From: Dave Hansen <dave.hansen@intel.com>
To: Brijesh Singh <brijesh.singh@amd.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, linux-efi@vger.kernel.org,
platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev,
linux-mm@kvack.org, linux-crypto@vger.kernel.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Joerg Roedel <jroedel@suse.de>,
Tom Lendacky <thomas.lendacky@amd.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Ard Biesheuvel <ardb@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>,
Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Sergio Lopez <slp@redhat.com>, Peter Gonda <pgonda@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
David Rientjes <rientjes@google.com>,
Dov Murik <dovmurik@linux.ibm.com>,
Tobin Feldman-Fitzthum <tobin@ibm.com>,
Borislav Petkov <bp@alien8.de>,
Michael Roth <michael.roth@amd.com>,
Vlastimil Babka <vbabka@suse.cz>,
tony.luck@intel.com, npmccallum@redhat.com,
brijesh.ksingh@gmail.com
Subject: Re: [PATCH Part2 RFC v4 10/40] x86/fault: Add support to handle the RMP fault for user address
Date: Thu, 8 Jul 2021 09:16:21 -0700 [thread overview]
Message-ID: <3c6b6fc4-05b2-8d18-2eb8-1bd1a965c632@intel.com> (raw)
In-Reply-To: <20210707183616.5620-11-brijesh.singh@amd.com>
Oh, here's the THP code. The subject just changed.
On 7/7/21 11:35 AM, Brijesh Singh wrote:
> When SEV-SNP is enabled globally, a write from the host goes through the
> RMP check. When the host writes to pages, hardware checks the following
> conditions at the end of page walk:
>
> 1. Assigned bit in the RMP table is zero (i.e page is shared).
> 2. If the page table entry that gives the sPA indicates that the target
> page size is a large page, then all RMP entries for the 4KB
> constituting pages of the target must have the assigned bit 0.
> 3. Immutable bit in the RMP table is not zero.
>
> The hardware will raise page fault if one of the above conditions is not
> met. Try resolving the fault instead of taking fault again and again. If
> the host attempts to write to the guest private memory then send the
> SIGBUG signal to kill the process. If the page level between the host and
"SIGBUG"?
> RMP entry does not match, then split the address to keep the RMP and host
> page levels in sync.
> ---
> arch/x86/mm/fault.c | 69 +++++++++++++++++++++++++++++++++++++++++++++
> include/linux/mm.h | 6 +++-
> mm/memory.c | 13 +++++++++
> 3 files changed, 87 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
> index 195149eae9b6..cdf48019c1a7 100644
> --- a/arch/x86/mm/fault.c
> +++ b/arch/x86/mm/fault.c
> @@ -1281,6 +1281,58 @@ do_kern_addr_fault(struct pt_regs *regs, unsigned long hw_error_code,
> }
> NOKPROBE_SYMBOL(do_kern_addr_fault);
>
> +#define RMP_FAULT_RETRY 0
> +#define RMP_FAULT_KILL 1
> +#define RMP_FAULT_PAGE_SPLIT 2
> +
> +static inline size_t pages_per_hpage(int level)
> +{
> + return page_level_size(level) / PAGE_SIZE;
> +}
> +
> +static int handle_user_rmp_page_fault(unsigned long hw_error_code, unsigned long address)
> +{
> + unsigned long pfn, mask;
> + int rmp_level, level;
> + struct rmpentry *e;
> + pte_t *pte;
> +
> + if (unlikely(!cpu_feature_enabled(X86_FEATURE_SEV_SNP)))
> + return RMP_FAULT_KILL;
Shouldn't this be a WARN_ON_ONCE()? How can we get RMP faults without
SEV-SNP?
> + /* Get the native page level */
> + pte = lookup_address_in_mm(current->mm, address, &level);
> + if (unlikely(!pte))
> + return RMP_FAULT_KILL;
What would this mean? There was an RMP fault on a non-present page?
How could that happen? What if there was a race between an unmapping
event and the RMP fault delivery?
> + pfn = pte_pfn(*pte);
> + if (level > PG_LEVEL_4K) {
> + mask = pages_per_hpage(level) - pages_per_hpage(level - 1);
> + pfn |= (address >> PAGE_SHIFT) & mask;
> + }
This looks inherently racy. What happens if there are two parallel RMP
faults on the same 2M page. One of them splits the page tables, the
other gets a fault for an already-split page table.
