From: Dave Hansen <dave.hansen@intel.com>
To: Dexuan Cui <decui@microsoft.com>,
ak@linux.intel.com, arnd@arndb.de, bp@alien8.de,
brijesh.singh@amd.com, dan.j.williams@intel.com,
dave.hansen@linux.intel.com, haiyangz@microsoft.com,
hpa@zytor.com, jane.chu@oracle.com,
kirill.shutemov@linux.intel.com, kys@microsoft.com,
linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org,
luto@kernel.org, mingo@redhat.com, peterz@infradead.org,
rostedt@goodmis.org, sathyanarayanan.kuppuswamy@linux.intel.com,
seanjc@google.com, tglx@linutronix.de, tony.luck@intel.com,
wei.liu@kernel.org, x86@kernel.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/6] x86/tdx: Support vmalloc() for tdx_enc_status_changed()
Date: Mon, 21 Nov 2022 13:00:35 -0800 [thread overview]
Message-ID: <8d3ac4ca-055a-5d54-602c-e378643ad9cd@intel.com> (raw)
In-Reply-To: <20221121195151.21812-4-decui@microsoft.com>
On 11/21/22 11:51, Dexuan Cui wrote:
> -static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc)
> +static bool tdx_enc_status_changed_for_contiguous_pages(unsigned long vaddr,
> + int numpages, bool enc)
That naming is unfortunate.
First, it's getting way too long.
Second, you don't need two of these functions because it's contiguous or
not. It's because tdx_enc_status_changed() only works on the direct map.
> {
> phys_addr_t start = __pa(vaddr);
> phys_addr_t end = __pa(vaddr + numpages * PAGE_SIZE);
> @@ -798,6 +800,47 @@ static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc)
> return true;
> }
>
> +static bool tdx_enc_status_changed_for_vmalloc(unsigned long vaddr,
> + int numpages, bool enc)
> +{
> + void *start_va = (void *)vaddr;
> + void *end_va = start_va + numpages * PAGE_SIZE;
> + phys_addr_t pa;
> +
> + if (offset_in_page(vaddr) != 0)
> + return false;
> +
> + while (start_va < end_va) {
> + pa = slow_virt_to_phys(start_va);
> + if (!enc)
> + pa |= cc_mkdec(0);
> +
> + if (!tdx_map_gpa(pa, pa + PAGE_SIZE, enc))
> + return false;
> +
> + /*
> + * private->shared conversion requires only MapGPA call.
> + *
> + * For shared->private conversion, accept the page using
> + * TDX_ACCEPT_PAGE TDX module call.
> + */
> + if (enc && !try_accept_one(&pa, PAGE_SIZE, PG_LEVEL_4K))
> + return false;
Don't we support large vmalloc() mappings these days?
> + start_va += PAGE_SIZE;
> + }
> +
> + return true;
> +}
I really don't like the copy-and-paste fork here.
I'd almost just rather have this *one* "vmalloc" copy that does
slow_virt_to_phys() on direct map addresses than have two copies.
Can you please look into making *one* function that works on either kind
of mapping?
> +static bool tdx_enc_status_changed(unsigned long vaddr, int numpages, bool enc)
> +{
> + if (is_vmalloc_addr((void *)vaddr))
> + return tdx_enc_status_changed_for_vmalloc(vaddr, numpages, enc);
> +
> + return tdx_enc_status_changed_for_contiguous_pages(vaddr, numpages, enc);
> +}
> +
> void __init tdx_early_init(void)
> {
> u64 cc_mask;
next prev parent reply other threads:[~2022-11-21 21:00 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-21 19:51 [PATCH 0/6] Support TDX guests on Hyper-V Dexuan Cui
2022-11-21 19:51 ` [PATCH 1/6] x86/tdx: Support hypercalls for " Dexuan Cui
2022-11-21 20:38 ` Dave Hansen
2022-11-21 23:52 ` Kirill A. Shutemov
2022-11-23 1:37 ` Dexuan Cui
2022-11-23 1:56 ` Dexuan Cui
2022-11-23 16:04 ` Dave Hansen
2022-11-23 18:59 ` Dexuan Cui
2022-11-23 3:52 ` Sathyanarayanan Kuppuswamy
2022-11-23 14:40 ` Kirill A. Shutemov
2022-11-23 18:55 ` Dexuan Cui
2022-11-30 19:14 ` Dexuan Cui
2022-12-02 21:47 ` 'Kirill A. Shutemov'
2022-11-23 16:03 ` Dave Hansen
2022-11-21 19:51 ` [PATCH 2/6] x86/tdx: Retry TDVMCALL_MAP_GPA() when needed Dexuan Cui
2022-11-21 20:55 ` Dave Hansen
2022-11-23 2:55 ` Dexuan Cui
2022-11-22 0:01 ` Kirill A. Shutemov
2022-11-23 3:27 ` Dexuan Cui
2022-11-23 13:30 ` Michael Kelley (LINUX)
2022-11-28 0:07 ` Dexuan Cui
2022-11-21 19:51 ` [PATCH 3/6] x86/tdx: Support vmalloc() for tdx_enc_status_changed() Dexuan Cui
2022-11-21 21:00 ` Dave Hansen [this message]
2022-11-23 4:01 ` Dexuan Cui
2022-11-22 0:24 ` Kirill A. Shutemov
2022-11-23 23:51 ` Dexuan Cui
2022-11-24 7:51 ` Kirill A. Shutemov
2022-11-27 20:27 ` Dexuan Cui
2022-11-21 19:51 ` [PATCH 4/6] x86/hyperv: Add hv_isolation_type_tdx() to detect TDX guests Dexuan Cui
2022-11-21 21:01 ` Dave Hansen
2022-11-21 21:48 ` Borislav Petkov
2022-11-22 0:32 ` Sathyanarayanan Kuppuswamy
2022-11-23 19:13 ` Dexuan Cui
2022-11-21 19:51 ` [PATCH 5/6] x86/hyperv: Support hypercalls for " Dexuan Cui
2022-11-21 20:05 ` Dave Hansen
2022-11-23 2:14 ` Dexuan Cui
2022-11-23 14:47 ` Kirill A. Shutemov
2022-11-23 18:13 ` Dexuan Cui
2022-11-23 18:18 ` Sathyanarayanan Kuppuswamy
2022-11-23 19:07 ` Dexuan Cui
2022-11-23 14:45 ` Michael Kelley (LINUX)
2022-11-28 0:58 ` Dexuan Cui
2022-11-28 1:20 ` Michael Kelley (LINUX)
2022-11-28 1:36 ` Dexuan Cui
2022-11-28 1:21 ` Sathyanarayanan Kuppuswamy
2022-11-28 1:55 ` Dexuan Cui
2022-11-28 15:22 ` Dave Hansen
2022-11-28 19:03 ` Dexuan Cui
2022-11-28 19:11 ` Dave Hansen
2022-11-28 19:37 ` Dexuan Cui
2022-11-28 19:48 ` Dave Hansen
2022-11-28 20:36 ` Dexuan Cui
2022-11-28 21:15 ` Dave Hansen
2022-11-28 21:53 ` Dexuan Cui
2022-11-21 19:51 ` [PATCH 6/6] Drivers: hv: vmbus: Support " Dexuan Cui
2023-01-06 11:00 ` Zhi Wang
2023-01-09 6:59 ` Dexuan Cui
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