From: Brijesh Singh <brijesh.singh@amd.com>
To: simon.guinot@sequanux.org, linux-efi@vger.kernel.org,
brijesh.singh@amd.com, kvm@vger.kernel.org, rkrcmar@redhat.com,
matt@codeblueprint.co.uk, linux-pci@vger.kernel.org,
linus.walleij@linaro.org, gary.hook@amd.com, linux-mm@kvack.org,
paul.gortmaker@windriver.com, hpa@zytor.com, cl@linux.com,
dan.j.williams@intel.com, aarcange@redhat.com,
sfr@canb.auug.org.au, andriy.shevchenko@linux.intel.com,
herbert@gondor.apana.org.au, bhe@redhat.com, xemul@parallels.com,
joro@8bytes.org, x86@kernel.org, peterz@infradead.org,
piotr.luc@intel.com, mingo@redhat.com, msalter@redhat.com,
ross.zwisler@linux.intel.com, bp@suse.de, dyoung@redhat.com,
thomas.lendacky@amd.com, jroedel@suse.de, keescook@chromium.org,
arnd@arndb.de, toshi.kani@hpe.com,
mathieu.desnoyers@efficios.com, luto@kernel.org,
devel@linuxdriverproject.org, bhelgaas@google.com,
tglx@linutronix.de, mchehab@kernel.org, iamjoonsoo.kim@lge.com,
labbott@fedoraproject.org, tony.luck@intel.com,
alexandre.bounine@idt.com, kuleshovmail@gmail.com,
linux-kernel@vger.kernel.org, mcgrof@kernel.org, mst@redhat.com,
linux-crypto@vger.kernel.org, tj@kernel.org, pbonzini@redhat.com,
akpm@linux-foundation.org, davem@davemloft.net
Subject: [RFC PATCH v2 25/32] kvm: svm: Add support for SEV LAUNCH_START command
Date: Thu, 2 Mar 2017 10:17:35 -0500 [thread overview]
Message-ID: <148846785574.2349.2756610033917941226.stgit@brijesh-build-machine> (raw)
In-Reply-To: <148846752022.2349.13667498174822419498.stgit@brijesh-build-machine>
The command is used to bootstrap SEV guest from unencrypted boot images.
The command creates a new VM encryption key (VEK) using the guest owner's
public DH certificates, and session data. The VEK will be used to encrypt
the guest memory.
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
arch/x86/kvm/svm.c | 302 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 301 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index fb63398..b5fa8c0 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -37,6 +37,7 @@
#include <linux/amd-iommu.h>
#include <linux/hashtable.h>
#include <linux/psp-sev.h>
+#include <linux/file.h>
#include <asm/apic.h>
#include <asm/perf_event.h>
@@ -497,6 +498,10 @@ static inline bool gif_set(struct vcpu_svm *svm)
/* Secure Encrypted Virtualization */
static unsigned int max_sev_asid;
static unsigned long *sev_asid_bitmap;
+static void sev_deactivate_handle(struct kvm *kvm);
+static void sev_decommission_handle(struct kvm *kvm);
+static int sev_asid_new(void);
+static void sev_asid_free(int asid);
static bool kvm_sev_enabled(void)
{
@@ -1534,6 +1539,17 @@ static inline int avic_free_vm_id(int id)
return 0;
}
+static void sev_vm_destroy(struct kvm *kvm)
+{
+ if (!sev_guest(kvm))
+ return;
+
+ /* release the firmware resources */
+ sev_deactivate_handle(kvm);