Is that handled here somehow?
> + /* Get the page level from the RMP entry. */
> + e = snp_lookup_page_in_rmptable(pfn_to_page(pfn), &rmp_level);
> + if (!e)
> + return RMP_FAULT_KILL;
The snp_lookup_page_in_rmptable() failure cases looks WARN-worthly.
Either you're doing a lookup for something not *IN* the RMP table, or
you don't support SEV-SNP, in which case you shouldn't be in this code
in the first place.
> + /*
> + * Check if the RMP violation is due to the guest private page access.
> + * We can not resolve this RMP fault, ask to kill the guest.
> + */
> + if (rmpentry_assigned(e))
> + return RMP_FAULT_KILL;
No "We's", please. Speak in imperative voice.
> + /*
> + * The backing page level is higher than the RMP page level, request
> + * to split the page.
> + */
> + if (level > rmp_level)
> + return RMP_FAULT_PAGE_SPLIT;
This can theoretically trigger on a hugetlbfs page. Right?
I thought I asked about this before... more below...
> + return RMP_FAULT_RETRY;
> +}
> +
> /*
> * Handle faults in the user portion of the address space. Nothing in here
> * should check X86_PF_USER without a specific justification: for almost
> @@ -1298,6 +1350,7 @@ void do_user_addr_fault(struct pt_regs *regs,
> struct task_struct *tsk;
> struct mm_struct *mm;
> vm_fault_t fault;
> + int ret;
> unsigned int flags = FAULT_FLAG_DEFAULT;
>
> tsk = current;
> @@ -1378,6 +1431,22 @@ void
(struct pt_regs *regs,
> if (error_code & X86_PF_INSTR)
> flags |= FAULT_FLAG_INSTRUCTION;
>
> + /*
> + * If its an RMP violation, try resolving it.
> + */
> + if (error_code & X86_PF_RMP) {
> + ret = handle_user_rmp_page_fault(error_code, address);
> + if (ret == RMP_FAULT_PAGE_SPLIT) {
> + flags |= FAULT_FLAG_PAGE_SPLIT;
> + } else if (ret == RMP_FAULT_KILL) {
> + fault |= VM_FAULT_SIGBUS;
> + do_sigbus(regs, error_code, address, fault);
> + return;
> + } else {
> + return;
> + }
> + }
Why not just have handle_user_rmp_page_fault() return a VM_FAULT_* code
directly?
I also suspect you can just set VM_FAULT_SIGBUS and let the do_sigbus()
call later on in the function do its work.
> * Faults in the vsyscall page might need emulation. The
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 322ec61d0da7..211dfe5d3b1d 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -450,6 +450,8 @@ extern pgprot_t protection_map[16];
> * @FAULT_FLAG_REMOTE: The fault is not for current task/mm.
> * @FAULT_FLAG_INSTRUCTION: The fault was during an instruction fetch.
> * @FAULT_FLAG_INTERRUPTIBLE: The fault can be interrupted by non-fatal signals.
> + * @FAULT_FLAG_PAGE_SPLIT: The fault was due page size mismatch, split the
> + * region to smaller page size and retry.
> *
> * About @FAULT_FLAG_ALLOW_RETRY and @FAULT_FLAG_TRIED: we can specify
> * whether we would allow page faults to retry by specifying these two
> @@ -481,6 +483,7 @@ enum fault_flag {
> FAULT_FLAG_REMOTE = 1 << 7,
> FAULT_FLAG_INSTRUCTION = 1 << 8,
> FAULT_FLAG_INTERRUPTIBLE = 1 << 9,
> + FAULT_FLAG_PAGE_SPLIT = 1 << 10,
> };
>
> /*
> @@ -520,7 +523,8 @@ static inline bool fault_flag_allow_retry_first(enum fault_flag flags)
> { FAULT_FLAG_USER, "USER" }, \
> { FAULT_FLAG_REMOTE, "REMOTE" }, \
> { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" }, \
> - { FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" }
> + { FAULT_FLAG_INTERRUPTIBLE, "INTERRUPTIBLE" }, \
> + { FAULT_FLAG_PAGE_SPLIT, "PAGESPLIT" }
>
> /*
> * vm_fault is filled by the pagefault handler and passed to the vma's
> diff --git a/mm/memory.c b/mm/memory.c
> index 730daa00952b..aef261d94e33 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -4407,6 +4407,15 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf)
> return 0;
> }
>
> +static int handle_split_page_fault(struct vm_fault *vmf)
> +{
> + if (!IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT))
> + return VM_FAULT_SIGBUS;
> +
> + __split_huge_pmd(vmf->vma, vmf->pmd, vmf->address, false, NULL);
> + return 0;
> +}
What will this do when you hand it a hugetlbfs page?
