lkml.org 
[lkml]   [2018]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 1/2] add a function(ioremap_encrypted) for kdump when AMD sme enabled.
From
Date


在 2018年05月15日 22:34, Tom Lendacky 写道:
> On 5/14/2018 8:51 PM, Lianbo Jiang wrote:
>> It is convenient to remap the old memory encrypted to the second kernel
>> by calling ioremap_encrypted().
>>
>> Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
>> ---
>> arch/x86/include/asm/io.h | 2 ++
>> arch/x86/mm/ioremap.c | 25 +++++++++++++++++--------
>> 2 files changed, 19 insertions(+), 8 deletions(-)
>>
>> diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
>> index f6e5b93..06d2a9f 100644
>> --- a/arch/x86/include/asm/io.h
>> +++ b/arch/x86/include/asm/io.h
>> @@ -192,6 +192,8 @@ extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
>> #define ioremap_cache ioremap_cache
>> extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size, unsigned long prot_val);
>> #define ioremap_prot ioremap_prot
>> +extern void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size);
>> +#define ioremap_encrypted ioremap_encrypted
>>
>> /**
>> * ioremap - map bus memory into CPU space
>> diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
>> index c63a545..7a52d1e 100644
>> --- a/arch/x86/mm/ioremap.c
>> +++ b/arch/x86/mm/ioremap.c
>> @@ -131,7 +131,8 @@ static void __ioremap_check_mem(resource_size_t addr, unsigned long size,
>> * caller shouldn't need to know that small detail.
>> */
>> static void __iomem *__ioremap_caller(resource_size_t phys_addr,
>> - unsigned long size, enum page_cache_mode pcm, void *caller)
>> + unsigned long size, enum page_cache_mode pcm,
>> + void *caller, bool encrypted)
>> {
>> unsigned long offset, vaddr;
>> resource_size_t last_addr;
>> @@ -199,7 +200,8 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
>> * resulting mapping.
>> */
>> prot = PAGE_KERNEL_IO;
>> - if (sev_active() && mem_flags.desc_other)
>> + if ((sev_active() && mem_flags.desc_other) ||
>> + (encrypted && sme_active()))
>
> You only need the encrypted check here. If sme is not active,
> then the pgprot_encrypted will basically be a no-op.
>
Great! Thank you, Tom.
It will be fixed.

Lianbo
> Also, extra indents.
>
> Thanks,
> Tom
>
>> prot = pgprot_encrypted(prot);
>>
>> switch (pcm) {
>> @@ -291,7 +293,7 @@ void __iomem *ioremap_nocache(resource_size_t phys_addr, unsigned long size)
>> enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC_MINUS;
>>
>> return __ioremap_caller(phys_addr, size, pcm,
>> - __builtin_return_address(0));
>> + __builtin_return_address(0), false);
>> }
>> EXPORT_SYMBOL(ioremap_nocache);
>>
>> @@ -324,7 +326,7 @@ void __iomem *ioremap_uc(resource_size_t phys_addr, unsigned long size)
>> enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC;
>>
>> return __ioremap_caller(phys_addr, size, pcm,
>> - __builtin_return_address(0));
>> + __builtin_return_address(0), false);
>> }
>> EXPORT_SYMBOL_GPL(ioremap_uc);
>>
>> @@ -341,7 +343,7 @@ EXPORT_SYMBOL_GPL(ioremap_uc);
>> void __iomem *ioremap_wc(resource_size_t phys_addr, unsigned long size)
>> {
>> return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WC,
>> - __builtin_return_address(0));
>> + __builtin_return_address(0), false);
>> }
>> EXPORT_SYMBOL(ioremap_wc);
>>
>> @@ -358,14 +360,21 @@ EXPORT_SYMBOL(ioremap_wc);
>> void __iomem *ioremap_wt(resource_size_t phys_addr, unsigned long size)
>> {
>> return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WT,
>> - __builtin_return_address(0));
>> + __builtin_return_address(0), false);
>> }
>> EXPORT_SYMBOL(ioremap_wt);
>>
>> +void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size)
>> +{
>> + return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WB,
>> + __builtin_return_address(0), true);
>> +}
>> +EXPORT_SYMBOL(ioremap_encrypted);
>> +
>> void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size)
>> {
>> return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WB,
>> - __builtin_return_address(0));
>> + __builtin_return_address(0), false);
>> }
>> EXPORT_SYMBOL(ioremap_cache);
>>
>> @@ -374,7 +383,7 @@ void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
>> {
>> return __ioremap_caller(phys_addr, size,
>> pgprot2cachemode(__pgprot(prot_val)),
>> - __builtin_return_address(0));
>> + __builtin_return_address(0), false);
>> }
>> EXPORT_SYMBOL(ioremap_prot);
>>
>>

\
 
 \ /
  Last update: 2018-05-16 15:21    [W:0.033 / U:16.056 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site