);
> >> + free_pages((unsigned long)boot_hyp_pgd, pgd_order);
> >> boot_hyp_pgd = NULL;
> >> }
> >>
> >> if (hyp_pgd)
> >> unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
> >>
> >> - kfree(init_bounce_page);
> >> + free_page((unsigned long)init_bounce_page);
> >> init_bounce_page = NULL;
> >>
> >> mutex_unlock(&kvm_hyp_pgd_mutex);
> >> @@ -236,7 +238,7 @@ void free_hyp_pgds(void)
> >> for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr +=
> >> PGDIR_SIZE)
> >> unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
> >>
> >> - kfree(hyp_pgd);
> >> + free_pages((unsigned long)hyp_pgd, pgd_order);
> >> hyp_pgd = NULL;
> >> }
> >>
> >> @@ -930,7 +932,7 @@ int kvm_mmu_init(void)
> >> size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
> >> phys_addr_t phys_base;
> >>
> >> - init_bounce_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
> >> + init_bounce_page = (void *)__get_free_page(GFP_KERNEL);
> >> if (!init_bounce_page) {
> >> kvm_err("Couldn't allocate HYP init bounce page\n");
> >> err = -ENOMEM;
> >> @@ -956,8 +958,9 @@ int kvm_mmu_init(void)
> >> (unsigned long)phys_base);
> >> }
> >>
> >> - hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
> >> - boot_hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
> >> + hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
> >> pgd_order);
> >> + boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
> >> pgd_order);
> >> +
> >> if (!hyp_pgd || !boot_hyp_pgd) {
> >> kvm_err("Hyp mode PGD not allocated\n");
> >> err = -ENOMEM;
> >> --
> >> 1.8.5.3
> >>
> > This looks right to me. Funnily enough I seem to remember a
> > discussion
> > from when we originally merged this code where someone (maybe me)
> > argued
> > that kmalloc() would align to the size of the allocation, but I don't
> > see anything backing this up at this point.
> >
> > So:
> >
> > Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
> >
> > If Marc agrees I can queue this for -rc1.
>
> Looks good to me indeed.
>
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
>
> M.
^ permalink raw reply [flat|nested] 5+ messages in thread* [PATCH] arm: KVM: fix possible misalignment of PGDs and bounce page
2014-04-25 17:01 ` Mark Salter
@ 2014-04-25 17:28 ` Marc Zyngier
0 siblings, 0 replies; 5+ messages in thread
From: Marc Zyngier @ 2014-04-25 17:28 UTC (permalink / raw)
To: linux-arm-kernel
On 25/04/14 18:01, Mark Salter wrote:
> Ping. Can we get this into 3.15rc as a bug fix? Anything I can help
> with?
It sure has to go in. I'll queue it.
Thanks for the reminder.
M.
> On Sat, 2014-03-29 at 14:01 +0000, Marc Zyngier wrote:
>> On 2014-03-28 19:37, Christoffer Dall wrote:
>>> On Fri, Mar 28, 2014 at 10:25:19AM -0400, Mark Salter wrote:
>>>> The kvm/mmu code shared by arm and arm64 uses kalloc() to allocate
>>>> a bounce page (if hypervisor init code crosses page boundary) and
>>>> hypervisor PGDs. The problem is that kalloc() does not guarantee
>>>> the proper alignment. In the case of the bounce page, the page sized
>>>> buffer allocated may also cross a page boundary negating the purpose
>>>> and leading to a hang during kvm initialization. Likewise the PGDs
>>>> allocated may not meet the minimum alignment requirements of the
>>>> underlying MMU. This patch uses __get_free_page() to guarantee the
>>>> worst case alignment needs of the bounce page and PGDs on both arm
>>>> and arm64.
>>>>
>>>> Signed-off-by: Mark Salter <msalter@redhat.com>
>>>> ---
>>>> arch/arm/kvm/mmu.c | 15 +++++++++------
>>>> 1 file changed, 9 insertions(+), 6 deletions(-)
>>>>
>>>> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
>>>> index 7789857..575d790 100644
>>>> --- a/arch/arm/kvm/mmu.c
>>>> +++ b/arch/arm/kvm/mmu.c
>>>> @@ -42,6 +42,8 @@ static unsigned long hyp_idmap_start;
>>>> static unsigned long hyp_idmap_end;
>>>> static phys_addr_t hyp_idmap_vector;
>>>>
>>>> +#define pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t))
>>>> +
>>>> #define kvm_pmd_huge(_x) (pmd_huge(_x) || pmd_trans_huge(_x))
>>>>
>>>> static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t
>>>> ipa)
>>>> @@ -199,14 +201,14 @@ void free_boot_hyp_pgd(void)
>>>> if (boot_hyp_pgd) {
>>>> unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE);
>>>> unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
>>>> - kfree(boot_hyp_pgd);
>>>> + free_pages((unsigned long)boot_hyp_pgd, pgd_order);
>>>> boot_hyp_pgd = NULL;
>>>> }
>>>>
>>>> if (hyp_pgd)
>>>> unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE);
>>>>
>>>> - kfree(init_bounce_page);
>>>> + free_page((unsigned long)init_bounce_page);
>>>> init_bounce_page = NULL;
>>>>
>>>> mutex_unlock(&kvm_hyp_pgd_mutex);
>>>> @@ -236,7 +238,7 @@ void free_hyp_pgds(void)
>>>> for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr +=
>>>> PGDIR_SIZE)
>>>> unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE);
>>>>
>>>> - kfree(hyp_pgd);
>>>> + free_pages((unsigned long)hyp_pgd, pgd_order);
>>>> hyp_pgd = NULL;
>>>> }
>>>>
>>>> @@ -930,7 +932,7 @@ int kvm_mmu_init(void)
>>>> size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start;
>>>> phys_addr_t phys_base;
>>>>
>>>> - init_bounce_page = kmalloc(PAGE_SIZE, GFP_KERNEL);
>>>> + init_bounce_page = (void *)__get_free_page(GFP_KERNEL);
>>>> if (!init_bounce_page) {
>>>> kvm_err("Couldn't allocate HYP init bounce page\n");
>>>> err = -ENOMEM;
>>>> @@ -956,8 +958,9 @@ int kvm_mmu_init(void)
>>>> (unsigned long)phys_base);
>>>> }
>>>>
>>>> - hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
>>>> - boot_hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
>>>> + hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
>>>> pgd_order);
>>>> + boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
>>>> pgd_order);
>>>> +
>>>> if (!hyp_pgd || !boot_hyp_pgd) {
>>>> kvm_err("Hyp mode PGD not allocated\n");
>>>> err = -ENOMEM;
>>>> --
>>>> 1.8.5.3
>>>>
>>> This looks right to me. Funnily enough I seem to remember a
>>> discussion
>>> from when we originally merged this code where someone (maybe me)
>>> argued
>>> that kmalloc() would align to the size of the allocation, but I don't
>>> see anything backing this up at this point.
>>>
>>> So:
>>>
>>> Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
>>>
>>> If Marc agrees I can queue this for -rc1.
>>
>> Looks good to me indeed.
>>
>> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
>>
>> M.
>
>
>
--
Jazz is not dead. It just smells funny...
^ permalink raw reply [flat|nested] 5+ messages in thread
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2014-03-28 14:25 [PATCH] arm: KVM: fix possible misalignment of PGDs and bounce page Mark Salter
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2014-04-25 17:01 ` Mark Salter
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as well as URLs for NNTP newsgroup(s).