next prev parent reply other threads:[~2021-07-08 16:22 UTC|newest]
Thread overview: 178+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 18:35 [PATCH Part2 RFC v4 00/40] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 01/40] KVM: SVM: Add support to handle AP reset MSR protocol Brijesh Singh
2021-07-14 20:17 ` Sean Christopherson
2021-07-15 7:39 ` Joerg Roedel
2021-07-15 13:42 ` Tom Lendacky
2021-07-15 15:45 ` Sean Christopherson
2021-07-15 17:05 ` Tom Lendacky
2021-07-07 18:35 ` [PATCH Part2 RFC v4 02/40] KVM: SVM: Provide the Hypervisor Feature support VMGEXIT Brijesh Singh
2021-07-14 20:37 ` Sean Christopherson
2021-07-14 21:00 ` Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 03/40] x86/cpufeatures: Add SEV-SNP CPU feature Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 04/40] x86/sev: Add the host SEV-SNP initialization support Brijesh Singh
2021-07-14 21:07 ` Sean Christopherson
2021-07-14 22:02 ` Brijesh Singh
2021-07-14 22:06 ` Sean Christopherson
2021-07-14 22:11 ` Brijesh Singh
2022-06-02 11:47 ` Jarkko Sakkinen
2022-06-06 11:42 ` Dr. David Alan Gilbert
2021-07-07 18:35 ` [PATCH Part2 RFC v4 05/40] x86/sev: Add RMP entry lookup helpers Brijesh Singh
2021-07-15 18:37 ` Sean Christopherson
2021-07-15 19:28 ` Brijesh Singh
2021-07-16 17:22 ` Brijesh Singh
2021-07-20 22:06 ` Sean Christopherson
2021-07-20 23:10 ` Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 06/40] x86/sev: Add helper functions for RMPUPDATE and PSMASH instruction Brijesh Singh
2021-07-12 18:44 ` Peter Gonda
2021-07-12 19:00 ` Dave Hansen
2021-07-15 18:56 ` Sean Christopherson
2021-07-15 19:08 ` Dave Hansen
2021-07-15 19:18 ` Sean Christopherson
2021-07-07 18:35 ` [PATCH Part2 RFC v4 07/40] x86/sev: Split the physmap when adding the page in RMP table Brijesh Singh
2021-07-14 22:25 ` Sean Christopherson
2021-07-15 17:05 ` Brijesh Singh
2021-07-15 17:51 ` Sean Christopherson
2021-07-15 18:14 ` Brijesh Singh
2021-07-15 18:39 ` Sean Christopherson
2021-07-15 19:38 ` Brijesh Singh
2021-07-15 22:01 ` Sean Christopherson
2021-07-15 22:11 ` Brijesh Singh
2021-07-30 11:31 ` Vlastimil Babka
2021-07-30 16:10 ` Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 08/40] x86/traps: Define RMP violation #PF error code Brijesh Singh
2021-07-15 19:02 ` Sean Christopherson
2021-07-15 19:16 ` Dave Hansen
2021-07-07 18:35 ` [PATCH Part2 RFC v4 09/40] x86/fault: Add support to dump RMP entry on fault Brijesh Singh
2021-07-07 19:21 ` Dave Hansen
2021-07-08 15:02 ` Brijesh Singh
2021-07-08 15:30 ` Dave Hansen
2021-07-08 16:48 ` Brijesh Singh
2021-07-08 16:58 ` Dave Hansen
2021-07-08 17:11 ` Brijesh Singh
2021-07-08 17:15 ` Dave Hansen
2021-07-07 18:35 ` [PATCH Part2 RFC v4 10/40] x86/fault: Add support to handle the RMP fault for user address Brijesh Singh
2021-07-08 16:16 ` Dave Hansen [this message]
2021-07-12 15:43 ` Brijesh Singh
2021-07-12 16:00 ` Dave Hansen
2021-07-12 16:11 ` Brijesh Singh
2021-07-12 16:15 ` Dave Hansen
2021-07-12 16:24 ` Brijesh Singh
2021-07-12 16:29 ` Dave Hansen
2021-07-12 16:49 ` Brijesh Singh
2021-07-15 21:53 ` Sean Christopherson
2021-07-30 16:00 ` Vlastimil Babka
2021-07-30 16:31 ` Dave Hansen
