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Message-ID: <ZQyqSI0HOmamJbWn@google.com>
Date: Thu, 21 Sep 2023 13:40:40 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: isaku.yamahata@...el.com
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
isaku.yamahata@...il.com, Michael Roth <michael.roth@....com>,
Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
Sagi Shahar <sagis@...gle.com>,
David Matlack <dmatlack@...gle.com>,
Kai Huang <kai.huang@...el.com>,
Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
linux-coco@...ts.linux.dev,
Chao Peng <chao.p.peng@...ux.intel.com>,
Ackerley Tng <ackerleytng@...gle.com>,
Vishal Annapurve <vannapurve@...gle.com>,
Yuan Yao <yuan.yao@...ux.intel.com>,
Jarkko Sakkinen <jarkko@...nel.org>,
Xu Yilun <yilun.xu@...el.com>,
Quentin Perret <qperret@...gle.com>, wei.w.wang@...el.com,
Fuad Tabba <tabba@...gle.com>
Subject: Re: [RFC PATCH v2 3/6] KVM: selftests: Add tests for punch hole on guest_memfd
On Thu, Sep 21, 2023, isaku.yamahata@...el.com wrote:
> From: Isaku Yamahata <isaku.yamahata@...el.com>
>
> Punch hole implies the region is zeroed out. Add tests if the punched
> region has zero.
> Oppertunistically Remove unused member, pattern, in guest_run_test().
Heh, I didn't pretty much all the same stuff, except I opted to have
SET_ATTRIBUTE instead of FALLOCATE_ONLY, e.g. in case we end up with a test that's
wants a thrid flavor (or somehow neither?).
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> ---
> .../kvm/x86_64/private_mem_conversions_test.c | 26 ++++++++++++++-----
> 1 file changed, 20 insertions(+), 6 deletions(-)
>
...
> @@ -156,6 +163,10 @@ static void guest_run_test(uint64_t base_gpa, bool do_fallocate)
>
> if (size > PAGE_SIZE) {
> memset((void *)gpa, p2, PAGE_SIZE);
> +
> + /* Test if punch hole results in zeroing page. */
> + guest_punch_hole_private(gpa, PAGE_SIZE);
> + memcmp_g(gpa, 0, PAGE_SIZE);
I added a dedicated sub-test to provide a bit more variety in the tests. I highly
doubt my version will ever find a bug that isn't caught by this approach, but if
nothing else, it's nice to have a completely separate sub-test.
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