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KVM: SVM: Add a helper to convert a SME-aware PA back to a struct page

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Add __sme_pa_to_page() to pair with __sme_page_pa() and use it to replace
open coded equivalents, including for "iopm_base", which previously
avoided having to do __sme_clr() by storing the raw PA in the global
variable.

Opportunistically convert __sme_page_pa() to a helper to provide type
safety.

No functional change intended.

Link: https://lore.kernel.org/r/20240802204511.352017-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-08-02 13:45:09 -07:00
parent c501062bb2
commit 48547fe75e
2 changed files with 19 additions and 6 deletions
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9
arch/x86/kvm/svm/svm.c
View File

@ -1124,8 +1124,7 @@ static void svm_hardware_unsetup(void)
for_each_possible_cpu(cpu)
svm_cpu_uninit(cpu);
__free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT),
get_order(IOPM_SIZE));
__free_pages(__sme_pa_to_page(iopm_base), get_order(IOPM_SIZE));
iopm_base = 0;
}
@ -1301,7 +1300,7 @@ static void init_vmcb(struct kvm_vcpu *vcpu)
if (!kvm_hlt_in_guest(vcpu->kvm))
svm_set_intercept(svm, INTERCEPT_HLT);
control->iopm_base_pa = __sme_set(iopm_base);
control->iopm_base_pa = iopm_base;
control->msrpm_base_pa = __sme_set(__pa(svm->msrpm));
control->int_ctl = V_INTR_MASKING_MASK;
@ -1503,7 +1502,7 @@ static void svm_vcpu_free(struct kvm_vcpu *vcpu)
sev_free_vcpu(vcpu);
__free_page(pfn_to_page(__sme_clr(svm->vmcb01.pa) >> PAGE_SHIFT));
__free_page(__sme_pa_to_page(svm->vmcb01.pa));
__free_pages(virt_to_page(svm->msrpm), get_order(MSRPM_SIZE));
}
@ -5251,7 +5250,7 @@ static __init int svm_hardware_setup(void)
iopm_va = page_address(iopm_pages);
memset(iopm_va, 0xff, PAGE_SIZE * (1 << order));
iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;
iopm_base = __sme_page_pa(iopm_pages);
init_msrpm_offsets();

16
arch/x86/kvm/svm/svm.h
View File

@ -25,7 +25,21 @@
#include "cpuid.h"
#include "kvm_cache_regs.h"
#define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT)
/*
* Helpers to convert to/from physical addresses for pages whose address is
* consumed directly by hardware. Even though it's a physical address, SVM
* often restricts the address to the natural width, hence 'unsigned long'
* instead of 'hpa_t'.
*/
static inline unsigned long __sme_page_pa(struct page *page)
{
return __sme_set(page_to_pfn(page) << PAGE_SHIFT);
}
static inline struct page *__sme_pa_to_page(unsigned long pa)
{
return pfn_to_page(__sme_clr(pa) >> PAGE_SHIFT);
}
#define IOPM_SIZE PAGE_SIZE * 3
#define MSRPM_SIZE PAGE_SIZE * 2