2021-07-07 18:35 ` [PATCH Part2 RFC v4 11/40] crypto:ccp: Define the SEV-SNP commands Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 12/40] crypto: ccp: Add support to initialize the AMD-SP for SEV-SNP Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 13/40] crypto: ccp: Shutdown SNP firmware on kexec Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 14/40] crypto:ccp: Provide APIs to issue SEV-SNP commands Brijesh Singh
2021-07-08 18:56 ` Dr. David Alan Gilbert
2021-07-07 18:35 ` [PATCH Part2 RFC v4 15/40] crypto: ccp: Handle the legacy TMR allocation when SNP is enabled Brijesh Singh
2021-07-14 13:22 ` Marc Orr
2021-07-14 16:45 ` Brijesh Singh
2021-07-14 18:14 ` Marc Orr
2021-07-15 23:48 ` Sean Christopherson
2021-07-16 12:55 ` Brijesh Singh
2021-07-16 15:35 ` Sean Christopherson
2021-07-16 15:47 ` Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 16/40] crypto: ccp: Handle the legacy SEV command " Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 17/40] crypto: ccp: Add the SNP_PLATFORM_STATUS command Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 18/40] crypto: ccp: Add the SNP_{SET,GET}_EXT_CONFIG command Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 19/40] crypto: ccp: provide APIs to query extended attestation report Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 20/40] KVM: SVM: Make AVIC backing, VMSA and VMCB memory allocation SNP safe Brijesh Singh
2021-07-14 13:35 ` Marc Orr
2021-07-14 16:47 ` Brijesh Singh
2021-07-20 18:02 ` Sean Christopherson
2021-08-03 14:38 ` Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 21/40] KVM: SVM: Add initial SEV-SNP support Brijesh Singh
2021-07-16 18:00 ` Sean Christopherson
2021-07-16 18:46 ` Brijesh Singh
2021-07-16 19:31 ` Sean Christopherson
2021-07-16 21:03 ` Brijesh Singh
2021-07-07 18:35 ` [PATCH Part2 RFC v4 22/40] KVM: SVM: Add KVM_SNP_INIT command Brijesh Singh
2021-07-16 19:33 ` Sean Christopherson
2021-07-16 21:25 ` Brijesh Singh
2021-07-19 20:24 ` Sean Christopherson
2021-07-07 18:35 ` [PATCH Part2 RFC v4 23/40] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_START command Brijesh Singh
2021-07-12 18:45 ` Peter Gonda
2021-07-16 19:43 ` Sean Christopherson
2021-07-16 21:42 ` Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 24/40] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_UPDATE command Brijesh Singh
2021-07-16 20:01 ` Sean Christopherson
2021-07-16 22:00 ` Brijesh Singh
2021-07-19 20:51 ` Sean Christopherson
2021-07-19 21:34 ` Brijesh Singh
2021-07-19 21:36 ` Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 25/40] KVM: SVM: Reclaim the guest pages when SEV-SNP VM terminates Brijesh Singh
2021-07-16 20:09 ` Sean Christopherson
2021-07-16 22:16 ` Brijesh Singh
2021-07-17 0:46 ` Sean Christopherson
2021-07-19 12:55 ` Brijesh Singh
2021-07-19 17:18 ` Sean Christopherson
2021-07-19 18:34 ` Brijesh Singh
2021-07-19 19:03 ` Sean Christopherson
2021-07-19 19:14 ` Sean Christopherson
2021-07-19 19:37 ` Brijesh Singh
2021-07-20 16:40 ` Sean Christopherson
2021-07-20 18:23 ` Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 26/40] KVM: SVM: Add KVM_SEV_SNP_LAUNCH_FINISH command Brijesh Singh
2021-07-16 20:18 ` Sean Christopherson
2021-07-16 22:48 ` Brijesh Singh
2021-07-19 16:54 ` Sean Christopherson
2021-07-19 18:29 ` Brijesh Singh
2021-07-19 19:14 ` Sean Christopherson