+ sev_decommission_handle(kvm);
+ sev_asid_free(sev_get_asid(kvm));
+}
+
static void avic_vm_destroy(struct kvm *kvm)
{
unsigned long flags;
@@ -1551,6 +1567,12 @@ static void avic_vm_destroy(struct kvm *kvm)
spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
}
+static void svm_vm_destroy(struct kvm *kvm)
+{
+ avic_vm_destroy(kvm);
+ sev_vm_destroy(kvm);
+}
+
static int avic_vm_init(struct kvm *kvm)
{
unsigned long flags;
@@ -5502,6 +5524,282 @@ static inline void avic_post_state_restore(struct kvm_vcpu *vcpu)
avic_handle_ldr_update(vcpu);
}
+static int sev_asid_new(void)
+{
+ int pos;
+
+ if (!max_sev_asid)
+ return -EINVAL;
+
+ pos = find_first_zero_bit(sev_asid_bitmap, max_sev_asid);
+ if (pos >= max_sev_asid)
+ return -EBUSY;
+
+ set_bit(pos, sev_asid_bitmap);
+ return pos + 1;
+}
+
+static void sev_asid_free(int asid)
+{
+ int cpu, pos;
+ struct svm_cpu_data *sd;
+
+ pos = asid - 1;
+ clear_bit(pos, sev_asid_bitmap);
+
+ for_each_possible_cpu(cpu) {
+ sd = per_cpu(svm_data, cpu);
+ sd->sev_vmcbs[pos] = NULL;
+ }
+}
+
+static int sev_issue_cmd(struct kvm *kvm, int id, void *data, int *error)
+{
+ int ret;
+ struct fd f;
+ int fd = sev_get_fd(kvm);
+
+ f = fdget(fd);
+ if (!f.file)
+ return -EBADF;
+
+ ret = sev_issue_cmd_external_user(f.file, id, data, 0, error);
+ fdput(f);
+
+ return ret;
+}
+
+static void sev_decommission_handle(struct kvm *kvm)
+{
+ int ret, error;
+ struct sev_data_decommission *data;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return;
+
+ data->handle = sev_get_handle(kvm);
+ ret = sev_guest_decommission(data, &error);
+ if (ret)
+ pr_err("SEV: DECOMMISSION %d (%#x)\n", ret, error);
+
+ kfree(data);
+}
+
+static void sev_deactivate_handle(struct kvm *kvm)
+{
+ int ret, error;
+ struct sev_data_deactivate *data;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return;
+
+ data->handle = sev_get_handle(kvm);
+ ret = sev_guest_deactivate(data, &error);
+ if (ret) {
+ pr_err("SEV: DEACTIVATE %d (%#x)\n", ret, error);
+ goto buffer_free;
+ }
+
+ wbinvd_on_all_cpus();
+
+ ret = sev_guest_df_flush(&error);
+ if (ret)
+ pr_err("SEV: DF_FLUSH %d (%#x)\n", ret, error);
+
+buffer_free:
+ kfree(data);
+}
+
+static int sev_activate_asid(unsigned int handle, int asid, int *error)
+{
+ int ret;
+ struct sev_data_activate *data;
+
+ wbinvd_on_all_cpus();
+
+ ret = sev_guest_df_flush(error);
+ if (ret) {
+ pr_err("SEV: DF_FLUSH %d (%#x)\n", ret, *error);
+ return ret;
+ }
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->handle = handle;
+ data->asid = asid;
+ ret = sev_guest_activate(data, error);
+ if (ret)
+ pr_err("SEV: ACTIVATE %d (%#x)\n", ret, *error);
+
+ kfree(data);
+ return ret;
+}
+
+static int sev_pre_start(struct kvm *kvm, int *asid)
+{
+ int ret;
+
+ /* If guest has active SEV handle then deactivate before creating the
+ * encryption context.
