linux-kernel - Re: [PATCH 2/6] vmw_balloon: support 64-bit memory limit

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Message-ID: <5C8E9F70-0403-433E-8644-E6505FBE7DEF@vmware.com>
Date:   Fri, 8 Feb 2019 20:05:50 +0000
From:   Nadav Amit <namit@...are.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Arnd Bergmann <arnd@...db.de>, LKML <linux-kernel@...r.kernel.org>,
        Julien Freche <jfreche@...are.com>
Subject: Re: [PATCH 2/6] vmw_balloon: support 64-bit memory limit

> On Feb 8, 2019, at 3:13 AM, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> 
> On Wed, Feb 06, 2019 at 03:57:02PM -0800, Nadav Amit wrote:
>> From: Xavier Deguillard <xdeguillard@...are.com>
>> 
>> Currently, the balloon driver would fail to run if memory is greater
>> than 16TB of vRAM. Previous patches have already converted the balloon
>> target and size to 64-bit, so all that is left to do add is to avoid
>> asserting memory is smaller than 16TB if the hypervisor supports 64-bits
>> target.
>> 
>> The driver advertises a new capability VMW_BALLOON_64_BITS_TARGET.
>> Hypervisors that support 16TB of memory or more will report that this
>> capability is enabled.
>> 
>> Signed-off-by: Xavier Deguillard <xdeguillard@...are.com>
>> Signed-off-by: Nadav Amit <namit@...are.com>
>> ---
>> drivers/misc/vmw_balloon.c | 18 +++++++++++++++---
>> 1 file changed, 15 insertions(+), 3 deletions(-)
>> 
>> diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
>> index c4371ec132d3..f96dc3690ade 100644
>> --- a/drivers/misc/vmw_balloon.c
>> +++ b/drivers/misc/vmw_balloon.c
>> @@ -72,15 +72,26 @@ enum vmwballoon_capabilities {
>> 	VMW_BALLOON_BATCHED_CMDS		= (1 << 2),
>> 	VMW_BALLOON_BATCHED_2M_CMDS		= (1 << 3),
>> 	VMW_BALLOON_SIGNALLED_WAKEUP_CMD	= (1 << 4),
>> +	VMW_BALLOON_64_BIT_TARGET		= (1 << 5)
> 
> Nit, this should be BIT(5), right?
> 
> You can change that in a later patch...

Will do.