linux-kernel - Re: [PATCH v5 5/5] x86/kvm: Avoid dynamic allocation of pvclock data when SEV is active

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Date:   Thu, 6 Sep 2018 22:57:16 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     brijesh.singh@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...e.de>, "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH v5 5/5] x86/kvm: Avoid dynamic allocation of pvclock data
 when SEV is active



On 9/6/18 1:50 PM, Brijesh Singh wrote:
...

>>
>> #define HVC_DECRYPTED_ARRAY_SIZE  \
>>     PAGE_ALIGN((NR_CPUS - HVC_BOOT_ARRAY_SIZE) * \
>>            sizeof(struct pvclock_vsyscall_time_info))
>>
>

Since the hv_clock_aux array will have NR_CPUS elements hence the
following definition is all we need.

#ifdef CONFIG_AMD_MEM_ENCRYPT
static struct pvclock_vsyscall_time_info
                            hv_clock_aux[NR_CPUS] __decrypted_aux;
#endif


> Sure works for me.
>
>>> +static struct pvclock_vsyscall_time_info
>>> +            hv_clock_dec[HVC_DECRYPTED_ARRAY_SIZE]
>>> __decrypted_hvclock;
>>> +