+ */
+ if (sev_guest(kvm)) {
+ sev_deactivate_handle(kvm);
+ sev_decommission_handle(kvm);
+ *asid = sev_get_asid(kvm); /* reuse the asid */
+ ret = 0;
+ } else {
+ /* Allocate new asid for this launch */
+ ret = sev_asid_new();
+ if (ret < 0) {
+ pr_err("SEV: failed to get free asid\n");
+ return ret;
+ }
+ *asid = ret;
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static int sev_post_start(struct kvm *kvm, int asid, int handle,
+ int sev_fd, int *error)
+{
+ int ret;
+
+ /* activate asid */
+ ret = sev_activate_asid(handle, asid, error);
+ if (ret)
+ return ret;
+
+ kvm->arch.sev_info.handle = handle;
+ kvm->arch.sev_info.asid = asid;
+ kvm->arch.sev_info.sev_fd = sev_fd;
+
+ return 0;
+}
+
+static int sev_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
+{
+ int ret, asid = 0;
+ void *dh_cert_addr = NULL;
+ void *session_addr = NULL;
+ struct kvm_sev_launch_start params;
+ struct sev_data_launch_start *start;
+ int *error = &argp->error;
+ struct fd f;
+
+ f = fdget(argp->sev_fd);
+ if (!f.file)
+ return -EBADF;
+
+ /* Get parameter from the user */
+ ret = -EFAULT;
+ if (copy_from_user(¶ms, (void *)argp->data,
+ sizeof(struct kvm_sev_launch_start)))
+ goto err_1;
+
+ ret = -ENOMEM;
+ start = kzalloc(sizeof(*start), GFP_KERNEL);
+ if (!start)
+ goto err_1;
+
+ ret = sev_pre_start(kvm, &asid);
+ if (ret)
+ goto err_2;
+
+ start->handle = params.handle;
+ start->policy = params.policy;
+
+ /* Copy DH certificate from userspace */
+ if (params.dh_cert_length && params.dh_cert_data) {
+ dh_cert_addr = kmalloc(params.dh_cert_length, GFP_KERNEL);
+ if (!dh_cert_addr) {
+ ret = -EFAULT;
+ goto err_3;
+ }
+ if (copy_from_user(dh_cert_addr, (void *)params.dh_cert_data,
+ params.dh_cert_length)) {
+ ret = -EFAULT;
+ goto err_3;
+ }
+
+ start->dh_cert_address = __psp_pa(dh_cert_addr);
+ start->dh_cert_length = params.dh_cert_length;
+ }
+
+ /* Copy session data from userspace */
+ if (params.session_length && params.session_data) {
+ session_addr = kmalloc(params.dh_cert_length, GFP_KERNEL);
+ if (!session_addr) {
+ ret = -EFAULT;
+ goto err_3;
+ }
+ if (copy_from_user(session_addr, (void *)params.session_data,
+ params.session_length)) {
+ ret = -EFAULT;
+ goto err_3;
+ }
+ start->session_data_address = __psp_pa(session_addr);
+ start->session_data_length = params.session_length;
+ }
+
+ /* launch start */
+ ret = sev_issue_cmd_external_user(f.file, SEV_CMD_LAUNCH_START,
+ start, 0, error);
+ if (ret) {
+ pr_err("SEV: LAUNCH_START ret=%d (%#010x)\n", ret, *error);
+ goto err_3;
+ }
+
+ ret = sev_post_start(kvm, asid, start->handle, argp->sev_fd, error);
+ if (ret)
+ goto err_3;
+
+ params.handle = start->handle;
+ if (copy_to_user((void *) argp->data, ¶ms,
+ sizeof(struct kvm_sev_launch_start)))
+ ret = -EFAULT;
+err_3:
+ if (ret && asid) /* free asid if we have encountered error */
+ sev_asid_free(asid);
+ kfree(dh_cert_addr);
+ kfree(session_addr);
+err_2:
+ kfree(start);
+err_1:
+ fdput(f);
+ return ret;
+}
+
+static int amd_memory_encryption_cmd(struct kvm *kvm, void __user *argp)
+{
+ int r = -ENOTTY;
+ struct kvm_sev_cmd sev_cmd;
+
+ if (copy_from_user(&sev_cmd, argp, sizeof(struct kvm_sev_cmd)))
+ return -EFAULT;
+
+ mutex_lock(&kvm->lock);
+
+ switch (sev_cmd.id) {
+ case KVM_SEV_LAUNCH_START: {
+ r = sev_launch_start(kvm, &sev_cmd);
+ break;
+ }
+ default:
+ break;
+ }
+
+ mutex_unlock(&kvm->lock);
+ if (copy_to_user(argp, &sev_cmd, sizeof(struct kvm_sev_cmd)))
+ r = -EFAULT;
+ return r;
+}
+
