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hyperv-fixes for 6.7-rc3

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Merge tag 'hyperv-fixes-signed-20231121' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

Pull hyperv fixes from Wei Liu:

 - One fix for the KVP daemon (Ani Sinha)

 - Fix for the detection of E820_TYPE_PRAM in a Gen2 VM (Saurabh Sengar)

 - Micro-optimization for hv_nmi_unknown() (Uros Bizjak)

* tag 'hyperv-fixes-signed-20231121' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  x86/hyperv: Use atomic_try_cmpxchg() to micro-optimize hv_nmi_unknown()
  x86/hyperv: Fix the detection of E820_TYPE_PRAM in a Gen2 VM
  hv/hv_kvp_daemon: Some small fixes for handling NM keyfiles
This commit is contained in:
Linus Torvalds 2023-11-22 09:56:26 -08:00
commit 05c8c94ed4
4 changed files with 39 additions and 15 deletions
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25
arch/x86/hyperv/hv_init.c
View File

@ -15,6 +15,7 @@
#include <linux/io.h>
#include <asm/apic.h>
#include <asm/desc.h>
#include <asm/e820/api.h>
#include <asm/sev.h>
#include <asm/ibt.h>
#include <asm/hypervisor.h>
@ -286,15 +287,31 @@ static int hv_cpu_die(unsigned int cpu)
static int __init hv_pci_init(void)
{
int gen2vm = efi_enabled(EFI_BOOT);
bool gen2vm = efi_enabled(EFI_BOOT);
/*
* For Generation-2 VM, we exit from pci_arch_init() by returning 0.
* The purpose is to suppress the harmless warning:
* A Generation-2 VM doesn't support legacy PCI/PCIe, so both
* raw_pci_ops and raw_pci_ext_ops are NULL, and pci_subsys_init() ->
* pcibios_init() doesn't call pcibios_resource_survey() ->
* e820__reserve_resources_late(); as a result, any emulated persistent
* memory of E820_TYPE_PRAM (12) via the kernel parameter
* memmap=nn[KMG]!ss is not added into iomem_resource and hence can't be
* detected by register_e820_pmem(). Fix this by directly calling
* e820__reserve_resources_late() here: e820__reserve_resources_late()
* depends on e820__reserve_resources(), which has been called earlier
* from setup_arch(). Note: e820__reserve_resources_late() also adds
* any memory of E820_TYPE_PMEM (7) into iomem_resource, and
* acpi_nfit_register_region() -> acpi_nfit_insert_resource() ->
* region_intersects() returns REGION_INTERSECTS, so the memory of
* E820_TYPE_PMEM won't get added twice.
*
* We return 0 here so that pci_arch_init() won't print the warning:
* "PCI: Fatal: No config space access function found"
*/
if (gen2vm)
if (gen2vm) {
e820__reserve_resources_late();
return 0;
}
/* For Generation-1 VM, we'll proceed in pci_arch_init(). */
return 1;

5
arch/x86/kernel/cpu/mshyperv.c
View File

@ -262,11 +262,14 @@ static uint32_t __init ms_hyperv_platform(void)
static int hv_nmi_unknown(unsigned int val, struct pt_regs *regs)
{
static atomic_t nmi_cpu = ATOMIC_INIT(-1);
unsigned int old_cpu, this_cpu;
if (!unknown_nmi_panic)
return NMI_DONE;
if (atomic_cmpxchg(&nmi_cpu, -1, raw_smp_processor_id()) != -1)
old_cpu = -1;
this_cpu = raw_smp_processor_id();
if (!atomic_try_cmpxchg(&nmi_cpu, &old_cpu, this_cpu))
return NMI_HANDLED;
return NMI_DONE;

20
tools/hv/hv_kvp_daemon.c
View File

@ -1421,7 +1421,7 @@ static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
if (error)
goto setval_error;
if (new_val->addr_family == ADDR_FAMILY_IPV6) {
if (new_val->addr_family & ADDR_FAMILY_IPV6) {
error = fprintf(nmfile, "\n[ipv6]\n");
if (error < 0)
goto setval_error;
@ -1455,14 +1455,18 @@ static int kvp_set_ip_info(char *if_name, struct hv_kvp_ipaddr_value *new_val)
if (error < 0)
goto setval_error;
error = fprintf(nmfile, "gateway=%s\n", (char *)new_val->gate_way);
if (error < 0)
goto setval_error;
error = fprintf(nmfile, "dns=%s\n", (char *)new_val->dns_addr);
if (error < 0)
goto setval_error;
/* we do not want ipv4 addresses in ipv6 section and vice versa */
if (is_ipv6 != is_ipv4((char *)new_val->gate_way)) {
error = fprintf(nmfile, "gateway=%s\n", (char *)new_val->gate_way);
if (error < 0)
goto setval_error;
}
if (is_ipv6 != is_ipv4((char *)new_val->dns_addr)) {
error = fprintf(nmfile, "dns=%s\n", (char *)new_val->dns_addr);
if (error < 0)
goto setval_error;
}
fclose(nmfile);
fclose(ifcfg_file);

4
tools/hv/hv_set_ifconfig.sh
View File

@ -53,7 +53,7 @@
# or "manual" if no boot-time protocol should be used)
#
# address1=ipaddr1/plen
# address=ipaddr2/plen
# address2=ipaddr2/plen
#
# gateway=gateway1;gateway2
#
@ -61,7 +61,7 @@
#
# [ipv6]
# address1=ipaddr1/plen
# address2=ipaddr1/plen
# address2=ipaddr2/plen
#
# gateway=gateway1;gateway2
#