Hello Alexey,
Thanks for your review!
Alexey Kardashevskiy <a...@ozlabs.ru> writes:
> On 13/07/2019 16:00, Thiago Jung Bauermann wrote:
>> From: Ram Pai <linux...@us.ibm.com>
>>
>> These functions are used when the guest wants to grant the hypervisor
>> access to certain pages.
>>
>> Signed-off-by: Ram Pai <linux...@us.ibm.com>
>> Signed-off-by: Thiago Jung Bauermann <bauer...@linux.ibm.com>
>> ---
>> arch/powerpc/include/asm/ultravisor-api.h | 2 ++
>> arch/powerpc/include/asm/ultravisor.h | 15 +++++++++++++++
>> 2 files changed, 17 insertions(+)
>>
>> diff --git a/arch/powerpc/include/asm/ultravisor-api.h
>> b/arch/powerpc/include/asm/ultravisor-api.h
>> index fe9a0d8d7673..c7513bbadf57 100644
>> --- a/arch/powerpc/include/asm/ultravisor-api.h
>> +++ b/arch/powerpc/include/asm/ultravisor-api.h
>> @@ -25,6 +25,8 @@
>> #define UV_UNREGISTER_MEM_SLOT 0xF124
>> #define UV_PAGE_IN 0xF128
>> #define UV_PAGE_OUT 0xF12C
>> +#define UV_SHARE_PAGE 0xF130
>> +#define UV_UNSHARE_PAGE 0xF134
>> #define UV_PAGE_INVAL 0xF138
>> #define UV_SVM_TERMINATE 0xF13C
>> diff --git a/arch/powerpc/include/asm/ultravisor.h
>> b/arch/powerpc/include/asm/ultravisor.h
>> index f5dc5af739b8..f7418b663a0e 100644
>> --- a/arch/powerpc/include/asm/ultravisor.h
>> +++ b/arch/powerpc/include/asm/ultravisor.h
>> @@ -91,6 +91,21 @@ static inline int uv_svm_terminate(u64 lpid)
>> return ucall(UV_SVM_TERMINATE, retbuf, lpid);
>> }
>> +
>> +static inline int uv_share_page(u64 pfn, u64 npages)
>> +{
>> + unsigned long retbuf[UCALL_BUFSIZE];
>> +
>> + return ucall(UV_SHARE_PAGE, retbuf, pfn, npages);
>
>
> What is in that retbuf? Can you pass NULL instead?
I think so, that buffer isn't used actually. Claudio is working on a
ucall_norets() which doesn't take the buffer and I can switch to that.
--
Thiago Jung Bauermann
IBM Linux Technology Center
