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KVM SVM changes for 6.14:

Browse Source 
- Macrofy the SEV=n version of the sev_xxx_guest() helpers so that the code is
    optimized away when building with less than brilliant compilers.
 
  - Remove a now-redundant TLB flush when guest CR4.PGE changes.
 
  - Use str_enabled_disabled() to replace open coded strings.
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Merge tag 'kvm-x86-svm-6.14' of https://github.com/kvm-x86/linux into HEAD

KVM SVM changes for 6.14:

 - Macrofy the SEV=n version of the sev_xxx_guest() helpers so that the code is
   optimized away when building with less than brilliant compilers.

 - Remove a now-redundant TLB flush when guest CR4.PGE changes.

 - Use str_enabled_disabled() to replace open coded strings.
This commit is contained in:
Paolo Bonzini 2025-01-20 06:48:35 -05:00
commit 672162a0d3
3 changed files with 10 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kvm/svm/sev.c
View File

@ -3051,11 +3051,11 @@ void __init sev_hardware_setup(void)
min_sev_asid, max_sev_asid);
if (boot_cpu_has(X86_FEATURE_SEV_ES))
pr_info("SEV-ES %s (ASIDs %u - %u)\n",
sev_es_supported ? "enabled" : "disabled",
str_enabled_disabled(sev_es_supported),
min_sev_asid > 1 ? 1 : 0, min_sev_asid - 1);
if (boot_cpu_has(X86_FEATURE_SEV_SNP))
pr_info("SEV-SNP %s (ASIDs %u - %u)\n",
sev_snp_supported ? "enabled" : "disabled",
str_enabled_disabled(sev_snp_supported),
min_sev_asid > 1 ? 1 : 0, min_sev_asid - 1);
sev_enabled = sev_supported;

8
arch/x86/kvm/svm/svm.c
View File

@ -28,6 +28,7 @@
#include <linux/rwsem.h>
#include <linux/cc_platform.h>
#include <linux/smp.h>
#include <linux/string_choices.h>
#include <asm/apic.h>
#include <asm/perf_event.h>
@ -284,8 +285,6 @@ u32 svm_msrpm_offset(u32 msr)
return MSR_INVALID;
}
static void svm_flush_tlb_current(struct kvm_vcpu *vcpu);
static int get_npt_level(void)
{
#ifdef CONFIG_X86_64
@ -1921,9 +1920,6 @@ void svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
unsigned long old_cr4 = vcpu->arch.cr4;
if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
svm_flush_tlb_current(vcpu);
vcpu->arch.cr4 = cr4;
if (!npt_enabled) {
cr4 |= X86_CR4_PAE;
@ -5328,7 +5324,7 @@ static __init int svm_hardware_setup(void)
/* Force VM NPT level equal to the host's paging level */
kvm_configure_mmu(npt_enabled, get_npt_level(),
get_npt_level(), PG_LEVEL_1G);
pr_info("Nested Paging %sabled\n", npt_enabled ? "en" : "dis");
pr_info("Nested Paging %s\n", str_enabled_disabled(npt_enabled));
/* Setup shadow_me_value and shadow_me_mask */
kvm_mmu_set_me_spte_mask(sme_me_mask, sme_me_mask);

19
arch/x86/kvm/svm/svm.h
View File

@ -358,39 +358,32 @@ static __always_inline struct kvm_sev_info *to_kvm_sev_info(struct kvm *kvm)
return &to_kvm_svm(kvm)->sev_info;
}
#ifdef CONFIG_KVM_AMD_SEV
static __always_inline bool sev_guest(struct kvm *kvm)
{
#ifdef CONFIG_KVM_AMD_SEV
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
return sev->active;
#else
return false;
#endif
}
static __always_inline bool sev_es_guest(struct kvm *kvm)
{
#ifdef CONFIG_KVM_AMD_SEV
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
return sev->es_active && !WARN_ON_ONCE(!sev->active);
#else
return false;
#endif
}
static __always_inline bool sev_snp_guest(struct kvm *kvm)
{
#ifdef CONFIG_KVM_AMD_SEV
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
return (sev->vmsa_features & SVM_SEV_FEAT_SNP_ACTIVE) &&
!WARN_ON_ONCE(!sev_es_guest(kvm));
#else
return false;
#endif
}
#else
#define sev_guest(kvm) false
#define sev_es_guest(kvm) false
#define sev_snp_guest(kvm) false
#endif
static inline bool ghcb_gpa_is_registered(struct vcpu_svm *svm, u64 val)
{