2021-07-19 19:49 ` Brijesh Singh
2021-07-19 20:13 ` Sean Christopherson
2021-07-21 17:53 ` Marc Orr
2021-07-07 18:36 ` [PATCH Part2 RFC v4 27/40] KVM: X86: Add kvm_x86_ops to get the max page level for the TDP Brijesh Singh
2021-07-16 19:19 ` Sean Christopherson
2021-07-16 20:41 ` Brijesh Singh
2021-07-20 19:38 ` Sean Christopherson
2021-07-20 20:06 ` Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 28/40] KVM: X86: Introduce kvm_mmu_map_tdp_page() for use by SEV Brijesh Singh
2021-07-16 18:15 ` Sean Christopherson
2021-07-07 18:36 ` [PATCH Part2 RFC v4 29/40] KVM: X86: Introduce kvm_mmu_get_tdp_walk() for SEV-SNP use Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 30/40] KVM: X86: Define new RMP check related #NPF error bits Brijesh Singh
2021-07-16 20:22 ` Sean Christopherson
2021-07-17 0:34 ` Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 31/40] KVM: X86: update page-fault trace to log the 64-bit error code Brijesh Singh
2021-07-16 20:25 ` Sean Christopherson
2021-07-17 0:35 ` Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 32/40] KVM: SVM: Add support to handle GHCB GPA register VMGEXIT Brijesh Singh
2021-07-16 20:45 ` Sean Christopherson
2021-07-17 0:44 ` Brijesh Singh
2021-07-19 20:04 ` Sean Christopherson
2021-07-07 18:36 ` [PATCH Part2 RFC v4 33/40] KVM: SVM: Add support to handle MSR based Page State Change VMGEXIT Brijesh Singh
2021-07-16 21:00 ` Sean Christopherson
2021-07-19 14:19 ` Brijesh Singh
2021-07-19 18:55 ` Sean Christopherson
2021-07-19 19:15 ` Brijesh Singh
2021-08-13 16:32 ` Borislav Petkov
2021-07-07 18:36 ` [PATCH Part2 RFC v4 34/40] KVM: SVM: Add support to handle " Brijesh Singh
2021-07-16 21:14 ` Sean Christopherson
2021-07-19 14:24 ` Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 35/40] KVM: Add arch hooks to track the host write to guest memory Brijesh Singh
2021-07-19 23:30 ` Sean Christopherson
2021-07-20 15:15 ` Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 36/40] KVM: X86: Export the kvm_zap_gfn_range() for the SNP use Brijesh Singh
2021-07-07 18:36 ` [PATCH Part2 RFC v4 37/40] KVM: SVM: Add support to handle the RMP nested page fault Brijesh Singh
2021-07-20 0:10 ` Sean Christopherson
2021-07-20 17:55 ` Brijesh Singh
2021-07-20 22:31 ` Sean Christopherson
2021-07-20 23:53 ` Brijesh Singh
2021-07-21 20:15 ` Sean Christopherson
2021-07-07 18:36 ` [PATCH Part2 RFC v4 38/40] KVM: SVM: Provide support for SNP_GUEST_REQUEST NAE event Brijesh Singh
2021-07-19 22:50 ` Sean Christopherson
2021-07-20 14:37 ` Brijesh Singh
2021-07-20 16:28 ` Sean Christopherson
2021-07-20 18:21 ` Brijesh Singh
2021-07-20 22:09 ` Sean Christopherson
2021-07-07 18:36 ` [PATCH Part2 RFC v4 39/40] KVM: SVM: Use a VMSA physical address variable for populating VMCB Brijesh Singh
2021-07-21 0:20 ` Sean Christopherson
2021-07-21 16:26 ` Tom Lendacky
2021-07-07 18:36 ` [PATCH Part2 RFC v4 40/40] KVM: SVM: Support SEV-SNP AP Creation NAE event Brijesh Singh
2021-07-21 0:01 ` Sean Christopherson
2021-07-21 17:47 ` Tom Lendacky
2021-07-21 19:52 ` Sean Christopherson
2021-08-20 14:44 ` Tom Lendacky
2021-07-08 15:40 ` [PATCH Part2 RFC v4 00/40] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support Dave Hansen
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