static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.cpu_has_kvm_support = has_svm,
.disabled_by_bios = is_disabled,
@@ -5518,7 +5816,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.vcpu_reset = svm_vcpu_reset,
.vm_init = avic_vm_init,
- .vm_destroy = avic_vm_destroy,
+ .vm_destroy = svm_vm_destroy,
.prepare_guest_switch = svm_prepare_guest_switch,
.vcpu_load = svm_vcpu_load,
@@ -5617,6 +5915,8 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.pmu_ops = &amd_pmu_ops,
.deliver_posted_interrupt = svm_deliver_avic_intr,
.update_pi_irte = svm_update_pi_irte,
+
+ .memory_encryption_op = amd_memory_encryption_cmd,
};
static int __init svm_init(void)
--
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next prev parent reply other threads:[~2017-03-02 15:17 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-02 15:12 [RFC PATCH v2 00/32] x86: Secure Encrypted Virtualization (AMD) Brijesh Singh
2017-03-02 15:12 ` [RFC PATCH v2 01/32] x86: Add the Secure Encrypted Virtualization CPU feature Brijesh Singh
2017-03-03 16:59 ` Borislav Petkov
2017-03-03 21:01 ` Brijesh Singh
2017-03-04 10:11 ` Borislav Petkov
2017-03-06 18:11 ` Brijesh Singh
2017-03-06 20:54 ` Borislav Petkov
2017-03-02 15:12 ` [RFC PATCH v2 02/32] x86: Secure Encrypted Virtualization (SEV) support Brijesh Singh
2017-03-07 11:19 ` Borislav Petkov
2017-03-08 15:06 ` Borislav Petkov
2017-03-02 15:12 ` [RFC PATCH v2 03/32] KVM: SVM: prepare for new bit definition in nested_ctl Brijesh Singh
2017-03-02 15:12 ` [RFC PATCH v2 04/32] KVM: SVM: Add SEV feature definitions to KVM Brijesh Singh
2017-03-07 0:50 ` Borislav Petkov
2017-03-02 15:12 ` [RFC PATCH v2 05/32] x86: Use encrypted access of BOOT related data with SEV Brijesh Singh
2017-03-07 11:09 ` Borislav Petkov
2017-03-16 19:03 ` Tom Lendacky
2017-03-02 15:13 ` [RFC PATCH v2 06/32] x86/pci: Use memremap when walking setup data Brijesh Singh
2017-03-03 20:42 ` Bjorn Helgaas
2017-03-03 21:15 ` Tom Lendacky
2017-03-07 0:03 ` Bjorn Helgaas
2017-03-13 20:08 ` Tom Lendacky
2017-03-02 15:13 ` [RFC PATCH v2 07/32] x86/efi: Access EFI data as encrypted when SEV is active Brijesh Singh
2017-03-07 11:57 ` Borislav Petkov
2017-03-02 15:13 ` [RFC PATCH v2 08/32] x86: Use PAGE_KERNEL protection for ioremap of memory page Brijesh Singh
2017-03-07 14:59 ` Borislav Petkov
2017-03-16 20:04 ` Tom Lendacky
2017-03-17 14:32 ` Tom Lendacky
2017-03-17 14:55 ` Tom Lendacky
2017-03-02 15:13 ` [RFC PATCH v2 09/32] x86: Change early_ioremap to early_memremap for BOOT data Brijesh Singh
2017-03-08 8:46 ` Borislav Petkov
2017-03-02 15:14 ` [RFC PATCH v2 10/32] x86: DMA support for SEV memory encryption Brijesh Singh
2017-03-08 10:56 ` Borislav Petkov
2017-03-02 15:14 ` [RFC PATCH v2 11/32] x86: Unroll string I/O when SEV is active Brijesh Singh
2017-03-02 15:14 ` [RFC PATCH v2 12/32] x86: Add early boot support when running with SEV active Brijesh Singh
2017-03-09 14:07 ` Borislav Petkov
2017-03-09 16:13 ` Paolo Bonzini
2017-03-09 16:29 ` Borislav Petkov
2017-03-10 16:35 ` Brijesh Singh
2017-03-16 10:16 ` Borislav Petkov
2017-03-16 14:28 ` Tom Lendacky
2017-03-16 15:09 ` Borislav Petkov
2017-03-16 16:11 ` Tom Lendacky
2017-03-16 16:29 ` Borislav Petkov
2017-03-02 15:15 ` [RFC PATCH v2 13/32] KVM: SVM: Enable SEV by setting the SEV_ENABLE CPU feature Brijesh Singh
2017-03-09 19:29 ` Borislav Petkov
2017-03-02 15:15 ` [RFC PATCH v2 14/32] x86: mm: Provide support to use memblock when spliting large pages Brijesh Singh
2017-03-10 11:06 ` Borislav Petkov
2017-03-10 22:41 ` Brijesh Singh
2017-03-16 13:15 ` Paolo Bonzini
2017-03-16 18:28 ` Borislav Petkov
2017-03-16 22:25 ` Paolo Bonzini
2017-03-17 10:17 ` Borislav Petkov
2017-03-17 10:47 ` Paolo Bonzini
2017-03-17 10:56 ` Borislav Petkov
2017-03-17 11:03 ` Paolo Bonzini
2017-03-17 11:33 ` Borislav Petkov
2017-03-17 14:45 ` Paolo Bonzini
2017-03-18 16:37 ` Borislav Petkov
2017-04-06 14:05 ` Brijesh Singh
2017-04-06 17:25 ` Borislav Petkov
2017-04-06 18:37 ` Brijesh Singh
2017-04-07 11:33 ` Borislav Petkov
2017-04-07 14:50 ` Brijesh Singh
2017-03-16 12:28 ` Paolo Bonzini
2017-03-02 15:15 ` [RFC PATCH v2 15/32] x86: Add support for changing memory encryption attribute in early boot Brijesh Singh
2017-03-24 17:12 ` Borislav Petkov
2017-03-27 15:07 ` Brijesh Singh
2017-03-02 15:15 ` [RFC PATCH v2 16/32] x86: kvm: Provide support to create Guest and HV shared per-CPU variables Brijesh Singh
2017-03-16 11:06 ` Paolo Bonzini
2017-03-28 18:39 ` Borislav Petkov
2017-03-29 15:21 ` Paolo Bonzini
2017-03-29 15:32 ` Borislav Petkov
2017-03-02 15:15 ` [RFC PATCH v2 17/32] x86: kvmclock: Clear encryption attribute when SEV is active Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 18/32] kvm: svm: Use the hardware provided GPA instead of page walk Brijesh Singh
2017-03-29 15:14 ` Borislav Petkov
2017-03-29 17:08 ` Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 19/32] crypto: ccp: Introduce the AMD Secure Processor device Brijesh Singh
2017-03-02 17:39 ` Mark Rutland
2017-03-02 19:11 ` Brijesh Singh
2017-03-03 13:55 ` Andy Shevchenko
2017-03-02 15:16 ` [RFC PATCH v2 20/32] crypto: ccp: Add Platform Security Processor (PSP) interface support Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 21/32] crypto: ccp: Add Secure Encrypted Virtualization (SEV) " Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 22/32] kvm: svm: prepare to reserve asid for SEV guest Brijesh Singh
2017-03-02 15:17 ` [RFC PATCH v2 23/32] kvm: introduce KVM_MEMORY_ENCRYPT_OP ioctl Brijesh Singh
2017-03-16 10:25 ` Paolo Bonzini
2017-03-02 15:17 ` [RFC PATCH v2 24/32] kvm: x86: prepare for SEV guest management API support Brijesh Singh
2017-03-16 10:33 ` Paolo Bonzini
2017-03-02 15:17 ` Brijesh Singh [this message]
2017-03-02 15:17 ` [RFC PATCH v2 26/32] kvm: svm: Add support for SEV LAUNCH_UPDATE_DATA command Brijesh Singh
2017-03-16 10:48 ` Paolo Bonzini
2017-03-16 18:20 ` Brijesh Singh
2017-03-02 15:17 ` [RFC PATCH v2 27/32] kvm: svm: Add support for SEV LAUNCH_FINISH command Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 28/32] kvm: svm: Add support for SEV GUEST_STATUS command Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 29/32] kvm: svm: Add support for SEV DEBUG_DECRYPT command Brijesh Singh
2017-03-16 10:54 ` Paolo Bonzini
2017-03-16 18:41 ` Brijesh Singh
2017-03-17 11:09 ` Paolo Bonzini
2017-03-02 15:18 ` [RFC PATCH v2 30/32] kvm: svm: Add support for SEV DEBUG_ENCRYPT command Brijesh Singh
2017-03-16 11:03 ` Paolo Bonzini
2017-03-16 18:34 ` Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 31/32] kvm: svm: Add support for SEV LAUNCH_MEASURE command Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 32/32] x86: kvm: Pin the guest memory when SEV is active Brijesh Singh
2017-03-16 10:38 ` Paolo Bonzini
2017-03-16 18:17 ` Brijesh Singh
2017-03-03 20:33 ` [RFC PATCH v2 00/32] x86: Secure Encrypted Virtualization (AMD) Bjorn Helgaas
2017-03-03 20:51 ` Borislav Petkov
2017-03-03 21:15 ` Brijesh Singh
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